CN103546110B - A kind of Attenuation control voltage determines method, device and alc circuit - Google Patents
A kind of Attenuation control voltage determines method, device and alc circuit Download PDFInfo
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Abstract
The invention discloses a kind of Attenuation control voltage and determine method, device and alc circuit, including: when the sampling period arrives, the voltage signal exporting the detecting circuit in alc circuit is sampled, and obtains the sampled voltage of current sample period；And this sampled voltage of based on current sample period and the power voltage in a upper sampling period, determine the power voltage of current sample period；And according to default power voltage and Attenuation control voltage synopsis, determine the Attenuation control voltage corresponding with the power voltage of current sample period, Attenuation control voltage as current sample period, for before determining the Attenuation control voltage in next sampling period, control the attenuation parameter of rf attenuation circuit in alc circuit.The scheme using the embodiment of the present invention to provide, improves the alc circuit power control effect to the output signal of power amplification device.
Description
Technical field
The present invention relates to the radio frequency arts in communication technical field, particularly relate to one and can be applicable to time slot
The Attenuation control voltage of signal communications determines method, device and alc circuit.
Background technology
In a wireless communication system, generally use power amplifier that the signal in transmission is carried out power amplification,
The power level enough to ensure signal, extends signal cover.The signal received is entered by power amplifier
During the operation of row power amplification, when the over proof output of the output of power amplifier, can lead
The number of writing serious distortion affects communication quality, even damage equipment.For this problem, typically can put at power
Big equipment adds can the control of limiting power amplifier peak power output, protection circuit, this circuit quilt
It is referred to as auto level control (Automatic Level Control, ALC) circuit.
After applying alc circuit in power amplification device, when the output of power amplifier exceedes specified
After value, the signal of power amplifier output can be processed by alc circuit, and signal process obtained
Feed back to the input of power amplification device, make power amplification device can adjust according to the signal of this feedback and decline
Subtract parameter, the power attenuation amount of the signal of input is controlled, thus adjust input to power amplifier
The power of signal, and then the maximum signal power of limiting power amplifier output.It is said that in general, when power is put
After big equipment reaches the predetermined level of alc circuit to the level of the output signal after input signal amplification, as
Really the power of input signal is further added by, and alc circuit then carries out the decay of corresponding power, in order to keep output letter
Number power stability one expect power, this expectation power can be referred to as ALC power.
In actual applications, can stablize according to the signal demand of the actual characteristic of power amplifier and output
ALC power, control attenuation parameter change.
Fig. 1 show the structural representation of the power amplification device with alc circuit, and this circuit can be right
The power of continuous signal is amplified, it is also possible to be amplified the power of time slot signal.
Including alc circuit 11 and power amplification circuit 12, alc circuit 11 includes rf attenuation electricity
Road 111, coupling circuit 112, detecting circuit 113 and integrating amplification circuit 114.
Need the radiofrequency signal processed through power amplification device, the one of rf attenuation circuit 111 will be imported into
Individual input, another input of rf attenuation circuit 111, by integrating amplification circuit 114 input attenuation
Control signal, rf attenuation circuit 111 determines attenuation parameter according to the voltage of the attenuation control signal of input,
And use the attenuation parameter determined that this radiofrequency signal of input carries out attenuation processing, radio frequency after then decaying
Signal exports to power amplification circuit 12.
Power amplification circuit 12 carries out power amplification process to radiofrequency signal after the decay of input, is amplified
Rear radiofrequency signal, after amplification, radiofrequency signal can carry out defeated as radiofrequency signal after the process of power amplification device
Go out, at the same time it can also be radiofrequency signal after this amplification is exported to coupling circuit 112.
Radiofrequency signal after this amplification is coupled by coupling circuit 112, radio frequency letter after the coupling that then will obtain
Number output to detecting circuit 113.
Detecting circuit 113 carries out power samples to radiofrequency signal after coupling, obtains the voltage signal quantified, and
It is input to an input of integrating amplification circuit 114.Detecting circuit 113 is to radiofrequency signal sampling after coupling
The performance number obtained has relation one to one, the merit that sampling obtains with the magnitude of voltage of the voltage signal of output
Rate value is the biggest, and the magnitude of voltage of the voltage signal of output is the biggest.
One end of integrating amplification circuit 114 is transfused to this voltage signal of detecting circuit 113 output, the other end
It is transfused to reference voltage signal, for comparing with this voltage signal, and both voltage differences is carried out
Amplify, be amplified rear magnitude of voltage, then voltage after rf attenuation circuit 111 output voltage is this amplification
The attenuation control signal of value.
Understanding based on above-mentioned alc circuit 11, the power of power amplification circuit 12 output signal is the biggest, penetrates
Frequently the attenuation parameter of attenuator circuit 111 is the biggest, in order to pending to input radio frequency attenuator circuit 111
Radiofrequency signal carries out effective attenuation, thus meets the requirement of stable output signal power.
