CN106341195A - Calibration system facing radio frequency front end and calibration method - Google Patents
Calibration system facing radio frequency front end and calibration method Download PDFInfo
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- CN106341195A CN106341195A CN201610795824.1A CN201610795824A CN106341195A CN 106341195 A CN106341195 A CN 106341195A CN 201610795824 A CN201610795824 A CN 201610795824A CN 106341195 A CN106341195 A CN 106341195A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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Abstract
The invention discloses a calibration system facing a radio frequency front end and a calibration method. The system comprises signal source equipment, a sampling and base-band processing module, a result recording module and a control module, wherein the control module is separately connected with the signal source equipment, the sampling and base-band processing module and the result recording module, a single-tone signal with special frequency is generated by the signal source equipment and is inputted to the to-be-detected radio frequency front end; intermediate frequency/base-band signals outputted by the to-be-detected radio frequency front end are acquired through the sampling and base-band processing module to realize statistics of an average power, and an output result is inputted into a result recording module; in the result recording module, a frequency-power corresponding relationship is recorded. According to the system, through combined control on the signal source, the radio frequency front end and the base-band processing module, gain characteristics of the radio frequency front end on different frequency points and insertion loss characteristics of a low pass/band pass filter at the radio frequency front end can be rapidly and conveniently acquired, and improvement of calibration test efficiency is facilitated.
Description
Technical field
The present invention relates to a kind of calibration system towards radio-frequency front-end, also relate to corresponding calibration steps, belong to logical
Letter technical field of measurement and test.
Background technology
The effect of radio-frequency front-end is by modules such as low-noise amplifier, frequency mixer, wave filter, variable gain amplifiers
Radiofrequency signal is amplified to certain performance number, and radiofrequency signal is moved by intermediate frequency or base band by mixing operation.It is moving
Irreplaceable important function is played in mobile communication terminal, base station and its test system.
Fig. 1 shows a typical structure example of radio-frequency front-end.In radio-frequency front-end shown in Fig. 1, analog portion
The modules such as low-noise amplifier (lna), frequency mixer (mixer), wave filter at different levels (filters), variable gain amplifier (pga)
Will there is consistent sex differernce, this can impact to the Frequency Response of radio-frequency front-end.When local frequency is different, radio-frequency front-end
Gain different；And on the premise of same local oscillator, the gain at broadband signal different frequent points would also vary from.
At present, in the instrument and equipment for mobile communication test measurement, especially for broadband instrument and equipment, it is subject to
The design complexities of radio-frequency front-end and the conforming impact of device, Frequency Response on different frequent points for the radio-frequency front-end can be poor
Different, and then influence whether the overall performance of instrument and equipment.Only on the premise of carrying out comprehensive accurate alignment, using according to calibration
The preset software parameters of result compensate to the hardware parameter deviation that device uniformity is brought, and can guarantee instrument and equipment performance
Accuracy and reliability.
Disclose in the Chinese invention patent of Patent No. zl 201180053547.2 a kind of using continuous scan frequency
System frequency response method of testing.But the method simply measures to local frequency, and for broadband under different local frequencies
The characteristic of signal is then calibrated, and result in the limited deficiency of calibration accuracy.In addition, in Application No. 201310551590.2
State's patent application discloses a kind of spectrum analyzer with calibration function.Input is only divided into high frequency by this spectrum analyzer
Section/low-frequency range, with receiving front-end carry out corresponding thus being calibrated, consider radio-frequency front-end each module effect impact, with
Sample has that calibration accuracy is not enough.
Content of the invention
For the deficiencies in the prior art, primary technical problem to be solved by this invention is to provide one kind towards before radio frequency
The calibration system at end.
Another technical problem to be solved by this invention is to provide a kind of calibration steps towards radio-frequency front-end.
For realizing above-mentioned goal of the invention, the present invention is using following technical schemes:
According to embodiments of the present invention in a first aspect, providing a kind of calibration system towards radio-frequency front-end, including signal source
Equipment, sampling and baseband processing module, result logging modle and control module；Wherein,
Described control module respectively with described signal source equipment, described sampling and baseband processing module, described result record
Module is attached；
Described signal source equipment generates the tone signal of CF, inputs to radio-frequency front-end to be measured；Described sampling and
Baseband processing module is acquired to the intermediate frequency/baseband signal of radio-frequency front-end output to be measured to count its mean power, output
Result enters result logging modle；In described result logging modle, the corresponding relation of frequency-power is recorded.
