CN102780535A - Intermediate-frequency detection based vector network analyzer power control method - Google Patents
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Abstract
The invention discloses an intermediate-frequency detection based vector network analyzer power control method. An excitation source is divided into two paths by couplers, one path serves as testing signals which are outputted through a port via the couplers, the other path serves as reference signals which are in frequency mixing with a local oscillator, outputted intermediate-frequency signals are divided into two paths, the intermediate-frequency signals in one path enter a receiver for network parameter calculation, the intermediate-frequency signals in the other path are integrated with control voltage by means of band-pass filtering, intermediate-frequency detection and logarithmic amplification, output of an integrator is fed back to a variable attenuator in the excitation source, and accordingly, a closed-loop automatic level control link is formed among the excitation source and the intermediate-frequency signals .
Description
Technical field
The present invention relates to a kind of vector network analyzer Poewr control method based on the intermediate frequency detection.
Background technology
Vector network analyzer is obvious to all in the importance of radio frequency, microwave and millimeter wave field tests.One of them typical application is exactly the index test to miscellaneous amplifier, as when measuring the compression point of high-precision amplifying, hopes that the source power precision of tester output is high as far as possible; When measuring the high-gain and high-power microwave amplifier, hope that the source power of tester has the power scan scope of broad; When pulse-modulated signal encourages, hope that pulse power is accurately controlled.
The power control techniques of existing tester; Basically all adopt automatic electric-level control (ALC) technology of carrying out broadband demodulation based on the inside sources port, directly carry out broadband demodulation owing to adopt, along with the increase of bandwidth from source port; Noise power increases thereupon; Precision obviously descends, and especially under the small-signal state, the deterioration of power precision is more serious.In addition, the application of clock more and more widely such as pulse radar, all need the transmitted pulse signal based on the cable distribution characteristic test of Time Domain Reflectometry technology etc., and the fixed ampllitude of pulse signal also is a difficult problem all the time.
Traditional automatic electric-level control principle block diagram is as shown in Figure 1.Tell one road signal at source output terminal by power splitter and carry out detection,, rectified signal is carried out logarithm amplify for increasing control range to power.Reference level is exported by D/A, is used to realize the setting of main frame to power.The output voltage that reference level and logarithm amplify carries out integration, finally feeds back on the electrically controlled attenuator on the path of source, forms a feedback loop like this, realizes the auto_steady amplitude and the control of source power.
For the absolute power accuracy of assurance source output, with power meter port power is calibrated at last.Seek out higher power flatness, need calibration more to count, many more but calibration is counted, the time that is spent is also long more.When if the source is output as pulse condition, see that from frequency domain broadband demodulation is all frequency contents to pulse; And not only to the carrier power in the arteries and veins; See that from time domain detection output has the change more to pulse switch, be difficult to make power stability on the power of setting by reference level.Traditional pulse power control method is with the way of software compensation after the open loop; Be about to switch disconnection among Fig. 1; Loop is arranged to open loop situations, the port power output is calibrated, constantly adjust reference level in the calibration process with power meter; Up to port power reach the performance number that will set, calibration data is preserved.This mode can't guarantee not calibrate the precision of frequency or power points, because the alignment time is slower, we only calibrate the minority test point usually, and like this, the power precision under the pulse condition can't guarantee.
Existing power control techniques is owing to adopt direct output port from microwave signal source to carry out broadband demodulation, and noise is inevitable to be increased with bandwidth, and is easy to receive the influence of the humorous clutter of signal source.This directly has influence on the accuracy of source power, the linearity, indexs such as power scan scope.And for the test of some high power device, in the time need increasing extra driving amplifier outside the network analyzer, the power precision that adds amplifier output this moment will more be difficult to guarantee.In addition, this fixed ampllitude mode can't realize the auto_steady amplitude under the pulse condition.
Summary of the invention
To above-mentioned shortcoming, the present invention makes full use of the characteristics of vector network analyzer, and promptly vector network analyzer comprises driving source and receiver two parts; And the frequency departure of driving source and receiver local vibration source is constant all the time; A kind of Poewr control method based on the intermediate frequency detection has been proposed, owing to the vector network analyzer IF-FRE is fixed, and very low; Be generally several MHz; So can the narrowband intermediate frequency wave detector be used to control broad band microwave signal synthesizer power, and can extract the carrier wave of clock, realize the auto_steady amplitude of closed loop under the pulse condition through intermediate frequency filtering.
