CN100512265C - Gain measurement device for on-line calibration and method thereof - Google Patents
Gain measurement device for on-line calibration and method thereof Download PDFInfo
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- CN100512265C CN100512265C CN200480043311.0A CN200480043311A CN100512265C CN 100512265 C CN100512265 C CN 100512265C CN 200480043311 A CN200480043311 A CN 200480043311A CN 100512265 C CN100512265 C CN 100512265C
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- 238000000034 method Methods 0.000 title claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
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- 238000005859 coupling reaction Methods 0.000 abstract description 4
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- 238000010586 diagram Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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Abstract
A gain measurement device for on line calibration, includes a calibration signal generator, a first switch, a signal converter translating frequency of a calibration signal, a first coupler coupling the calibration signal with an input signal of a means to which gain needs to be known, a second coupler taking the calibration signal from an output signal of the means, a second switch, and, a measurement circuit. A gain measurement method for on line calibration, which obtain a gain of a means to be known, comprises: (a) translating frequency of a calibration signal to match input of the means; (b) coupling the calibration signal to the means with an input signal of the means and sending to the means; (c) measuring a level of the calibration signal taken from an output signal of the means by a measurement circuit; (d) rerouting the calibration signal through a reference path, and measuring a level of the calibration signal from the reference path with the said measurement circuit; (e) calculating the gain according to the calibration signal levels measured in step (c) and step (d). The invention solves that gain of the signal chain can be very accurately determined.
Description
Technical field
The measuring technique of signal link in the present invention relates to communicate by letter, particularly a kind of gain measuring device and method thereof that is used for on-line calibration.
Background technology
For the output of operate as normal or correct calculation signal link, the gain of signal link need be known in many systems.Because the variation of physical environment, the gain of signal link may change unintentionally.For example, for the accurately gain of control frequency switching signal link, can measure its amplitude in the input injection calibrating signal of signal link and in the output of signal link.If input signal amplitude is known and amplitude output signal can accurately be measured, just can calculates and adjust gain.Usually optionally measuring receiver measurement is adopted in gain, and optionally measuring receiver can be in the input and output two place's measuring frequency and the signal levels of signal link.
The technical problem of this scheme comprises:
(1) for input signal (calibrating signal that comprises injection) and output signal (calibrating signal that comprises injection), can only send a signal to measuring receiver at every turn; Therefore calibrating signal level and measuring receiver can be subjected to the influence of ambient temperature and carrier frequency, are difficult to accurately know the amplitude of input signal (calibrating signal that comprises injection) and output signal owing to temperature and frequency change.
(2) in operating temperature range, at the detector of signal link output place, for example measuring receiver optionally need have very high dynamic range and accuracy, so detector is measuring frequency and signal level accurately, thus very complicated and expensive.
(3) because the calibrating signal level must enough just can have good certainty of measurement greatly, therefore the calibrating signal of injecting can other useful signal of interference signal link.
Summary of the invention
The object of the present invention is to provide a kind of gain measuring device that is used for on-line calibration, thereby can accurately determine the gain of signal link.
A kind of gain measuring device that is used for on-line calibration, comprise calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled obtains second coupler of calibrating signal, second switch from the output signal of this gain apparatus to be measured, and measuring circuit, wherein the output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with signal converter, and another output of first switch is connected with an input of second switch; The output of signal converter is connected with first coupler; Second coupler is connected with another input of second switch; Second switch output is connected with measuring circuit.
A kind of gain measuring device that is used for on-line calibration, comprise calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled obtains second coupler of calibrating signal, second switch from the output signal of this gain apparatus to be measured, and measuring circuit, wherein the output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with first coupler, and another output of first switch is connected with an input of second switch; Second coupler is connected with the input of signal converter; The output of signal converter is connected with another input of second switch; The output of second switch is connected with measuring circuit.
A kind of gain measuring device that is used for on-line calibration, comprise calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled obtains second coupler of calibrating signal, second switch from the output signal of this gain apparatus to be measured, and measuring circuit, wherein the output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with first coupler, and another output of first switch is connected with the input of signal converter; The output of signal converter is connected with an input of second switch; Second coupler is connected with another input of second switch; The output of second switch is connected with measuring circuit.
Another object of the present invention is to provide a kind of gain measuring method that is used for on-line calibration, thereby can accurately determine the gain of signal link.
