CN106657940A - Multistage frequency-conversion tuner - Google Patents
Multistage frequency-conversion tuner Download PDFInfo
- Publication number
- CN106657940A CN106657940A CN201611096785.2A CN201611096785A CN106657940A CN 106657940 A CN106657940 A CN 106657940A CN 201611096785 A CN201611096785 A CN 201611096785A CN 106657940 A CN106657940 A CN 106657940A
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- CN
- China
- Prior art keywords
- frequency
- multistage
- mixer
- signal
- low
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention discloses a multistage frequency-conversion tuner. The multistage frequency-conversion tuner comprises a low-noise amplifier, an intermediate frequency filter and a plurality of frequency mixers, wherein the low-noise amplifier is orderly connected with the plurality of frequency mixers; each frequency mixer is connected with a voltage-controlled oscillator; the tuner selects the frequency conversion number of times and the number and frequency of a corresponding local oscillation source according to the high-low of the input frequency; each frequency mixer is located behind the low-noise amplifier to directly process a radio frequency signal amplified by the low-noise amplifier; each frequency mixer further receives a local oscillation signal from the voltage-controlled oscillator, a circuit thereof completely works at a radio frequency band; the gain of an input signal can be controlled by use of the multistage frequency-mixing without using a frequency-mixing tube with high cost; the interference to an intermediate frequency signal from an IP3 component of an adjacent signal can be reduced through multi-stage frequency-mixing.
Description
Technical field
The present invention relates to tuner technical field, specially a kind of tuner of multistage frequency conversion.
Background technology
Satellite reception outdoor unit is the main accepting device of microwave communication, is commonly called as tuner.As relatively more normal on market
The product seen, is using single local oscillator, as local vibration source mostly.Even double local oscillators or many local oscillators, generally also for multiple frequencies
Section.Tuner is generally all, by single-conversion, and then to obtain receiving accordingly the frequency that can be received, and then realizes work(
Energy.But because the incoming frequency of microwave communication is higher, the flatness of output signal noise system is obtained by single-conversion
Number is all poor.
Scheme of the prior art is：Tuner includes cavity, circuit board and feed, and circuit board is arranged on cavity
It is interior, signal output connector is provided with one end cavity wall of cavity, feed connecting seat, feed connecting seat are provided with other end cavity wall
It is upper that the recessed probe cavity volume of oriented cavity bottom is set, probe is provided with probe cavity volume, probe is straight rod-shaped, and probe one end is
Free end, the other end is vertically fixed on cavity bottom and extends up to and is welded on the distributing point of circuit board in cavity
Together, feed is cylindrical cavity of the one end with conical head, and the front end of conical head is provided with adpting flange, and feed is by connection
Flange is connected on feed connecting seat so that in feed, its schematic diagram is as shown in Figure 2.
Its shortcoming is：Due to frequency input signal it is higher, by being once mixed the intermediate-freuqncy signal for obtaining, due to mixing
Device, and the restriction of the element such as power amplifier and circuit, the signal flatness for causing it to export, the index such as noise has been all very
Difference.
The content of the invention
For problem above, the invention provides a kind of tuner of multistage frequency conversion, solves the gain that Single Conversion brings
Flatness, can be with the problem in effectively solving background technology.
For achieving the above object, the present invention provides following technical scheme：A kind of tuner of multistage frequency conversion, including low noise
Amplifier, intermediate-frequency filter and some frequency mixers, the low-noise amplifier is sequentially connected some frequency mixers, and the frequency mixer is equal
One voltage controlled oscillator of connection, the tuner selects the number of times and corresponding local vibration source of frequency conversion according to the height of incoming frequency
Quantity and frequency, frequency mixer be located at low-noise amplifier after, directly process low-noise amplifier amplify after radio frequency believe
Number, frequency mixer also receives the local oscillation signal for carrying out voltage controlled oscillator, and its circuit is fully operational in radio frequency band.
Used as a kind of preferred scheme of the present invention, the frequency mixer passes through to adjust conversion gain, for making up intermediate frequency filtering
Contribution of the loss and reduction frequency mixer subsequent conditioning circuit noise of device to system noise.
Used as a kind of preferred scheme of the present invention, the frequency mixer can be entered using multistage mixing to the gain of input signal
Row control, the mixer tube without needing higher costs.
