CN102780535B - A kind of vector network analyzer Poewr control method based on intermediate frequency detection - Google Patents
A kind of vector network analyzer Poewr control method based on intermediate frequency detection Download PDFInfo
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Abstract
A kind of vector network analyzer Poewr control method based on intermediate frequency detection, driving source is divided into two-way by coupler, one tunnel is exported by port through coupler as test signal, another road is as reference signal, mixing is carried out with local vibration source, the intermediate-freuqncy signal exported is divided into two-way again, one tunnel enters receiver and carries out network parameter calculating, another road is through bandpass filtering, intermediate frequency detection, after logarithmic amplification, integration is carried out with control voltage, the output feedack of integrator is to the variable attenuator in driving source, like this, a closed loop auto level control link is formed between driving source and intermediate frequency.
Description
Technical field
The present invention relates to a kind of vector network analyzer Poewr control method based on 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 apply is exactly the index test to miscellaneous amplifier, as when measuring the compression point of high-precision amplifying, wishes that the source power precision that tester exports is as far as possible high; When measuring high-gain and high-power microwave amplifier, wish that the source power of tester has wider power scan scope; When pulse-modulated signal encourages, wish that pulse power is accurately controlled.
The power control techniques of existing tester, substantially auto level control (ALC) technology of carrying out broadband demodulation based on inside sources port is all adopted, directly broadband demodulation is carried out from source port owing to adopting, along with the increase of bandwidth, noise power increases thereupon, precision obviously declines, and especially under condition of small signal, the deterioration of power accuracy is more serious.In addition, the application of clock is more and more extensive, such as pulse radar, and the cable distribution characteristic test etc. based on time domain reflection technology all needs transmitted pulse signal, and the fixed ampllitude of pulse signal, be also a difficult problem all the time.
Traditional auto level control theory diagram as shown in Figure 1.Separating a road signal at source output terminal by power splitter and carry out detection, for increasing the control range to power, rectified signal being carried out logarithmic amplification.Reference level is exported by D/A, for realizing the setting of main frame to power.The output voltage of reference level and logarithmic amplification carries out integration, finally feeds back on the electrically controlled attenuator on the path of source, forms a feedback loop like this, realizes auto_steady amplitude and the control of source power.
In order to ensure the Absolute power accuracy that source exports, finally with power meter, port power is calibrated.Want to obtain higher power flatness, need calibration more to count, but calibration is counted more, the time spent is also longer.If when source exports as pulse condition, from frequency domain, broadband demodulation is all frequency contents for pulse, and not only for the carrier power in arteries and veins, from time domain, detection exports and has more becoming for pulse switch, is difficult to make power stability on the power set by reference level.Traditional pulse power control method is the way with software compensation after open loop, disconnect by Fig. 1 breaker in middle, loop is arranged to open loop situations, with power meter, port power output is calibrated, constantly reference level is adjusted in calibration process, until port power reaches the performance number that will set, calibration data is preserved.This mode cannot ensure the precision of not calibrating frequency or power points, and because the alignment time is comparatively slow, we only calibrate minority test point usually, and like this, the power accuracy under pulse condition cannot ensure.
Existing power control techniques directly carries out broadband demodulation from the output port of microwave signal source owing to adopting, and noise is inevitable to be increased with bandwidth increase, and is easy to the impact by the humorous clutter of signal source.The indexs such as this directly has influence on the accuracy of source power, the linearity, power scan scope.And for the test of some high power device, when needing outside network analyzer to increase extra driving amplifier, the power accuracy that now additional amplifier exports will more be difficult to ensure.In addition, this fixed ampllitude mode cannot realize the auto_steady amplitude under pulse condition.
Summary of the invention
For above-mentioned shortcoming, the present invention makes full use of the feature of vector network analyzer, namely 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, propose a kind of Poewr control method based on intermediate frequency detection, because vector network analyzer IF-FRE is fixed, and it is very low, be generally a few MHz, so can by narrowband intermediate frequency wave detector for controlling broad band microwave signal synthesizer power, and the carrier wave of clock can be extracted by intermediate frequency filtering, realize the auto_steady amplitude of closed loop under pulse condition.
