CN104536339A - High-speed-digital-demodulation-based power control system and method of vector network analyzer - Google Patents
High-speed-digital-demodulation-based power control system and method of vector network analyzer Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 37
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- 238000012360 testing method Methods 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 12
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- 238000005086 pumping Methods 0.000 claims description 8
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- 230000006835 compression Effects 0.000 description 7
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
Abstract
The invention provides a high-speed-digital-demodulation-based power control system and method of a vector network analyzer. On the basis of the digital demodulation and processing way, nearly all digital filters with any random bandwidths can be designed by using a digital signal processing technology, thereby improving the signal to noise ratio of demodulation and achieving an objective of enlarging a power scanning range. The digital demodulation link of the vector network analyzer has high linearity, so that the power control accuracy is improved. With the power control method for digital demodulation and processing, the designs of circuits of microwave detector and a log amplifier and the like are not needed, thereby simplifying the loop hardware design. Because demodulation is carried out on the intermediate frequency without limitation of a signal source frequency range, the same set of amplitude stabilization system can be applied to power control of the vector network analyzer in different power ranges as long as the intermediate frequency is not changed.
Description
Technical field
The present invention relates to the technical field of measurement and test of electromagnetic wave energy, be specifically related to a kind of vector network analyzer power control system based on high-speed figure detection and method.
Background technology
Along with the extensive employing of digital modulation technique in such as broadband digital communication system of various advanced person, in order to reduce the bit error rate of system, designer not only needs the amplitude versus frequency characte being concerned about whole radio-frequency system, also requires to measure its phase-frequency characteristic simultaneously.Vector network analyzer is a kind of general microwave and millimeter wave surveying instrument, for what is called as identical in input and output frequencies such as amplifier, wave filter, diplexers widely used in radio-frequency system with frequency parts, the accurate measurement to its amplitude-frequency and phase frequency vectorial property can be realized.
Conventional vector network analyzer mainly carries out small-signal linear measurement, requires relatively low to exciting signal source power index.Modern Vector Network Analyzer function gets more and more, and start by linear to nonlinear measurement transition, nonlinear characteristic is relevant with power, so the non-linear test function of Modern Vector Network Analyzer is had higher requirement to power index.Vector network analyzer is mainly divided into signal source and receiver two large divisions from hardware, so way traditional in source power control adopts the power of widely used auto level control (ALC) technology to vector network analyzer in synthesized source to control.
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 range of control to power, rectified signal being carried out logarithmic amplification.Datum is exported by D/A, for realizing the setting of main frame to power.The output voltage of datum and logarithmic amplification compares and carries out integration to relative error, finally feeds back on the electrically controlled attenuator in the path of source, forms a feedback loop like this, realizes auto_steady amplitude and the control of source power.
Application number be 201210252024.7 application for a patent for invention propose a kind of vector network analyzer power control scheme based on intermediate frequency detection, as shown in Figure 2.
This scheme utilizes the exciting signal source Source of vector network analyzer and receiver local vibration source LO to remain that fixing intermediate frequency carries out the feature of synchronous scanning, by carrying out the automatic control of detection realization to pumping signal source power at intermediate frequency.Because intermediate frequency detection bandwidth is narrower, thus improve detection signal to noise ratio (S/N ratio), increase power regulation range and power accuracy.
Because this two schemes realizes with mimic channel completely, mimic channel bandwidth is relatively wide, and noise causes more greatly power control accuracy relatively low.
Summary of the invention
For solving the problems of the prior art; the present invention proposes a kind of vector network analyzer power control system based on high-speed figure detection and method; wave detector in traditional scheme and logarithmic amplifying circuit is replaced by digital received path; form a numerical model analysis ALC loop to control power; and then improve detection sensitivity and detection accuracy, reach the object improving power regulation range and vector network analyzer emission port power control accuracy.For reaching above-mentioned purpose, on the one hand, embodiments provide a kind of vector network analyzer power control system based on high-speed figure detection, comprising:
Exciting signal source, attenuator, the first coupling mechanism, the second coupling mechanism, frequency mixer, local vibration source, power amplifier, bandpass filter, test channel, reference channel, CPU and driving amplifier;
Wherein, described exciting signal source is connected with the input end of described first coupling mechanism by described attenuator;
First output terminal of described first coupling mechanism is connected with the input end of described second coupling mechanism, and its second output terminal is connected with the first input end of described frequency mixer;
Second input end of described frequency mixer is connected with described local vibration source, and its output terminal is connected with described bandpass filter by described power amplifier;
Described bandpass filter is connected by the first input end of described reference channel with addressed CPU;
First output terminal of described second coupling mechanism is connected with output port, and the second output terminal of described second coupling mechanism is connected with second input end of described CPU by described test channel;
The output terminal of described CPU is connected with described attenuator by described driving amplifier.