Wherein more preferably, before described control module controls signal frequency and the radio frequency to be measured of described signal source equipment output
The local frequency at end, resets and starts described sampling and the work of baseband processing module, and corresponding output result is delivered to described
Result logging modle.
Wherein more preferably, described signal source equipment is vector signal generator.
Wherein more preferably, described sampling and baseband processing module are base band dsp unit, and described result logging modle is master control
mcu.
Second aspect according to embodiments of the present invention, provides a kind of calibration steps towards radio-frequency front-end, based on above-mentioned
Calibration system is realized, and comprises the steps:
(1) signal source equipment sends the tone signal of different frequency to radio frequency to be calibrated successively according to predeterminated frequency interval
Front end, the frequency of radio-frequency front-end to be calibrated is set to the frequency of tone signal and fixed frequency sum is received, and statistics is different
Receiving power under frequency；Normalization obtains the gain of described radio-frequency front-end during local frequency difference；
(2) local frequency of fixation radio-frequency front-end to be calibrated, makes described signal source equipment be spaced according to predeterminated frequency,
Tone signal is sent successively to radio-frequency front-end to be calibrated, before described radio frequency under statistics unlike signal frequency in scheduled frequency range
The receiving power at end；The impact that in removal step (1), result is brought on this basis, normalization obtains under same local frequency,
Described radio-frequency front-end is to the gain at broadband signal different frequent points；
(3) calibration result of comprehensive utilization step (1) and step (2) gained, mends to the amplitude versus frequency characte of radiofrequency signal
Repay.
Wherein more preferably, in described step (1), effective passband of radio-frequency front-end described in the frequency coverage of described tone signal
Scope.
Wherein more preferably, in described step (2), low within radio-frequency front-end described in the frequency coverage of described tone signal
Effective pass band width of logical/bandpass filter.
Wherein more preferably, described scheduled frequency range is f1- bw/2～f1+ bw/2, wherein f1For described local frequency, bw
Effective pass band width of the low pass/bandpass filter within described radio-frequency front-end.
Wherein more preferably, in described step (3), equation below followed on each frequency:
result1(f)=result0(f)-gain1(f)-gain2(f)
Wherein, result1F () is the amplitude versus frequency characte after compensating, result0F () is the amplitude versus frequency characte before compensating, be,
gain1F () is the gain of described radio-frequency front-end when the local frequency obtaining in step (1) is different, gain2F () is in step (2)
Under the same local frequency obtaining, described radio-frequency front-end is to the gain at broadband signal different frequent points.
Wherein more preferably, if the frequency in step (3) does not carry out direct measurement in step (1) and step (2), lead to
Cross lookup table mode or interpolation method obtains corresponding offset.
Compared with prior art, the present invention, can quickly just by jointly controlling signal source, radio-frequency front-end and baseband module
Obtain gain characteristic on different frequent points for the radio-frequency front-end and the insertion loss of the internal low pass/bandpass filter of radio-frequency front-end promptly
Characteristic, thus preferably compensating to it during application radio-frequency front-end, obtains more accurate treatability further
Energy.The present invention can lift calibration accuracy, and simple operation, realization simply, thus have good application prospect.
Brief description
Fig. 1 is the typical structure exemplary plot of radio-frequency front-end；
Fig. 2 is the basic structure schematic diagram of calibration system provided by the present invention.
Specific embodiment
With specific embodiment, detailed specific description is launched to the technology contents of the present invention below in conjunction with the accompanying drawings.
Fig. 2 show the basic structure of the calibration system of present invention offer.This calibration system includes signal source equipment, sampling
And baseband processing module, result logging modle and control module.Wherein, control module is the core of this calibration system, respectively
It is attached with signal source equipment, sampling and baseband processing module, result logging modle.Signal source equipment can generate CF
Tone signal.This tone signal inputs to radio-frequency front-end to be measured.Radio-frequency front-end output intermediate frequency/baseband signal to be measured.Adopt
Sample and baseband processing module carry out modulus according to certain sample frequency to the intermediate frequency/baseband signal of radio-frequency front-end output to be measured
Conversion, the signal of collection certain length is to count its mean power.The output result of this sampling and baseband processing module enters knot
Fruit logging modle.In result logging modle, the corresponding relation of frequency-power is recorded.Control module is to each mould above
Block is jointly controlled, mainly the local frequency of the signal frequency of control signal source device output and radio-frequency front-end to be measured,
Reset and start sampling and the work of baseband processing module, and corresponding information is delivered to result logging modle.