An object of the present invention is achieved through the following technical solutions:
Driving source is divided into two-way by coupler, one tunnel is exported by port through coupler as test signal, another road is as reference signal, mixing is carried out with local vibration source, the intermediate-freuqncy signal exported is divided into two-way again, one tunnel enters receiver and carries out network parameter calculating, another road is through bandpass filtering, after intermediate frequency detection, logarithmic amplification, integration is carried out with control voltage, the output feedack of integrator, to the variable attenuator in driving source, like this, forms a closed loop auto level control link between driving source and intermediate frequency.
Utilize the feature of vector network analyzer self, namely the driving source of vector network analyzer and local vibration source are all the time with the frequency departure synchronous scanning of intermediate frequency.EF power and driving source power linear, like this, just can substitute the mode of direct source port broadband demodulation with intermediate frequency detection.Due to the some frequency that intermediate frequency is fixing, and frequency is lower, so by carrying out narrow-band demodulation after band-pass filter, can reduce noise power, improve signal to noise ratio, and the humorous clutter that can reduce outside band pass filter band being on the impact of detection.
In order to ensure the absolute precision of port power, with power meter, port power is calibrated.Because the intermediate frequency of vector network analyzer is lower, and be fixed frequency, so be easy to design band pass filter by intermediate frequency filtering.Like this, the noise be added on wave detector is less, higher to power control accuracy, and can realize the detection process of more small-signal, increases power scan scope.And have specially for the high performance logarithmic amplifier of intermediate frequency, greatly can simplify circuit design.
When driving source exports as pulse condition, the fixed ampllitude to arteries and veins intercarrier be realized, need to obtain carrier power.When after driving source and local vibration source mixing, carrier frequency has been reduced to lower intermediate frequency, just the intermediate frequency of carrier wave can be obtained by band pass filter, comparatively speaking, intermediate-frequency filter more easily designs, and when pulse frequency is higher, the interval between the spectral line of pulse frequency spectrum is larger, bandpass filtering effect is better, and final fixed ampllitude effect is better.In this way, pulse fixed ampllitude can adopt the mode of identical closed loop with continuous wave fixed ampllitude, improves band internal power flatness.
The present invention is owing to adopting the mode of narrowband intermediate frequency detection, improve the signal to noise ratio of detection, thus improve power accuracy, expand power scan scope, and intermediate-frequency channel increases bandpass filtering, the carrier wave in pulse excitation source can be obtained, thus the closed loop fixed ampllitude of driving source under better realizing pulse condition, clock power accuracy is improved.Owing to adopting the detection of receiver intermediate frequency, not by the restriction of signal source bandwidth, thus the power of more broadband signal can be controlled.In addition, the power control mode of intermediate frequency detection is adopted can also to solve uncontrollable problem of power accuracy etc. advantage when instrument outside increases amplifier and spreads to higher frequency.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
Fig. 1 auto level control theory diagram
Fig. 2 is based on the network analyzer power control block figure of intermediate frequency detection
Fig. 3 driving source exports as time domain waveform during pulse condition
Fig. 4 driving source exports as frequency-domain waveform during pulse condition
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
Driving source is divided into two-way by coupler 1 as shown in Figure 2, one tunnel is exported by port one through coupler 2 as test signal, another road is as reference signal, mixing is carried out with local vibration source, the R intermediate-freuqncy signal exported is divided into two-way again, one tunnel enters receiver and carries out network parameter calculating, another road is through bandpass filtering, after intermediate frequency detection, logarithmic amplification, integration is carried out with control voltage, the output feedack of integrator, to the variable attenuator in driving source, like this, forms a closed loop auto level control link between driving source and intermediate frequency.
Utilize the feature of vector network analyzer self, namely the driving source of vector network analyzer and local vibration source are all the time with the frequency departure synchronous scanning of intermediate frequency.EF power and driving source power linear, like this, just can substitute the mode of direct source port broadband demodulation with intermediate frequency detection.Due to the some frequency that intermediate frequency is fixing, and frequency is lower, so by carrying out narrow-band demodulation after band-pass filter, can reduce noise power, improve signal to noise ratio, and the humorous clutter that can reduce outside band pass filter band being on the impact of detection.