A kind of gain measuring method that is used for on-line calibration, this method obtains the gain to be measured of device, comprising:
(a) frequency of conversion calibrating signal is to mate with the input of this device;
(b) input signal that will be sent to the calibrating signal of this device and this device is coupled and is sent to this device;
(c) adopt the level of measuring circuit measurement from the calibrating signal of the output signal acquisition of this device;
(d) reference path is delivered in the calibrating signal repeating transmission, and adopted the level of described measuring circuit measurement from the calibrating signal of reference path;
(e) according to the calibrating signal level calculated gains of measuring in step (c) and the step (d).
Compared with prior art, the present invention has the following advantages:
1. adopt identical measuring circuit calibrating signal to be measured in input and output.Twice measurement carried out on measuring circuit with approximately uniform signal level and frequency, and just Measuring Time has different slightly.This can eliminate because temperature drift and the measuring circuit common measure error that causes such as non-linear, only has the change in gain of some passive devices can cause the uncertainty of measurement.
2. all carry out owing to all measurements, so measuring circuit can be very simple with approximately uniform signal level.
3. even shared identical frequency, calibrating signal can not disturbed useful signal yet.This is because calibrating signal has low level and narrow bandwidth (continuous wave signal).Because measuring circuit has narrow bandwidth, even therefore other useful signal exists, measuring circuit still can detect the low level calibrating signal with very high accuracy.Like this, measurement just can be carried out when the signal link operate as normal.
4. calibration signal frequency changes in the process of measuring output signal level, and this can be avoided any narrow band interference.
5. this measuring circuit is fit to be integrated on the chip.
Description of drawings
Fig. 1 shows the simplified block diagram of gain in the measuring receiver (RX).
Fig. 2 shows and is used for adjusting before the switch 1 and the block diagram of the calibrating signal behind the switch 2.
Fig. 3 shows the The general frame with signal converter input.
Fig. 4 shows the The general frame with signal converter output.
Fig. 5 shows the The general frame that signal converter is arranged in reference path.
Fig. 6 shows the block diagram of the diversity receiver link with pilot tone gain measurement function.
Embodiment
Describe the present invention below in conjunction with drawings and Examples.
For the frequency conversion signal link, allow calibration signal frequency no better than the output center frequency of signal link can solve the problem of existence of the prior art.Measure and to carry out with approximately uniform signal level in order to make input measurement and output, before the input that calibrating signal is fed to signal link be: by switch calibrating signal is retransmitted the input of delivering to signal link from the input of measuring circuit, and calibrating signal is converted to correct frequency by frequency mixer to its unique modification of carrying out.So just might adopt input calibration signal level and calibrating signal level in the same circuitry for signal measurement measuring-signal link output, and the measurement time delay between the input and output is very little, thereby can very accurately determines the gain of signal link.Can when measuring input and output, be arranged to approximately uniform level owing to be sent to the calibrating signal level of measuring circuit, so the amplitude measurement circuit need not very big dynamic range.Because the measurement of input and output is to carry out, therefore has good accuracy under identical condition.The variation of frequency mixer and turn off gain will be the main source that causes measuring uncertainty, yet switch and frequency mixer are all stablized because of simple in structure being easy to.
Because the amplitude of calibrating signal can be starkly lower than useful signal, therefore will can not produce and disturb other useful signal in the frequency conversion signal link.This probably realizes, because calibrating signal is a continuous wave, takies very little bandwidth, and compares with the bandwidth of useful signal, and measuring circuit also has narrower arrowband.Calibrating signal can be measured at the multiple different frequency place of signal link passband, and can avoid the interference from other narrow band signal, and this can make it to become possibility by the frequency of offset calibration signal.
Fig. 1 shows the simplified block diagram that gains in the measuring receiver.Measurement mechanism comprises the pilot tone generator that pilot tone is generated as calibrating signal, pilot tone is switched to the switch 1 of signal link or reference path, pilot tone is converted to correct frequency to avoid interference the frequency mixer of useful signal, the coupler 1 that pilot tone and receiver input signal are coupled, pick up the coupler 2 of pilot tone from the receiver output signal, pilot tone is switched to the switch 2 of measuring circuit and measuring circuit from reference path or from coupler 2.In Fig. 1, receiver can be regarded the measured signal link as.Reference path is not for the simple transmission line of any active or passive component, and the gain of reference path must be for known.Two switches must have the good insertion loss of coupling between signal link and reference path, and it is unimportant definitely to insert loss.Frequency mixer and coupler must have stable or predictable insertion loss.
On-line calibration is measured and is carried out as follows:
At first with the power setting of pilot tone in the power stage that can not cause interference, with of the output center frequency shift (FS) of this pilot tone frequency with respect to signal link to useful signal.Make inner monolateral band (SSB) pilot tone that generates by signal link then, be about to switch 1 and be set to as shown in fig. 1.Thereafter pilot tone, is measured by measuring circuit up to switch 2 then by frequency mixer, coupler 1, receiver and coupler 2.