But, above-mentioned alc circuit applies in general to carry out continuous signal the application of power amplification, for
The time slot signal that time slot signal, especially peak-to-average force ratio are higher, such as WLAN (WLAN, Wireless
Local Area Networks) signal, owing to the power of this signal different time-gap may differ by relatively big, cause
The voltage amplitude of the voltage signal of the quantization of detecting circuit output also changes greatly, thus causes integration to amplify electricity
The voltage amplitude of the attenuation control signal of road output also changes greatly, and then causes the decay of rf attenuation circuit
Parameter changes greatly at short notice to declining of the pending radiofrequency signal of input power multiplying arrangement
Subtract degree to undergo mutation, cause power amplifier error vector magnitude (EVM, ErrorVectorMagnitude) index
Deteriorate rapidly, finally make alc circuit to the power control effect of the output signal of power amplification device relatively
Difference, while affecting equipment communication quality, even damage equipment.
Summary of the invention
The embodiment of the present invention provides a kind of Attenuation control voltage to determine method, device and alc circuit, in order to
Solve the alc circuit power control effect to the output signal of power amplification device present in prior art
Poor problem.
The embodiment of the present invention provides a kind of Attenuation control voltage to determine method, including:
When the sampling period arrives, the voltage that the detecting circuit in auto level control alc circuit is exported
Signal is sampled, and obtains the sampled voltage of described current sample period；
Described sampled voltage based on described current sample period and the power voltage in a upper sampling period, determine
The power voltage of described current sample period, wherein, the power voltage of described current sample period is more than described
The minima of the power voltage in sampled voltage and a described upper sampling period, and the most described sampled voltage and
The maximum of the power voltage in a described upper sampling period, and compare described sampled voltage closer to described upper one
The power voltage in sampling period；
According to default power voltage and Attenuation control voltage synopsis, determine and described current sample period
The Attenuation control voltage that power voltage is corresponding, as the Attenuation control voltage of described current sample period, is used for
Before determining the Attenuation control voltage in next sampling period, the radio frequency controlled in described alc circuit declines
The attenuation parameter on powered down road.
The embodiment of the present invention also provides for a kind of Attenuation control voltage and determines device, including:
Voltage sampling unit, for when the sampling period arrives, in auto level control alc circuit
The voltage signal of detecting circuit output is sampled, and obtains the sampled voltage of described current sample period；
First voltage determination unit, adopts for described sampled voltage based on described current sample period and upper
The power voltage in sample cycle, determines the power voltage of described current sample period, wherein, described present sample
The power voltage in cycle was more than described sampled voltage and the minima of the power voltage in a described upper sampling period,
And the most described sampled voltage and the maximum of the power voltage in a described upper sampling period, and compared described
Sampled voltage is closer to the power voltage in a described upper sampling period；
Second voltage determination unit, the power voltage preset for basis and Attenuation control voltage synopsis, really
The fixed Attenuation control voltage corresponding with the power voltage of described current sample period, as described present sample week
The Attenuation control voltage of phase, for before determining the Attenuation control voltage in next sampling period, controls institute
State the attenuation parameter of rf attenuation circuit in alc circuit.
The embodiment of the present invention also provides for a kind of auto level control alc circuit, including: rf attenuation circuit,
Coupling circuit, detecting circuit and signal processing unit, wherein:
Described rf attenuation circuit, for the attenuation control signal exported according to described signal processing unit, really
Determine attenuation parameter, and use described attenuation parameter that the pending radiofrequency signal of input is carried out attenuation processing, and
After the decay that will obtain, radiofrequency signal exports and carries out power amplification process to power amplification circuit；
Described coupling circuit, for radiofrequency signal after the amplification of described power amplification circuit processing and amplifying
Couple, and after the coupling that will obtain, radiofrequency signal exports to detecting circuit；
Described detecting circuit, for radiofrequency signal after described coupling is carried out power samples, obtains the electricity quantified
Pressure signal, and export to described signal processing unit；
Described signal processing unit, is used for when the sampling period arrives, the voltage exporting described detecting circuit
Signal is sampled, and obtains the sampled voltage of described current sample period；And based on described current sample period
Described sampled voltage and the power voltage in a upper sampling period, determine described current sample period power electricity
Pressure, wherein, the power voltage of described current sample period is more than described sampled voltage and a described upper sampling week
The minima of the power voltage of phase, and the power electricity in the most described sampled voltage and a described upper sampling period
The maximum of pressure, and compared the described sampled voltage power voltage closer to a described upper sampling period；And
According to default power voltage and Attenuation control voltage synopsis, determine and the power of described current sample period
The Attenuation control voltage that voltage is corresponding, as the Attenuation control voltage of described current sample period, and to described
Rf attenuation circuit output voltage is the attenuation control signal of described Attenuation control voltage, under determining
Before the Attenuation control voltage in one sampling period, control the attenuation parameter of described rf attenuation circuit.