Used as a kind of preferred scheme of the present invention, there is cubic non-linearity item, the radio frequency letter of adjacent channel in the frequency mixer
Number third order intermodulation amount for causing can cause serious interference to IF output signal, by multistage mixing, it is possible to reduce adjacent letter
Number interference of the IP3 components to intermediate-freuqncy signal.
Compared with prior art, the invention has the beneficial effects as follows：
（1）The gain of input signal can be controlled using multistage mixing, the mixer tube without needing higher costs；
（2）When the signal frequency for needing frequency conversion is higher, cause local frequency higher, the local oscillation power of the input of needs is higher,
Cause the local oscillator insulated degree requirement of frequency mixer higher；
（3）The noise coefficient for selecting multistage mixing is far longer than using the noise coefficient that one-level is mixed according to cascading equations；
（4）Because frequency mixer has cubic non-linearity item, the third order intermodulation amount that the radiofrequency signal of adjacent channel is caused can be to intermediate frequency
Output signal causes serious interference, by multistage mixing, it is possible to reduce the IP3 components of adjacent signals are done to intermediate-freuqncy signal
Disturb.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the theory structure schematic diagram of prior art in background of invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment：
Fig. 1 is referred to, the present invention provides a kind of technical scheme：A kind of tuner of multistage frequency conversion, including low-noise amplifier, in
Frequency wave filter and some frequency mixers, the low-noise amplifier is sequentially connected some frequency mixers, and the frequency mixer is all connected with one
Voltage controlled oscillator, the tuner according to the height of incoming frequency, select the number of times of frequency conversion and the quantity of corresponding local vibration source with
And frequency, radiofrequency signal of the frequency mixer after low-noise amplifier, after directly process low-noise amplifier amplifies.
To realize mixing work(, frequency mixer also receives the local oscillation signal for carrying out voltage controlled oscillator, and its circuit is fully operational in radio frequency frequency
Section, therefore, the design of frequency mixer generally need consideration conversion gain, the isolation between the linearity, noise coefficient, port and
The performance indications such as power consumption.
（1）In order to make up the loss of intermediate-frequency filter, and reduce tribute of the frequency mixer subsequent conditioning circuit noise to system noise
Offer, frequency mixer needs certain conversion gain, but, gain can affect greatly very much the output of frequency mixer again；
（2）The linearity of frequency mixer is most important performance in properties, directly determines the dynamic range of receiver.Work as radio frequency
The power of input signal is excessive, more than frequency mixer 1dB compression points when, the power of IF output signal will have greatly than desired value
The decay of amplitude, deviates original linear track;Because frequency mixer has cubic non-linearity item, the radiofrequency signal of adjacent channel is made
Into third order intermodulation amount serious interference can be caused to IF output signal, generally characterize frequency mixer to three with IIP3 or OIP3
The rejection ability of rank intermodulation amount.
（3）In order to reduce system noise and mitigate the design pressure of low-noise amplifier, frequency mixer should have relatively low
Noise coefficient；
（4）The local oscillation signal amplitude of oscillation in frequency mixer generally than larger, easily cause signal feed-through and causes interference, particularly feedthrough
To rf inputs, affect other receivers or cause self-mixing (very big to the performance impact of zero intermediate frequency reciver).Therefore,
Frequency mixer is needed with good isolation.
（5）Power consumption is the problem that all modules must take into, and reduces the power consumption of frequency mixer, can be effectively reduced system work(
Consumption.
Have an advantage in that：
1. the gain of input signal can be controlled using multistage mixing, the mixer tube without needing higher costs.
2. when the signal frequency for needing frequency conversion is higher, cause local frequency higher, the local oscillation power of the input of needs compared with
Height, causes the local oscillator insulated degree requirement of frequency mixer higher.
3.The noise coefficient for selecting multistage mixing is far longer than using the noise coefficient that one-level is mixed according to cascading equations.