Secondly pilot tone is retransmitted and delivered to the reference path that has clearly defined gain, promptly this moment, two switches all placed opposite position.At this moment, pilot tone sends by reference path, switch 1 and switch 2.Measuring circuit is measured the pilot tone level.The signal level of twice measurement is all used identical power-measuring circuit.
By adopting the pilot tone of injecting, the gain of signal link can be provided with very high accuracy, only needs the room temperature calibration aborning.Though the non-shared components and parts of signal link and reference path will be the main sources of error, they are quite stable in whole temperature range.These elements comprise: frequency mixer, switch and coupler.
If it is very big to be input to the dynamic range of signal of receiver, should adjust and the pilot tone level should follow the variation of incoming signal level substantially so that the signal to noise ratio of measurement mechanism is enough big and pilot tone is not disturbed useful signal pilot tone.Signal behind pilot tone signal before the switch 1 and the switch 2 should be adjusted simultaneously so that they are in the identical scope.The dynamic range of measuring circuit can be very low.Fig. 2 shows and is used for adjusting before the switch 1 and the block diagram of the calibrating signal behind the switch 2.Level regulator can be controlled by external signal, and device shown in the figure can be any device of gain to be measured.
This technical scheme is applicable to many different application scenarios.Fig. 3, Fig. 4 and Fig. 5 show the different technical scheme of placing signal converter, wherein, signal converter can be for the pilot tone frequency being changed in case with the frequency mixer of shown device input coupling.In Fig. 3, pilot tone arrives this device by coupler 1 then by signal converter; In Fig. 4, the pilot tone that is coupled by coupler 2 arrives switch 2 by signal converter; In Fig. 5, signal converter places reference path.All technical schemes all can make the gain of this device obtain determining accurately.The device that rises with the square frame frame can be any device of gains to be measured such as amplifier, receiver or transmitter in the drawings.
Some links can multiplexed same gain measurement unit 600 as shown in Figure 6.Fig. 6 shows the block diagram of the diversity receiver link with pilot tone gain measurement function, and purpose is how explaination gain measurement unit can be multiplexed between two receivers.In Fig. 6, two radio frequencies (RF) signal is carried out down-conversion respectively with intermediate frequency (IF) signal in the output receiver medium-frequency band scope.Gain measurement unit 600 comprises pilot tone generator, switch 1, switch 2, and as the narrow band filter of measuring circuit, and with Fig. 1,2,3,4 and 5 identical reference paths.
When needs are known the gain of receiver 601, receiver selected cell 607 makes coupler 603 link to each other with gain measurement unit 600, so that the pilot tone that gain measurement unit 600 generates can be coupled with radiofrequency signal and be sent to receiver 601, simultaneously receiver selected cell 608 makes coupler 604 link to each other with gain measurement unit 600, so that the pilot tone of exporting from receiver 601 can be sent in gain measurement unit 600 and the narrow band filter gain measurement unit 600 measures.On the other hand, when needs are known the gain of receiver 602, receiver selected cell 607 makes coupler 605 link to each other with gain measurement unit 600, the pilot tone that makes gain measurement unit 600 generate can be coupled with radiofrequency signal and be sent to receiver 602, simultaneously receiver selected cell 608 makes coupler 606 link to each other with gain measurement unit 600, measures so that the pilot tone of exporting from receiver 602 can be sent in gain measurement unit 600 and the same narrow band filter gain measurement unit 600.
Claims (13)
1. gain measuring device that is used for on-line calibration, it is characterized in that, this gain measuring device comprises calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled, obtain second coupler of calibrating signal from the output signal of this gain apparatus to be measured, second switch, and measuring circuit, wherein
The output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with signal converter, and another output of first switch is connected with an input of second switch; The output of signal converter is connected with first coupler; Second coupler is connected with another input of second switch; The output of second switch is connected with measuring circuit.
2. gain measuring device according to claim 1 is characterized in that, this gain measuring device further comprises first level regulator and second level regulator by external signal control; The input of first level regulator is connected with the output of calibration signal generator, and the output of first level regulator is connected with the input of first switch; The input of second level regulator is connected with the output of second switch, and the output of second level regulator is connected with measuring circuit.
3. gain measuring device according to claim 1 and 2 is characterized in that, described calibration signal generator is the pilot tone generator.
4. gain measuring device that is used for on-line calibration, it is characterized in that, this device comprises calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled, obtain second coupler of calibrating signal from the output signal of this gain apparatus to be measured, second switch, and measuring circuit, wherein
The output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with first coupler, and another output of first switch is connected with an input of second switch; Second coupler is connected with the input of signal converter; The output of signal converter is connected with another input of second switch; The output of second switch is connected with measuring circuit.