Beneficial effect of the present invention includes:
In the method that the embodiment of the present invention provides, the voltage signal that the detecting circuit in alc circuit is exported
Periodic sampling will be carried out, be then based on sampled voltage and the power in the upper sampling period electricity of current sample period
Pressure, determines the power voltage of current sample period, and the power voltage of the current sample period determined is more than being somebody's turn to do
The minima of the power voltage in sampled voltage and a upper sampling period, and be not more than this sampled voltage and upper adopt
The maximum of the power voltage in sample cycle, and compared this sampled voltage power electricity closer to a upper sampling period
Pressure so that according to default power voltage and Attenuation control voltage synopsis, determined by with currently adopt
The Attenuation control voltage that the power voltage in sample cycle is corresponding, was affected more by the power voltage in a upper sampling period
Greatly, thus when the voltage amplitude short time of the voltage signal of detecting circuit output changes greatly, determined by
The voltage amplitude of Attenuation control voltage will not change greatly, and then the radio frequency in alc circuit is declined
The attenuation parameter on powered down road will not change greatly, it is to avoid the pending radiofrequency signal to input power multiplying arrangement
Attenuation degree undergo mutation, improve the alc circuit power control to the output signal of power amplification device
Effect processed.
Other features and advantage will illustrate in the following description, and, partly from explanation
Book becomes apparent, or understands by implementing the application.The purpose of the application and other advantages can
Realize by structure specifically noted in the description write, claims and accompanying drawing and obtain
?.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with this
Bright embodiment is used for explaining the present invention together, is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the power amplification device in prior art with alc circuit；
Fig. 2 determines the flow chart of method for the Attenuation control voltage that the embodiment of the present invention provides；
Fig. 3 determines the detail flowchart of method for the Attenuation control voltage that the embodiment of the present invention provides；
Fig. 4 A, Fig. 4 B and Fig. 4 C determine in method for the Attenuation control voltage that the embodiment of the present invention provides and adopt
The schematic diagram of sample voltage, power voltage and Attenuation control voltage；
Fig. 5 determines the structural representation of device for the Attenuation control voltage that the embodiment of the present invention provides；
The structural representation of the alc circuit that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
In order to provide the raising alc circuit reality to the power control effect of the output signal of power amplification device
Existing scheme, embodiments provides a kind of Attenuation control voltage and determines method, device and alc circuit,
Below in conjunction with Figure of description, the preferred embodiments of the present invention are illustrated, it will be appreciated that described herein
Preferred embodiment be merely to illustrate and explain the present invention, be not intended to limit the present invention.And do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
The embodiment of the present invention provides a kind of Attenuation control voltage to determine method, as in figure 2 it is shown, include:
Step 201, when the sampling period arrives, in alc circuit detecting circuit export voltage signal
Sample, obtain the sampled voltage of current sample period.
Step 202, this sampled voltage based on current sample period and the power voltage in a upper sampling period,
Determining the power voltage of current sample period, wherein, the power voltage of current sample period is more than this sampling electricity
The minima of the power voltage in pressure and a upper sampling period, and it was not more than this sampled voltage and a upper sampling period
The maximum of power voltage, and compared this sampled voltage power electricity closer to a described upper sampling period
Pressure.
Step 203, according to power voltage and the Attenuation control voltage synopsis preset, determine and present sample
The Attenuation control voltage that the power voltage in cycle is corresponding, as the Attenuation control voltage of current sample period, uses
In before determining the Attenuation control voltage in next sampling period, control the rf attenuation in alc circuit
The attenuation parameter of circuit.
In the above-mentioned steps 202 of the embodiment of the present invention, this sampled voltage based on current sample period and upper one
The power voltage in sampling period, determines the power voltage of current sample period, is specifically as follows employing following public
Formula determines the power voltage of current sample period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of current sample period, Un-1For the power voltage in a upper sampling period, Xn
For this sampled voltage of current sample period, k is positive integer constant, and such as, k can be 47.
Further, before using above-mentioned formula to determine the power voltage of current sample period, can first sentence
Whether this sampled voltage of disconnected current sample period is not less than is preset sampled voltage threshold value, if it is not, then
Above-mentioned formula is used to determine the power voltage of current sample period, if less than then determining current sample period
Power voltage was the power voltage in a upper sampling period.Wherein, presetting sampled voltage threshold value can be according to reality
Needs are arranged flexibly, e.g. setting it to a less value, when less than this default sampled voltage
During threshold value, can represent in current sample period, power amplification device does not has power to export, when power is put
When the input signal of big equipment is time slot signal, it is also possible to represent in current sample period, this time slot signal
Current time slots be free timeslot, now determine that the power voltage of current sample period was a upper sampling period
Power voltage is constant, it is possible to reduce the sampled voltage the obtained during free timeslot impact on power voltage, in order to
Slow down the variation tendency of the power voltage of current sample period.
Below in conjunction with the accompanying drawings, the method provided the present invention with specific embodiment is described in detail.
Fig. 3 determines the detail flowchart of method for a kind of Attenuation control voltage that the embodiment of the present invention provides, tool
Body includes processing as follows step:
Step 301, after alc circuit powers on operation, determine that the radio frequency controlled in alc circuit first declines
The Attenuation control voltage that the attenuation parameter on powered down road is used is first to preset Attenuation control voltage, and this is first pre-
If Attenuation control voltage is maximum attenuation parameter for controlling the attenuation parameter of rf attenuation circuit, so that
After alc circuit powers on operation, it is possible to use input power multiplying arrangement is waited to locate by maximum attenuation parameter
Reason radiofrequency signal carries out attenuation processing, in order to the power preventing pending radiofrequency signal is excessive, damages power and puts
Big device.