In one embodiment of the invention, set as signal source using vector signal generator agilent e4438c
Standby, radio-frequency front-end to be measured is the wi-fi signal tester of certain model, and base band dsp unit is sampling and baseband processing module, main
Control mcu logging modle as a result, using pc or server as control module.Pc or server pass through netting twine and signal
Source device e4438c is connected with wi-fi signal tester to be measured, and control signal source device e4438c sends tone signal
Frequency and the local frequency of tested radio-frequency front-end, and enable master control mcu and base band dsp unit to enter row operation as requested simultaneously
Storage result.
In the present invention it is considered to the impact of radio-frequency front-end each module synthesis effect, in order to improve compensation for calibrating errors precision, distinguish
Local frequency difference is led at the difference of rf gain and broadband signal different frequent points under the premise of same local oscillator with gain not
With being calibrated, in compensation process, two aspect factors are combined.With reference to above-described embodiment specific work process to this
Invent provided radio-frequency front-end calibration steps to illustrate.
(1) signal source equipment is spaced f according to predeterminated frequencystep1Send tone signal (frequency f successively0) to be calibrated penetrating
Frequency front end, the frequency of radio-frequency front-end lo to be calibrated is set to (f0+ △ f) is received, the reception under statistics unlike signal frequency
Power.Normalization in this way obtains the different gains of the radio-frequency front-end when local frequency is different:
gain1(f),f∈[fl,fl+fstep1,fl+2×fstep1,fl+3×fstep1,…,fh] (1)
In formula (1), flThe low-limit frequency covering for radio-frequency front-end, fhThe highest frequency covering for radio-frequency front-end, this step needs
Cover the complete effective free transmission range of radio-frequency front-end, to obtain the insertion loss impact that radio-frequency front-end integrally brings.
In one embodiment of the invention, the working frequency range of wi-fi signal tester includes 2.4ghz frequency range and 5ghz
Frequency range.For 2.4ghz frequency range, make signal source equipment e4438c successively with 12.5khz for interval, output 2372mhz,
2372.0125mhz, 2372.025mhz ..., the tone signal of 2511.9875mhz, 2512mhz, signal strength signal intensity be -10dbm,
Be correspondingly arranged tested radio-frequency front-end local frequency be 2372.1mhz, 2372.1125mhz, 2372.125mhz ...,
2512.0875mhz、2512.1mhz.So, what base band dsp unit sampling obtained is the tone signal of a 100khz.Using
Base band dsp unit carries out 100us sampling to each frequency, reports to master control mcu after statistical signal mean power.Complete to own
After frequency measurement, normalized is done by master control mcu, and by final result array gain1Report to pc or server.For
5ghz frequency range, is also carried out similar process, and here is just not explained in detail.
(2) local frequency f of fixation radio-frequency front-end lo to be calibrated1, make signal source equipment be spaced according to predeterminated frequency
fstep2, from f1- bw/2～from f1+ bw/2 sends tone signal successively to radio-frequency front-end to be calibrated, counts unlike signal frequency
Under radio-frequency front-end to be calibrated receiving power.The impact that in removal step (1), result is brought on this basis, normalization obtains
Under the premise of same local oscillator, radio-frequency front-end is to gain at broadband signal different frequent points:
gain2(f),f∈[-bw/2,-bw/2+fstep2,-bw/2+2×fstep2,-bw/2+3×fstep2,…,bw/2] (2)
In formula (2), bw is effective pass band width of the internal low pass/bandpass filter of radio-frequency front-end.Therefore, this step needs
Cover effective pass band width of the internal low pass/bandpass filter of radio-frequency front-end.If there are different low pass/bandpass filters,
Different filter characteristics need to be done and test respectively, to obtain the insertion loss impact that wave filter brings.