One of the object of the invention is realized through following technical scheme:
Driving source is divided into two-way through coupler, and one the tunnel passes through port as test signal through coupler exports, and another road is signal as a reference; Carry out mixing with local vibration source, the intermediate-freuqncy signal of output is divided into two-way again, and one the tunnel gets into receiver carries out network parameter calculating; Another road is through bandpass filtering; After intermediate frequency detection, logarithm amplify, carry out integration with control voltage, the output of integrator feeds back to the variable attenuator in the driving source; Like this, form a closed loop automatic electric-level control link between driving source and the intermediate frequency.
Utilize the characteristics of vector network analyzer self, promptly the driving source of vector network analyzer and local vibration source are all the time with the frequency departure synchronous scanning of intermediate frequency.Intermediate frequency power and driving source power are linear, like this, just can use the intermediate frequency detection to substitute the mode of direct source port broadband demodulation.Because intermediate frequency is fixing some frequency, and frequency is lower, so can reduce noise power, has improved signal to noise ratio, and can reduce of the influence of the outer humorous clutter of band pass filter band detection through carrying out narrow-band demodulation after the band-pass filter.
In order to guarantee the absolute precision of port power, port power is calibrated with power meter.Because the intermediate frequency of vector network analyzer is lower, and is fixed frequency, so be easy to design band pass filter with intermediate frequency filtering.Like this, the noise that is added on the wave detector is littler, and is higher to the power control precision, and can realize that more the detection of small-signal is handled, and increases the power scan scope.And special high performance logarithmic amplifier to intermediate frequency is arranged, can simplify circuit design greatly.
When driving source is output as pulse condition, realize fixed ampllitude to the arteries and veins intercarrier, need to obtain carrier power.After driving source and local vibration source mixing, carrier frequency has been dropped to lower intermediate frequency, just can obtain the intermediate frequency of carrier wave through band pass filter; Comparatively speaking; Intermediate-frequency filter designs more easily, and it is high more to work as pulse frequency, and the interval between the spectral line of pulse frequency spectrum is big more; The bandpass filtering effect is good more, and final fixed ampllitude effect is good more.In this way, the pulse fixed ampllitude can adopt the mode of identical closed loop with the continuous wave fixed ampllitude, improves band internal power flatness.
The present invention is owing to adopt the mode of narrowband intermediate frequency detection; Improve the signal to noise ratio of detection, thereby improved the power precision, enlarged the power scan scope; And intermediate-frequency channel increases bandpass filtering; Can obtain the carrier wave in pulse excitation source, thereby better realize the closed loop fixed ampllitude of driving source under the pulse condition, clock power precision is improved.Owing to adopt the detection of receiver intermediate frequency, do not receive the restriction of signal source bandwidth, thereby can control the more power of broadband signal.In addition, adopt the power control mode of intermediate frequency detection can also solve uncontrollable problem of power precision or the like advantage when instrument is outside to be increased amplifier and spread to higher frequency.
Description of drawings
Below in conjunction with accompanying drawing specific embodiment of the present invention is done further detailed explanation.
Fig. 1 automatic electric-level control principle block diagram
Fig. 2 is based on the network analyzer power control block diagram of intermediate frequency detection
Time domain waveform when Fig. 3 driving source is output as pulse condition
Frequency-domain waveform when Fig. 4 driving source is output as pulse condition
Embodiment
Below will combine accompanying drawing, the preferred embodiments of the present invention will be carried out detailed description; Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
Driving source as shown in Figure 2 is divided into two-way through coupler 1, and one the tunnel passes through port one as test signal through coupler 2 exports, and another road is signal as a reference; Carry out mixing with local vibration source, the R intermediate-freuqncy signal of output is divided into two-way again, and one the tunnel gets into receiver carries out network parameter calculating; Another road is through bandpass filtering; After intermediate frequency detection, logarithm amplify, carry out integration with control voltage, the output of integrator feeds back to the variable attenuator in the driving source; Like this, form a closed loop automatic electric-level control link between driving source and the intermediate frequency.
Utilize the characteristics of vector network analyzer self, promptly the driving source of vector network analyzer and local vibration source are all the time with the frequency departure synchronous scanning of intermediate frequency.Intermediate frequency power and driving source power are linear, like this, just can use the intermediate frequency detection to substitute the mode of direct source port broadband demodulation.Because intermediate frequency is fixing some frequency, and frequency is lower, so can reduce noise power, has improved signal to noise ratio, and can reduce of the influence of the outer humorous clutter of band pass filter band detection through carrying out narrow-band demodulation after the band-pass filter.
In order to guarantee the absolute precision of port power, port power is calibrated with power meter.Because the intermediate frequency of vector network analyzer is lower, and is fixed frequency, so be easy to design band pass filter with intermediate frequency filtering.Like this, the noise that is added on the wave detector is littler, and is higher to the power control precision, and can realize that more the detection of small-signal is handled, and increases the power scan scope.And special high performance logarithmic amplifier to intermediate frequency is arranged, can simplify circuit design greatly.