5. gain measuring device according to claim 4 is characterized in that, this gain measuring device further comprises first level regulator and second level regulator by external signal control; The input of first level regulator is connected with the output of calibration signal generator, and the output of first level regulator is connected with the input of first switch; The input of second level regulator is connected with the output of second switch, and the output of second level regulator is connected with measuring circuit.
6. according to claim 4 or 5 described gain measuring devices, it is characterized in that described calibration signal generator is the pilot tone generator.
7. gain measuring device that is used for on-line calibration, it is characterized in that, this gain measuring device comprises calibration signal generator, first switch, the signal converter of conversion calibration signal frequency, first coupler that the input signal of calibrating signal and gain apparatus to be measured is coupled, obtain second coupler of calibrating signal from the output signal of this gain apparatus to be measured, second switch, and measuring circuit, wherein
The output of calibration signal generator is connected with the input of first switch; An output of first switch is connected with first coupler, and another output of first switch is connected with the input of signal converter; The output of signal converter is connected with an input of second switch; Second coupler is connected with another input of second switch; The output of second switch is connected with measuring circuit.
8. gain measuring device according to claim 7 is characterized in that, this gain measuring device further comprises first level regulator and second level regulator by external signal control; The input of first level regulator is connected with the output of calibration signal generator, and the output of first level regulator is connected with the input of first switch; The input of second level regulator is connected with the output of second switch, and the output of second level regulator is connected with measuring circuit.
9. according to claim 7 or 8 described gain measuring devices, it is characterized in that described calibration signal generator is the pilot tone generator.
10. gain measuring method that is used for on-line calibration, this method obtains the gain to be measured of device, comprises
(a) frequency of conversion calibrating signal is to mate with the input of this device;
(b) input signal that will be sent to the calibrating signal of this device and this device is coupled and is sent to this device;
(c) adopt measuring circuit to measure the level of the calibrating signal that from the output signal of this device, obtains;
(d) reference path is delivered in the calibrating signal repeating transmission, and adopted the level of described measuring circuit measurement from the calibrating signal of reference path;
(e) according to the calibrating signal level calculated gains of measuring in step (c) and the step (d).
11. gain measuring method according to claim 10 is characterized in that, step (a) further comprises before according to the input signal of this device adjusts the calibrating signal level;
Between step (b) and step (c), further comprise simultaneously: the level of adjusting the calibrating signal that from this device output signal, obtains.
12. gain measuring method according to claim 10 is characterized in that, step (d) comprising: described reference path is set for not with the transmission line of any active or passive component.
13. gain measuring method according to claim 10 is characterized in that, step (a) comprising: with respect to the centre frequency of the output signal of this device with the calibrating signal frequency shift (FS).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/000331 WO2005099212A1 (en) | 2004-04-09 | 2004-04-09 | Gain measurement device for on line calibration and thereof method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1969523A CN1969523A (en) | 2007-05-23 |
| CN100512265C true CN100512265C (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200480043311.0A Expired - Fee Related CN100512265C (en) | 2004-04-09 | 2004-04-09 | Gain measurement device for on-line calibration and method thereof |
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| Country | Link |
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| CN (1) | CN100512265C (en) |
| WO (1) | WO2005099212A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411422A (en) * | 2016-12-07 | 2017-02-15 | 中国电子科技集团公司第五十四研究所 | Automatic testing method for splitting and combining device |
| CN117997438A (en) * | 2022-11-07 | 2024-05-07 | 华为技术有限公司 | System and method for demodulating signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07243873A (en) * | 1994-03-04 | 1995-09-19 | Fuji Electric Co Ltd | Calibration method of measuring display device for uninterruptible power source apparatus |
| US6229400B1 (en) * | 1999-10-22 | 2001-05-08 | Motorola Inc. | Method and apparatus for a calibrated frequency modulation phase locked loop |
| GB2390495A (en) * | 2002-07-05 | 2004-01-07 | Motorola Inc | Calibration of a transmitter or receiver in a transceiver wherein transmitter signals may be detected via the receiver or a separate detection arrangement |
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2004
- 2004-04-09 CN CN200480043311.0A patent/CN100512265C/en not_active Expired - Fee Related
- 2004-04-09 WO PCT/CN2004/000331 patent/WO2005099212A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| CN1969523A (en) | 2007-05-23 |
| WO2005099212A1 (en) | 2005-10-20 |
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Granted publication date: 20090708 |