In one embodiment of the invention, the local frequency of the tested radio-frequency front-end of fixation is 2442mhz, successively order letter
Number source device e4438c with 12.5khz for interval, output 2402mhz, 2402.0125mhz, 2402.025mhz ...,
2481.9875mhz, the tone signal of 2482mhz.Beyond removing [2441.9mhz, 2442.1mhz] does not measure, using base band
Dsp unit carries out 100us sampling to each frequency, reports to master control mcu after statistical signal mean power.Complete all frequencies
After measurement, it is normalized by master control mcu, and by final result array gain2Report to pc or server.For
High and low two frequency ranges of 5ghz, because wave filter used is otherwise varied, need to do respectively similar process.Corresponding process step
It is the routine techniques means that those of ordinary skill in the art can grasp, here is just not explained in detail.
(3) calibration result of comprehensive utilization step (1) and step (2) gained, mends to the amplitude versus frequency characte of radiofrequency signal
Repay.If the amplitude versus frequency characte after compensating is result1F (), the amplitude versus frequency characte before compensation is result0F (), then on each frequency
result1(f)=result0(f)-gain1(f)-gain2(f).
When being received to signal by radio-frequency front-end, during radio-frequency front-end, difference is frequently for receipt signal
The radiofrequency signal of rate component different can be affected by it.For this reason, in radio-frequency front-end calibration steps provided by the present invention, will
This impact is divided into the insertion loss of the overall insertion loss of radio-frequency front-end and front end low pass/bandpass filter.Therefore using
During radio-frequency front-end, the calibration result of comprehensive utilization step (1) and step (2) gained, the amplitude versus frequency characte of radiofrequency signal is mended
Repay.
It should be noted that carrying out in step (1) and step (2) needing during calibration measurement to fully take into account required frequency
Interval.If the frequency in step (3) does not carry out direct measurement in step (1) and step (2), need by lookup table mode or
Interpolation method obtains corresponding offset.
In one embodiment of the invention, the calibration result that abovementioned steps are obtained after treatment, preserves to wi-fi letter
In number tester.When carrying out the measurement of wi-fi equipment inband flatness using wi-fi signal tester, straight for receipt signal
Connect calculated flatness results, on its basis the numerical value of different frequent points need to be deducted with above step (1) and step (2) obtains
The gain arriving1And gain2Two values (can obtain the offset of corresponding frequency by lookup table mode or interpolation method), after compensation
The calibration result obtaining is only final result.
In sum, the present invention proposes a kind of calibration system being applied to radio-frequency front-end and calibration steps, respectively to this
Vibration frequency difference leads to the difference of gain at the difference of rf gain and broadband signal different frequent points under the premise of same local oscillator to be entered
Row calibration, thus compensated to it using two aspect calibration results, thus obtaining further during application radio-frequency front-end
More accurate process performance.The calibration system that the present invention provides is by jointly controlling signal source, radio-frequency front-end and Base-Band Processing
Module, can quickly and easily obtain gain characteristic on different frequent points for the radio-frequency front-end and the internal low pass/band logical of radio-frequency front-end
The insertion loss characteristic of wave filter, is conducive to improving calibration test efficiency.
Above the calibration system towards radio-frequency front-end provided by the present invention and calibration steps are described in detail.
For those of ordinary skill in the art, on the premise of without departing substantially from true spirit to it done any aobvious and easy
The change seen, all will belong to the protection domain of patent right of the present invention.
Claims (10)
1. a kind of calibration system towards radio-frequency front-end it is characterised in that include signal source equipment, sampling and baseband processing module,
Result logging modle and control module；Wherein,
Described control module respectively with described signal source equipment, described sampling and baseband processing module, described result logging modle
It is attached；
Described signal source equipment generates the tone signal of CF, inputs to radio-frequency front-end to be measured；Described sampling and base band
Processing module is acquired to the intermediate frequency/baseband signal of radio-frequency front-end output to be measured to count its mean power, output result
Enter result logging modle；In described result logging modle, the corresponding relation of frequency-power is recorded.
2. calibration system as claimed in claim 1 it is characterised in that:
Described control module controls the signal frequency of described signal source equipment output and the local frequency of radio-frequency front-end to be measured, multiple
Position simultaneously starts described sampling and the work of baseband processing module, and corresponding output result is delivered to described result logging modle.
3. calibration system as claimed in claim 1 or 2 it is characterised in that:
Described signal source equipment is vector signal generator.
4. calibration system as claimed in claim 1 or 2 it is characterised in that:
Described sampling and baseband processing module are base band dsp unit, and described result logging modle is master control mcu.