When driving source is output as pulse condition, realize fixed ampllitude to the arteries and veins intercarrier, need to obtain carrier wave.After driving source and local vibration source mixing, carrier frequency has been dropped to lower intermediate frequency, just can obtain the intermediate frequency of carrier wave through band pass filter; Comparatively speaking; Intermediate-frequency filter designs more easily, and it is high more to work as pulse frequency, and the interval between the spectral line of pulse frequency spectrum is big more; The bandpass filtering effect is good more, and final fixed ampllitude effect is good more.
Claims (5)
1. vector network analyzer Poewr control method based on the intermediate frequency detection; It is characterized in that with driving source and local vibration source be mixed to that intermediate frequency carries out envelope detection, bandpass filtering again, logarithm amplifies and Integral Processing after; Feed back to the variable attenuator in the driving source again; The closed loop automatic electric-level control link of formation between from the driving source to the intermediate frequency realized control and fixed ampllitude to source power.
2. the vector network analyzer Poewr control method based on the intermediate frequency detection as claimed in claim 1, it is characterized in that: driving source is divided into two-way through coupler, and one the tunnel passes through port as test signal through coupler exports; Another road is signal as a reference, carries out mixing with local vibration source, and the intermediate-freuqncy signal of output is divided into two-way again; One the tunnel gets into receiver carries out network parameter calculating, and another road is through bandpass filtering, after intermediate frequency detection, logarithm amplify; Carry out integration with control voltage; The output of integrator feeds back to the variable attenuator in the driving source, like this, forms a closed loop automatic electric-level control link between driving source and the intermediate frequency.
3. according to claim 1 or claim 2 vector network analyzer Poewr control method based on the intermediate frequency detection; It is characterized in that: intermediate frequency is through behind the bandpass filtering; Can obtain the interior carrier frequency of arteries and veins of pulse condition, and then realize the closed loop fixed ampllitude under the pulse condition, improve the fixed ampllitude precision of pulse condition.
4. according to claim 1 or claim 2 vector network analyzer Poewr control method based on the intermediate frequency detection; It is characterized in that: when driving source is output as pulse condition; Realize fixed ampllitude, need to obtain carrier wave, after driving source and local vibration source mixing the arteries and veins intercarrier; Carrier wave has been dropped to lower intermediate frequency, just can obtain the intermediate frequency of carrier wave through band pass filter.
5. according to claim 1 or claim 2 vector network analyzer Poewr control method based on the intermediate frequency detection, it is characterized in that: working band is wide, does not receive the restriction of signal source bandwidth, and fixed ampllitude speed is fast, omits the software compensation to the wave detector frequency response during calibration of power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103873033A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio-frequency signal source and work method thereof |
| CN103873005A (en) * | 2012-12-10 | 2014-06-18 | 北京普源精电科技有限公司 | Radio frequency signal source and working method thereof |
| CN104536339A (en) * | 2014-12-02 | 2015-04-22 | 中国电子科技集团公司第四十一研究所 | High-speed-digital-demodulation-based power control system and method of vector network analyzer |
| CN105471520A (en) * | 2015-11-11 | 2016-04-06 | 中国电子科技集团公司第四十一研究所 | Open-loop power linearity automatic debugging method applied to signal generator |
| CN105606885A (en) * | 2015-12-25 | 2016-05-25 | 北京无线电计量测试研究所 | Pulse power measurement system based on intermediate frequency alternative technology |
| CN106788792A (en) * | 2016-11-24 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of wideband multi-channel Poewr control method for being applied to vector network analyzer |
| CN108490333A (en) * | 2018-02-13 | 2018-09-04 | 北京无线电计量测试研究所 | A kind of non-linear S-parameters verifying attachment |
| CN109596213A (en) * | 2018-12-29 | 2019-04-09 | 北京宏动科技有限公司 | Ultra wide band impulse burst pulse power measurement technology |
| CN110554259A (en) * | 2019-08-07 | 2019-12-10 | 中电科仪器仪表有限公司 | Integrated vector network analyzer suitable for modulation domain and measurement method |
| CN110749869A (en) * | 2019-11-22 | 2020-02-04 | 中国电子科技集团公司第四十一研究所 | System and method for adjusting port power of millimeter wave and terahertz S parameter test spread spectrum module |
| CN112039519A (en) * | 2020-08-12 | 2020-12-04 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
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| CN115473524A (en) * | 2022-09-19 | 2022-12-13 | 广东圣大通信有限公司 | Automatic level control's agile frequency source |
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| CN103873005B (en) * | 2012-12-10 | 2017-10-24 | 北京普源精电科技有限公司 | Radio-frequency signal source and its method of work |
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