V0 as shown in FIG. 4 C, is first and presets Attenuation control voltage.
Step 302, based on the sampling period, the voltage signal exporting the detecting circuit in alc circuit is carried out
Sampling, obtains the sampled voltage of current sample period.
X1-X12 as shown in Figure 4 A, respectively the 1st sampling period is to the 12nd sampling period
Sampled voltage.
Step 303, determine the sampled voltage of current sample period whether less than presetting sampled voltage threshold value, as
Fruit is not less than, and enters step 304, if it is lower, enter step 305.
Step 304, equation below is used to determine the power voltage of current sample period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of current sample period, Un-1For the power voltage in a upper sampling period, Xn
For the sampled voltage of current sample period, k is positive integer constant, such as k value 47.
In the embodiment of the present invention, the power voltage in the 1st sampling period, can be with the 1st sampling period
Sampled voltage is equal, it is also possible to using a predetermined power voltage as the power voltage in a upper sampling period, adopted
The power voltage in the 1st sampling period is determined with above-mentioned formula.
Step 305, the sampled voltage of current sample period are less than when presetting sampled voltage threshold value, determine current
The power voltage in sampling period was the power voltage in a upper sampling period.
U1-U12 as shown in Figure 4 B, respectively the 1st sampling period is to the 12nd sampling period
Power voltage, wherein, U2-U3, U5-U8 and U11-U12, determined by above-mentioned steps 304,
U4 and U9-U10, is determined by above-mentioned steps 305.
Step 306, determine the power voltage of current sample period whether more than predetermined power voltage threshold, as
Fruit is more than, and enters step 307, if it is not greater, enter step 308.
Step 307, according to power voltage and the Attenuation control voltage synopsis preset, determine and present sample
The Attenuation control voltage that the power voltage in cycle is corresponding, as the Attenuation control voltage of current sample period.
Wherein, this power voltage preset and Attenuation control voltage synopsis, can be according to alc circuit
Power controls to need, and the self attributes of power amplification device intermediate power amplifier, by reality test into
Row is arranged so that the Attenuation control voltage corresponding with power voltage determined based on this synopsis, it is possible to control
Rf attenuation circuit processed uses corresponding attenuation parameter that pending radiofrequency signal carries out attenuation processing, and meets
After decay, the power stability of radiofrequency signal output signal after power amplification processes expects power at one
On, this expectation power can be referred to as ALC power.
Power voltage in synopsis can be arranged, if cannot be straight in this synopsis for step footpath according to 1dB
Connect the power voltage inquiring current sample period, can by synopsis with the power of current sample period electricity
Press the Attenuation control voltage that immediate power voltage is corresponding, be defined as the power voltage with current sample period
Corresponding Attenuation control voltage, it is also possible to according in synopsis more than and closest to and less than and closest to current
Two power voltages of the power voltage in sampling period, and respectively corresponding Attenuation control voltage, determine with
The Attenuation control voltage that the power voltage of current sample period is corresponding, for example with equation below:
Wherein, UkAnd Uk-1For in this synopsis more than and closest to and less than and closest to current sample period
Power voltage UnTwo power voltages, VkAnd Vk-1It is respectively in synopsis and UkAnd Uk-1Corresponding declines
Down control voltage, VnFor the power voltage U with current sample periodnCorresponding Attenuation control voltage.
When step 308, the power voltage of current sample period are not more than this predetermined power voltage threshold, determine
The Attenuation control voltage of current sample period is second to preset Attenuation control voltage, and second presets adjustable attenuation electricity
Pressure is minimal attenuation parameter for controlling the attenuation parameter of rf attenuation circuit, uses this minimal attenuation parameter can
To ensure that rf attenuation circuit carries out minimal attenuation to pending radiofrequency signal.
This predetermined power voltage threshold in above-mentioned steps 306-step 308 can be carried out according to actual needs
Arranging flexibly, it may also be referred to as ALC and starts to control voltage, i.e. starts to control voltage when power voltage more than this ALC
Time just trigger alc circuit rf attenuation circuit by input pending radiofrequency signal carry out at decay
Reason, to reach the purpose that ALC power controls.
V1-V12 as shown in FIG. 4 C, respectively the 1st sampling period is to the 12nd sampling period
Attenuation control voltage, wherein, V1-V5, V7 and V11-V12, determined by above-mentioned steps 307,
V6 and V8-V10, is second to preset Attenuation control voltage by what above-mentioned steps 308 determined.
By the Attenuation control voltage of current sample period determined by above-mentioned steps 307 and step 308, use
In before determining the Attenuation control voltage in next sampling period, control the rf attenuation in alc circuit
The attenuation parameter of circuit, specifically can be by being this Attenuation control voltage to rf attenuation circuit input voltage
Attenuation control signal, pending radiofrequency signal is being declined by the rf attenuation circuit controlled in alc circuit
The attenuation parameter used when subtracting.