5. a kind of calibration steps towards radio-frequency front-end, is realized based on the calibration system described in claim 1 or 2, and its feature exists
In comprising the steps:
(1) signal source equipment sends the tone signal of different frequency to radio frequency to be calibrated successively according to predeterminated frequency interval
End, the frequency of radio-frequency front-end to be calibrated is set to the frequency of tone signal and fixed frequency sum is received, the different frequency of statistics
Receiving power under rate；Normalization obtains the gain of described radio-frequency front-end during local frequency difference；
(2) local frequency of fixation radio-frequency front-end to be calibrated, makes described signal source equipment be spaced according to predeterminated frequency, predetermined
Tone signal is sent successively to radio-frequency front-end to be calibrated, described radio-frequency front-end under statistics unlike signal frequency in frequency range
Receiving power；The impact that in removal step (1), result is brought on this basis, normalization obtains under same local frequency, described
Radio-frequency front-end is to the gain at broadband signal different frequent points；
(3) calibration result of comprehensive utilization step (1) and step (2) gained, compensates to the amplitude versus frequency characte of radiofrequency signal.
6. calibration steps as claimed in claim 5 it is characterised in that:
In described step (1), effective free transmission range of radio-frequency front-end described in the frequency coverage of described tone signal.
7. calibration steps as claimed in claim 5 it is characterised in that:
In described step (2), the having of low pass/bandpass filter within radio-frequency front-end described in the frequency coverage of described tone signal
Effect pass band width.
8. calibration steps as claimed in claim 7 it is characterised in that:
Described scheduled frequency range is f1- bw/2～f1+ bw/2, wherein f1For described local frequency, bw is described radio-frequency front-end
Effective pass band width of internal low pass/bandpass filter.
9. calibration steps as claimed in claim 5 it is characterised in that:
In described step (3), equation below followed on each frequency:
result1(f)=result0(f)-gain1(f)-gain2(f)
Wherein, result1F () is the amplitude versus frequency characte after compensating, result0F () is the amplitude versus frequency characte before compensating, be, gain1(f)
The gain of described radio-frequency front-end, gain when local frequency for obtaining in step (1) is different2F () is the same of acquisition in step (2)
Under one local frequency, described radio-frequency front-end is to the gain at broadband signal different frequent points.
10. calibration steps as claimed in claim 9 it is characterised in that:
If the frequency in step (3) does not carry out direct measurement in step (1) and step (2), by lookup table mode or slotting
Value mode obtains corresponding offset.
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Cited By (5)
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| CN108011676A (en) * | 2017-11-30 | 2018-05-08 | 航天恒星科技有限公司 | The method for automatic measurement and system of radio frequency link |
| CN108667457A (en) * | 2017-03-31 | 2018-10-16 | 晨星半导体股份有限公司 | Bandwidth adjusting method and relevant Bandwidth adjustment unit and weakened phase restoring module |
| CN110501591A (en) * | 2019-08-20 | 2019-11-26 | 中国人民解放军国防科技大学 | System and method for testing electromagnetic environment adaptability of radio receiver |
| CN112350786A (en) * | 2020-10-28 | 2021-02-09 | 深圳市汇顶科技股份有限公司 | Calibration method, system, related equipment and medium for radio frequency receiver |
| CN113014260A (en) * | 2021-03-10 | 2021-06-22 | 中国电子科技集团公司第三十四研究所 | Automatic detection method of radio frequency signal amplitude based on programmable function |
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| CN108667457A (en) * | 2017-03-31 | 2018-10-16 | 晨星半导体股份有限公司 | Bandwidth adjusting method and relevant Bandwidth adjustment unit and weakened phase restoring module |
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| CN110501591A (en) * | 2019-08-20 | 2019-11-26 | 中国人民解放军国防科技大学 | System and method for testing electromagnetic environment adaptability of radio receiver |
| CN112350786A (en) * | 2020-10-28 | 2021-02-09 | 深圳市汇顶科技股份有限公司 | Calibration method, system, related equipment and medium for radio frequency receiver |
| CN112350786B (en) * | 2020-10-28 | 2022-09-02 | 深圳市汇顶科技股份有限公司 | Calibration method, system, related equipment and medium for radio frequency receiver |
| CN113014260A (en) * | 2021-03-10 | 2021-06-22 | 中国电子科技集团公司第三十四研究所 | Automatic detection method of radio frequency signal amplitude based on programmable function |
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