In order to ensure the absolute precision of port power, with power meter, port power is calibrated.Because the intermediate frequency of vector network analyzer is lower, and be fixed frequency, so be easy to design band pass filter by intermediate frequency filtering.Like this, the noise be added on wave detector is less, higher to power control accuracy, and can realize the detection process of more small-signal, increases power scan scope.And have specially for the high performance logarithmic amplifier of intermediate frequency, greatly can simplify circuit design.
When driving source exports as pulse condition, the fixed ampllitude to arteries and veins intercarrier be realized, need to obtain carrier wave.When after driving source and local vibration source mixing, carrier frequency has been reduced to lower intermediate frequency, just the intermediate frequency of carrier wave can be obtained by band pass filter, comparatively speaking, intermediate-frequency filter more easily designs, and when pulse frequency is higher, the interval between the spectral line of pulse frequency spectrum is larger, bandpass filtering effect is better, and final fixed ampllitude effect is better.
Claims (3)
1. the vector network analyzer Poewr control method based on intermediate frequency detection, it is characterized in that: driving source is divided into two-way by coupler, one tunnel is exported by port through coupler as test signal, another road is as reference signal, mixing is carried out with local vibration source, the intermediate-freuqncy signal exported is divided into two-way again, one tunnel enters receiver and carries out network parameter calculating, another road is through bandpass filtering, intermediate frequency detection, after logarithmic amplification, integration is carried out with control voltage, the output feedack of integrator is to the variable attenuator in driving source, like this, a closed loop auto level control link is formed between driving source and intermediate frequency,
When driving source exports as pulse condition, realize the fixed ampllitude to arteries and veins intercarrier, need to obtain carrier wave, when after driving source and local vibration source mixing, carrier wave has been reduced to lower intermediate frequency, just can be obtained the intermediate frequency of carrier wave by band pass filter.
2. as claimed in claim 1 based on the vector network analyzer Poewr control method of intermediate frequency detection, it is characterized in that: intermediate frequency is by after bandpass filtering, carrier frequency in the arteries and veins that can obtain pulse condition, and then realize the closed loop fixed ampllitude under pulse condition, improve the fixed ampllitude precision of pulse condition.
3. as claimed in claim 1 based on the vector network analyzer Poewr control method of intermediate frequency detection, it is characterized in that: working band is wide, not by the restriction of signal source bandwidth, fixed ampllitude speed is fast, omits the software compensation for wave detector frequency response during the calibration of power.
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| CN103873033B (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 |
| 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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| CN105471520B (en) * | 2015-11-11 | 2018-10-12 | 中国电子科技集团公司第四十一研究所 | A kind of automatic adjustment method of the open loop power linearity applied to signal generator |
| CN105606885B (en) * | 2015-12-25 | 2018-07-06 | 北京无线电计量测试研究所 | A kind of pulse power measurement system based on intermediate frequency substitute 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 |
| CN108490333B (en) * | 2018-02-13 | 2020-04-03 | 北京无线电计量测试研究所 | Nonlinear S parameter inspection device |
| CN109596213B (en) * | 2018-12-29 | 2021-09-28 | 北京宏动科技有限公司 | Ultra-wideband impulse narrow pulse power measuring method |
| CN110554259B (en) * | 2019-08-07 | 2021-08-17 | 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 |
| CN112039519B (en) * | 2020-08-12 | 2022-09-20 | 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 |
| CN114124008A (en) * | 2021-11-12 | 2022-03-01 | 中国电子科技集团公司第二十九研究所 | Broadband self-adaptive AGC circuit and assembling method thereof |
| CN114441890B (en) * | 2022-04-08 | 2022-06-24 | 深圳市鼎阳科技股份有限公司 | Network analyzer with ultra-wideband detection gain control |
| 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 |
| CN116455422A (en) * | 2023-04-19 | 2023-07-18 | 中电科思仪科技股份有限公司 | Terahertz vector network analyzer and output power electric adjustment method thereof |
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