Further, it is also possible to Attenuation control voltage threshold value is set, i.e. when Attenuation control voltage is more than this decay
When controlling voltage threshold, rf attenuation circuit just triggers the attenuation processing to input radio frequency signal, otherwise, no
Trigger.
The above-mentioned Attenuation control voltage using the embodiment of the present invention to provide determines method, it is possible to make according to presetting
Power voltage and Attenuation control voltage synopsis, determined by corresponding with the power voltage of current sample period
Attenuation control voltage, affected bigger by the power voltage in a upper sampling period, thus when detecting circuit is defeated
When the voltage amplitude short time of the voltage signal gone out changes greatly, determined by the voltage amplitude of Attenuation control voltage
Degree will not change greatly, and then makes the attenuation parameter of the rf attenuation circuit in alc circuit will not
Change greatly, it is to avoid the attenuation degree of the pending radiofrequency signal of input power multiplying arrangement is undergone mutation,
Improve the alc circuit power control effect to the output signal of power amplification device, especially put when power
When big equipment is applied in the time slot signal communication system of high peak-to-average power ratio, it is possible to obtain more preferably power controls effect
Really.
Based on same inventive concept, the Attenuation control voltage side of determination provided according to the above embodiment of the present invention
Method, correspondingly, another embodiment of the present invention additionally provides a kind of Attenuation control voltage and determines device, its structure
Schematic diagram is as it is shown in figure 5, specifically include:
Voltage sampling unit 501, for when the sampling period arrives, in auto level control alc circuit
Detecting circuit output voltage signal sample, obtain the sampled voltage of described current sample period；
First voltage determination unit 502, for described sampled voltage based on described current sample period and
The power voltage in one sampling period, determines the power voltage of described current sample period, wherein, described currently
The power voltage in sampling period is more than described sampled voltage and the power voltage in a described upper sampling period
Little value, and the maximum of the power voltage in the most described sampled voltage and a described upper sampling period, and phase
Than described sampled voltage closer to the power voltage in a described upper sampling period；
Second voltage determination unit 503, the power voltage preset for basis and Attenuation control voltage synopsis,
Determine the Attenuation control voltage corresponding with the power voltage of described current sample period, as described present sample
The Attenuation control voltage in cycle, for before determining the Attenuation control voltage in next sampling period, controls
The attenuation parameter of the rf attenuation circuit in described alc circuit.
Further, the first voltage determination unit 502, specifically for use equation below determine described currently
The power voltage in sampling period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant.
Further, the first voltage determination unit 502, specifically for when described in described current sample period
Sampled voltage, not less than when presetting sampled voltage threshold value, uses equation below to determine described current sample period
Power voltage:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant；
When the described sampled voltage of described current sample period is less than when presetting sampled voltage threshold value, determine described
The power voltage of current sample period was the power voltage in a upper sampling period.
Further, the second voltage determination unit 503, it is additionally operable to after described alc circuit powers on operation,
Determine that it is first pre-for controlling the Attenuation control voltage that the attenuation parameter of described rf attenuation circuit used first
If Attenuation control voltage, described first presets Attenuation control voltage for controlling declining of described rf attenuation circuit
Subtracting parameter is maximum attenuation parameter.
Further, the second voltage determination unit 503, it is additionally operable to according to the power voltage preset and decay
Control voltage synopsis, determine the Attenuation control voltage corresponding with the power voltage of described current sample period it
Before, determine that the power voltage of described current sample period is more than predetermined power voltage threshold；And work as when described
When the power voltage in front sampling period is not more than described predetermined power voltage threshold, determine described present sample week
The Attenuation control voltage of phase is second to preset Attenuation control voltage, and described second presets Attenuation control voltage is used for
The attenuation parameter controlling described rf attenuation circuit is minimal attenuation parameter.
The function of above-mentioned each unit may correspond to the respective handling step in flow process shown in Fig. 2 or Fig. 3, at this
Repeat no more.
Based on same inventive concept, the Attenuation control voltage side of determination provided according to the above embodiment of the present invention
Method, correspondingly, another embodiment of the present invention additionally provides a kind of alc circuit, its structural representation such as Fig. 6
Shown in, specifically include: rf attenuation circuit 61, coupling circuit 62, detecting circuit 63 and signal processing list
Unit 64, wherein:
Described rf attenuation circuit 61, for the adjustable attenuation letter according to the output of described signal processing unit 64
Number, determine attenuation parameter, and use described attenuation parameter that the pending radiofrequency signal of input is carried out at decay
Reason, and after the decay that will obtain, radiofrequency signal exports and carries out power amplification process to power amplification circuit；
Described coupling circuit 62, for believing radio frequency after the amplification of described power amplification circuit processing and amplifying
Number couple, and after the coupling that will obtain, radiofrequency signal exports to detecting circuit 63；
Described detecting circuit 63, for radiofrequency signal after described coupling is carried out power samples, obtains quantization
Voltage signal, and export to described signal processing unit 64；
Described signal processing unit 64, for when the sampling period arrives, exports described detecting circuit 63
Voltage signal sample, obtain the sampled voltage of described current sample period；And currently adopt based on described
The described sampled voltage in sample cycle and the power voltage in a upper sampling period, determine described current sample period
Power voltage, wherein, the power voltage of described current sample period is more than described sampled voltage and described upper
The minima of the power voltage in sampling period, and the most described sampled voltage and a described upper sampling period
The maximum of power voltage, and compared the described sampled voltage power electricity closer to a described upper sampling period
Pressure；And according to default power voltage and Attenuation control voltage synopsis, determine and described present sample week
The Attenuation control voltage that the power voltage of phase is corresponding, as the Attenuation control voltage of described current sample period,
And to the attenuation control signal that described rf attenuation circuit 61 output voltage is described Attenuation control voltage, use
In before determining the Attenuation control voltage in next sampling period, control described rf attenuation circuit 61
Attenuation parameter.