4th, because frequency mixer has cubic non-linearity item, the third order intermodulation amount that the radiofrequency signal of adjacent channel is caused can centering
Frequency output signal causes serious interference, by multistage mixing, it is possible to reduce the IP3 components of adjacent signals are done to intermediate-freuqncy signal
Disturb.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of tuner of multistage frequency conversion, it is characterised in that including low-noise amplifier, intermediate-frequency filter and some mixing
Device, the low-noise amplifier is sequentially connected some frequency mixers, and the frequency mixer is all connected with a voltage controlled oscillator, the high frequency
Head selects the number of times of frequency conversion and the quantity and frequency of corresponding local vibration source, frequency mixer to be located at low according to the height of incoming frequency
After noise amplifier, the radiofrequency signal after low-noise amplifier amplifies directly is processed, frequency mixer is also received from VCO
The local oscillation signal of device, its circuit is fully operational in radio frequency band.
2. the tuner of a kind of multistage frequency conversion according to claim 1, it is characterised in that the frequency mixer is turned by adjusting
Gain is changed, for making up the loss of intermediate-frequency filter and reducing contribution of the frequency mixer subsequent conditioning circuit noise to system noise.
3. the tuner of a kind of multistage frequency conversion according to claim 1, it is characterised in that the frequency mixer is using multistage mixed
Frequency can be controlled to the gain of input signal, the mixer tube without needing higher costs.
4. the tuner of a kind of multistage frequency conversion according to claim 1, it is characterised in that the frequency mixer exist three times it is non-
Linear term, the third order intermodulation amount that the radiofrequency signal of adjacent channel is caused can cause serious interference to IF output signal, pass through
Multistage mixing, it is possible to reduce interference of the IP3 components of adjacent signals to intermediate-freuqncy signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096785.2A CN106657940A (en) | 2016-12-02 | 2016-12-02 | Multistage frequency-conversion tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096785.2A CN106657940A (en) | 2016-12-02 | 2016-12-02 | Multistage frequency-conversion tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106657940A true CN106657940A (en) | 2017-05-10 |
Family
ID=58813241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096785.2A Pending CN106657940A (en) | 2016-12-02 | 2016-12-02 | Multistage frequency-conversion tuner |
Country Status (1)
| Country | Link |
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| CN (1) | CN106657940A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443362A (en) * | 2018-12-29 | 2020-07-24 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1296456A2 (en) * | 2001-09-25 | 2003-03-26 | Zarlink Semiconductor Limited | Radio frequency tuner front end and tuner |
| WO2007140177A3 (en) * | 2006-05-26 | 2008-04-10 | Microtune Texas Lp | Agc system and method for broadband tuners |
| CN201508412U (en) * | 2009-06-16 | 2010-06-16 | 广州市圣大电子有限公司 | Receiver for Beidou satellite navigation and positioning system |
| CN102457231A (en) * | 2011-12-16 | 2012-05-16 | 苏州云芯微电子科技有限公司 | Single-balanced frequency mixer |
| CN103792549A (en) * | 2013-03-05 | 2014-05-14 | 南京波格微电子有限公司 | Radio frequency receiver of Beidou I satellite navigation system |
| CN104518736A (en) * | 2014-12-15 | 2015-04-15 | 北京爱洁隆技术有限公司 | S-band high-linearity, low-noise and low-gain down-conversion active mixer |
-
2016
- 2016-12-02 CN CN201611096785.2A patent/CN106657940A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1296456A2 (en) * | 2001-09-25 | 2003-03-26 | Zarlink Semiconductor Limited | Radio frequency tuner front end and tuner |
| WO2007140177A3 (en) * | 2006-05-26 | 2008-04-10 | Microtune Texas Lp | Agc system and method for broadband tuners |
| CN201508412U (en) * | 2009-06-16 | 2010-06-16 | 广州市圣大电子有限公司 | Receiver for Beidou satellite navigation and positioning system |
| CN102457231A (en) * | 2011-12-16 | 2012-05-16 | 苏州云芯微电子科技有限公司 | Single-balanced frequency mixer |
| CN103792549A (en) * | 2013-03-05 | 2014-05-14 | 南京波格微电子有限公司 | Radio frequency receiver of Beidou I satellite navigation system |
| CN104518736A (en) * | 2014-12-15 | 2015-04-15 | 北京爱洁隆技术有限公司 | S-band high-linearity, low-noise and low-gain down-conversion active mixer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111443362A (en) * | 2018-12-29 | 2020-07-24 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
| CN111443362B (en) * | 2018-12-29 | 2022-04-01 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
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Application publication date: 20170510 |
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