Further, signal processing unit 64, specifically for using equation below to determine described present sample week
The power voltage of phase:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant.
Further, signal processing unit 64, specifically for when the described sampling electricity of described current sample period
Pressure, not less than when presetting sampled voltage threshold value, uses equation below to determine the power electricity of described current sample period
Pressure:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant；
When the described sampled voltage of described current sample period is less than when presetting sampled voltage threshold value, determine described
The power voltage of current sample period was the power voltage in a upper sampling period.
Further, signal processing unit 64, it is additionally operable to after described alc circuit powers on operation, to institute
Stating rf attenuation circuit output voltage is the first attenuation control signal presetting Attenuation control voltage, described
One preset Attenuation control voltage for control the attenuation parameter of described rf attenuation circuit 61 be maximum attenuation ginseng
Number.
Further, signal processing unit 64, it is additionally operable to according to the power voltage preset and adjustable attenuation electricity
Pressure synopsis, before determining the Attenuation control voltage corresponding with the power voltage of described current sample period, really
The power voltage of fixed described current sample period is more than predetermined power voltage threshold；And when described present sample
When the power voltage in cycle is not more than described predetermined power voltage threshold, determine declining of described current sample period
Down control voltage is second to preset Attenuation control voltage, and to described rf attenuation circuit 61 output voltage is
Described second attenuation control signal presetting Attenuation control voltage, described second presets Attenuation control voltage is used for
The attenuation parameter controlling described rf attenuation circuit 61 is minimal attenuation parameter.
The embodiment of the present invention also provides for a kind of frequency communication devices, including:
Above-mentioned alc circuit shown in Fig. 6.
The function of above-mentioned signal processing unit 64 may correspond to the respective handling in flow process shown in Fig. 2 or Fig. 3
Step, does not repeats them here, this signal processing unit 64 namely be equivalent to the decay control shown in above-mentioned Fig. 5
Voltage processed determines device, and the function of this signal processing unit 64 can be realized by software, it is also possible to passes through
Hardware circuit realizes.
In sum, the scheme that the embodiment of the present invention provides, including: when the sampling period arrives, to ALC
The voltage signal of the detecting circuit output in circuit is sampled, and obtains the sampled voltage of current sample period；
And this sampled voltage of based on current sample period and the power voltage in a upper sampling period, determine present sample
The power voltage in cycle, wherein, the power voltage of current sample period is more than this sampled voltage and a upper sampling
The minima of the power voltage in cycle, and it was not more than this sampled voltage and the power voltage in a upper sampling period
Maximum, and compared this sampled voltage power voltage closer to a described upper sampling period；And according in advance
If power voltage and Attenuation control voltage synopsis, determine corresponding with the power voltage of current sample period
Attenuation control voltage, as the Attenuation control voltage of current sample period, for determining next sampling week
Before the Attenuation control voltage of phase, the attenuation parameter of the rf attenuation circuit in control alc circuit.Use
The scheme that the embodiment of the present invention provides, improves the alc circuit merit to the output signal of power amplification device
Rate controls effect.
The Attenuation control voltage that embodiments herein is provided determines that device can be realized by computer program.
Those skilled in the art are it should be appreciated that above-mentioned Module Division mode is only in numerous Module Division mode
One, if being divided into other modules or not dividing module, as long as Attenuation control voltage determines that device has
Above-mentioned functions, all should be within the protection domain of the application.
The application is with reference to method, equipment (system) and the computer program product according to the embodiment of the present application
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (13)
1. an Attenuation control voltage determines method, it is characterised in that including:
When the sampling period arrives, the voltage that the detecting circuit in auto level control alc circuit is exported
Signal is sampled, and obtains the sampled voltage of current sample period；
Described sampled voltage based on described current sample period and the power voltage in a upper sampling period, determine
The power voltage of described current sample period, wherein, the power voltage of described current sample period is more than described
The minima of the power voltage in sampled voltage and a described upper sampling period, and the most described sampled voltage and
The maximum of the power voltage in a described upper sampling period, and compare described sampled voltage closer to described upper one
The power voltage in sampling period；
According to default power voltage and Attenuation control voltage synopsis, determine and described current sample period
The Attenuation control voltage that power voltage is corresponding, as the Attenuation control voltage of described current sample period, is used for
Before determining the Attenuation control voltage in next sampling period, the radio frequency controlled in described alc circuit declines
The attenuation parameter on powered down road；
Described sampled voltage based on described current sample period and the power voltage in a upper sampling period, determine
The power voltage of described current sample period, particularly as follows:
Equation below is used to determine the power voltage of described current sample period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant.
2. the method for claim 1, it is characterised in that institute based on described current sample period
State sampled voltage and the power voltage in a upper sampling period, and determine the power voltage of described current sample period,
Specifically include:
When the described sampled voltage of described current sample period is not less than when presetting sampled voltage threshold value, use such as
Lower formula determines the power voltage of described current sample period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant；
When the described sampled voltage of described current sample period is less than when presetting sampled voltage threshold value, determine described
The power voltage of current sample period was the power voltage in a upper sampling period.
3. method as claimed in claim 1 or 2, it is characterised in that also include:
After described alc circuit powers on operation, determine the decay ginseng controlling described rf attenuation circuit first
Several used Attenuation control voltage are first to preset Attenuation control voltage, and described first presets adjustable attenuation electricity
Pressure is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit.
4. method as claimed in claim 1 or 2, it is characterised in that according to the power voltage preset
With Attenuation control voltage synopsis, determine the adjustable attenuation corresponding with the power voltage of described current sample period
Before voltage, also include:
Determine that the power voltage of described current sample period is more than predetermined power voltage threshold；
When the power voltage of described current sample period is not more than described predetermined power voltage threshold, determine institute
Stating the Attenuation control voltage of current sample period is second to preset Attenuation control voltage, and described second presets decay
Controlling voltage for controlling the attenuation parameter of described rf attenuation circuit is minimal attenuation parameter.
5. an Attenuation control voltage determines device, it is characterised in that including:
Voltage sampling unit, for when the sampling period arrives, in auto level control alc circuit
The voltage signal of detecting circuit output is sampled, and obtains the sampled voltage of current sample period；
First voltage determination unit, adopts for described sampled voltage based on described current sample period and upper
The power voltage in sample cycle, determines the power voltage of described current sample period, wherein, described present sample
The power voltage in cycle was more than described sampled voltage and the minima of the power voltage in a described upper sampling period,
And the most described sampled voltage and the maximum of the power voltage in a described upper sampling period, and compared described
Sampled voltage is closer to the power voltage in a described upper sampling period；
Second voltage determination unit, the power voltage preset for basis and Attenuation control voltage synopsis, really
The fixed Attenuation control voltage corresponding with the power voltage of described current sample period, as described present sample week
The Attenuation control voltage of phase, for before determining the Attenuation control voltage in next sampling period, controls institute
State the attenuation parameter of rf attenuation circuit in alc circuit；
Described first voltage determination unit, specifically for using equation below to determine described current sample period
Power voltage:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant.
6. device as claimed in claim 5, it is characterised in that described first voltage determination unit, tool
Body is for when the described sampled voltage of described current sample period is not less than when presetting sampled voltage threshold value, using
Equation below determines the power voltage of described current sample period:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant；
When the described sampled voltage of described current sample period is less than when presetting sampled voltage threshold value, determine described
The power voltage of current sample period was the power voltage in a upper sampling period.
7. the device as described in claim 5 or 6, it is characterised in that described second voltage determination unit,
It is additionally operable to, after described alc circuit powers on operation, determine the decay controlling described rf attenuation circuit first
The Attenuation control voltage that parameter is used is first to preset Attenuation control voltage, and described first presets adjustable attenuation
Voltage is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit.
8. the device as described in claim 5 or 6, it is characterised in that described second voltage determination unit,
It is additionally operable to, according to the power voltage preset and Attenuation control voltage synopsis, determine and described present sample week
Before the Attenuation control voltage that the power voltage of phase is corresponding, determine that the power voltage of described current sample period is big
In predetermined power voltage threshold；And when the power voltage of described current sample period is not more than described default merit
During rate voltage threshold, determine that the Attenuation control voltage of described current sample period is second to preset adjustable attenuation electricity
Pressure, described second presets Attenuation control voltage for controlling the attenuation parameter of described rf attenuation circuit for minimum
Attenuation parameter.
9. an auto level control alc circuit, it is characterised in that including: rf attenuation circuit, coupling
Close circuit, detecting circuit and signal processing unit, wherein:
Described rf attenuation circuit, for the attenuation control signal exported according to described signal processing unit, really
Determine attenuation parameter, and use described attenuation parameter that the pending radiofrequency signal of input is carried out attenuation processing, and
After the decay that will obtain, radiofrequency signal exports and carries out power amplification process to power amplification circuit；
Described coupling circuit, for radiofrequency signal after the amplification of described power amplification circuit processing and amplifying
Couple, and after the coupling that will obtain, radiofrequency signal exports to detecting circuit；
Described detecting circuit, for radiofrequency signal after described coupling is carried out power samples, obtains the electricity quantified
Pressure signal, and export to described signal processing unit；
Described signal processing unit, is used for when the sampling period arrives, the voltage exporting described detecting circuit
Signal is sampled, and obtains the sampled voltage of current sample period；And institute of based on described current sample period
State sampled voltage and the power voltage in a upper sampling period, and determine the power voltage of described current sample period,
Wherein, the power voltage of described current sample period is more than described sampled voltage and a described upper sampling period
The minima of power voltage, and the power voltage in the most described sampled voltage and a described upper sampling period
Maximum, and compared the described sampled voltage power voltage closer to a described upper sampling period；And according to
The power voltage preset and Attenuation control voltage synopsis, determine and the power voltage of described current sample period
Corresponding Attenuation control voltage, as the Attenuation control voltage of described current sample period, and to described radio frequency
Attenuator circuit output voltage is the attenuation control signal of described Attenuation control voltage, for determining that next is adopted
Before the Attenuation control voltage in sample cycle, control the attenuation parameter of described rf attenuation circuit；
Described signal processing unit, specifically for using equation below to determine the power of described current sample period
Voltage:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant.
10. alc circuit as claimed in claim 9, it is characterised in that described signal processing unit,
Specifically for when the described sampled voltage of described current sample period is not less than when presetting sampled voltage threshold value, adopting
The power voltage of described current sample period is determined by equation below:
Un=(kUn-1+Xn)/(k+1)；
Wherein, UnFor the power voltage of described current sample period, Un-1Power electricity for a upper sampling period
Pressure, XnFor the described sampled voltage of described current sample period, k is positive integer constant；
When the described sampled voltage of described current sample period is less than when presetting sampled voltage threshold value, determine described
The power voltage of current sample period was the power voltage in a upper sampling period.
11. alc circuits as described in claim 9 or 10, it is characterised in that described signal processing list
Unit, is additionally operable to after described alc circuit powers on operation, is the to described rf attenuation circuit output voltage
One attenuation control signal presetting Attenuation control voltage, described first presets Attenuation control voltage for controlling
The attenuation parameter stating rf attenuation circuit is maximum attenuation parameter.
12. alc circuits as described in claim 9 or 10, it is characterised in that described signal processing list
Unit, is additionally operable to, according to the power voltage preset and Attenuation control voltage synopsis, determine and currently adopt with described
Before the Attenuation control voltage that the power voltage in sample cycle is corresponding, determine the power electricity of described current sample period
Pressure is more than predetermined power voltage threshold；And when the power voltage of described current sample period is not more than described pre-
If during power voltage threshold value, determine that the Attenuation control voltage of described current sample period is the second default decay control
Voltage processed, and be the described second decay presetting Attenuation control voltage to described rf attenuation circuit output voltage
Control signal, described second presets Attenuation control voltage for controlling the attenuation parameter of described rf attenuation circuit
For minimal attenuation parameter.
13. 1 kinds of frequency communication devices, it is characterised in that including:
Alc circuit as described in claim 9-12 is arbitrary.
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| CN201310469947.2A CN103546110B (en) | 2013-10-09 | 2013-10-09 | A kind of Attenuation control voltage determines method, device and alc circuit |
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| CN201310469947.2A CN103546110B (en) | 2013-10-09 | 2013-10-09 | A kind of Attenuation control voltage determines method, device and alc circuit |
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| CN107911091B (en) * | 2017-11-24 | 2021-09-24 | 京信网络系统股份有限公司 | Method and circuit for adjusting gain |
| CN110572224B (en) * | 2019-08-22 | 2022-03-15 | 三维通信股份有限公司 | Method, device, system and readable storage medium for reducing base station receiving background noise |
| CN114415778B (en) * | 2022-01-14 | 2023-06-27 | 中国电子科技集团公司第十研究所 | ALC loop parameter automatic debugging method |
| CN116539952B (en) * | 2023-07-05 | 2023-09-26 | 北京中成康富科技股份有限公司 | Millimeter wave therapeutic apparatus power intelligent sampling method and system based on Internet of things |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196806A (en) * | 1990-10-19 | 1993-03-23 | Nec Corporation | Output level control circuit for use in rf power amplifier |
| US20080232436A1 (en) * | 2007-03-21 | 2008-09-25 | Tzero Technologies, Inc. | Average power control of wireless transmission having a variable duty cycle |
| CN101461135A (en) * | 2006-04-03 | 2009-06-17 | 高通股份有限公司 | Method and system for automatic gain control with intelligent selection of signal samples |
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2013
- 2013-10-09 CN CN201310469947.2A patent/CN103546110B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196806A (en) * | 1990-10-19 | 1993-03-23 | Nec Corporation | Output level control circuit for use in rf power amplifier |
| CN101461135A (en) * | 2006-04-03 | 2009-06-17 | 高通股份有限公司 | Method and system for automatic gain control with intelligent selection of signal samples |
| US20080232436A1 (en) * | 2007-03-21 | 2008-09-25 | Tzero Technologies, Inc. | Average power control of wireless transmission having a variable duty cycle |
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