Further, described reference channel comprises: interconnective first high-speed a/d converter and the first high speed digital signal processor DSP; Wherein, described first high-speed a/d converter is connected with described bandpass filter, and described first high-speed dsp is connected with the first input end of described CPU;
Described test channel comprises: interconnective second high-speed a/d converter and the second high-speed dsp; Wherein, described second high-speed a/d converter is connected with the second output terminal of described second coupling mechanism, and described second high-speed dsp is connected with second input end of described CPU.
On the other hand, the invention provides a kind of vector network analyzer Poewr control method based on high-speed figure detection, comprising:
The pumping signal that exciting signal source produces, is divided into test signal and reference signal by the first coupling mechanism coupling mechanism;
Described test signal is exported by output port after the second coupling mechanism;
This second coupling mechanism by reflected signal after tested passage carry out after sampling and computing complete detection, being sent to CPU;
The local oscillation signal that described reference signal and local vibration source produce carries out mixing, generates intermediate-freuqncy signal; This intermediate-freuqncy signal, through to amplify and after bandpass filtering, is undertaken after sampling and computing complete detection, being sent to CPU by reference channel;
Described CPU is according to the reflected signal after the reference signal after process and process, generate feedback signal, and this feedback signal is sent to driving amplifier, to make this driving amplifier drive attenuator to change damping capacity, realize the automatic control of the power to described pumping signal.
Further, described test channel is sampled and computing to described reflected signal, is specially:
By the second high-speed a/d converter, described reflected signal is sampled, by the second high-speed dsp, computing is carried out to the reflected signal after sampling;
Described reference channel is sampled and computing to described intermediate-freuqncy signal, is specially:
By the first high-speed a/d converter, described intermediate-freuqncy signal is sampled, by the first high-speed dsp, computing is carried out to the intermediate-freuqncy signal after sampling.
Technique scheme has following beneficial effect:
Technique scheme adopts the mode of digital detection and process, almost can be designed the digital filter of any bandwidth by Digital Signal Processing, thus improves the signal to noise ratio (S/N ratio) of detection, reaches the object improving power scan scope.The vector network analyzer digital detection link linearity is high, improves power control accuracy.Adopt the Poewr control method of digital detection and process, do not need circuit such as design microwave detector and logarithmic amplifier etc., simplify loop hardware design, owing to carrying out detection to intermediate frequency, not by the restriction of signal source frequency scope, as long as therefore intermediate frequency is constant, the power that same set of fixed ampllitude system can be applied to the vector network analyzer of different frequency scope controls.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is auto level control theory diagram of the prior art;
Fig. 2 is the power control principle block diagram of prior art based on intermediate frequency detection;
Fig. 3 is the network analyzer power control system theory diagram based on high-speed figure detection of the embodiment of the present invention one;
Fig. 4 is the process flow diagram of the vector network analyzer Poewr control method based on high-speed figure detection of the embodiment of the present invention two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Vector network analyzer is the indispensable surveying instrument of microwave and millimeter wave device and equipment performance field tests.Along with developing rapidly of microwave and millimeter wave technology, require more and more higher to the performance index of testing tool.In the compression point test of the frequency mixer such as used at high-precision receiver and amplifier, measure 1dB compression point can not meet the demands, wish to measure the even more high-precision compression point of 0.1dB, the measurement of high precision compression point only just can be carried out under the condition that driving source power accuracy is high.In amplifier test, sometimes need gain and the compression point of testing multi-stage cascade amplifier, at this moment higher requirement be it is also proposed to power scan scope.Existing vector network analyzer power control techniques is all the power control techniques directly adopting synthesized source, realize power with mimic channel completely to control, the general bandwidth of mimic channel is relatively wide, precision is relatively low, at present both at home and abroad vector network analyzer power scan range specifications is less than 50dB, and power control accuracy is within ± 1dB.Be difficult to realize the requirements such as 0.1dB compression point test.
Based on the above-mentioned problems in the prior art, the invention provides a kind of vector network analyzer power control system based on high-speed figure detection and method, the power control accuracy of microwave vector network analyzer and the bottleneck of power scan scope is improved to solve, realize significantly improving vector network analyzer emission port power accuracy and power scan range specifications, be convenient to the high precision compression point test realizing more than 0.1dB.
Embodiment one
As shown in Figure 3, for the present embodiment is based on the theory diagram of the network analyzer power control system of high-speed figure detection, comprising:
Exciting signal source 101, attenuator 102, first coupling mechanism 103, second coupling mechanism 104, frequency mixer 105, local vibration source 106, power amplifier 107, bandpass filter 108, test channel 109, reference channel 110, CPU111 and driving amplifier 112;
Wherein, described exciting signal source 101 is connected with the input end of described first coupling mechanism 103 by described attenuator 102;
First output terminal of described first coupling mechanism 103 is connected with the input end of described second coupling mechanism 104, and its second output terminal is connected with the first input end of described 105 frequency mixer;
Second input end of described frequency mixer 105 is connected with described local vibration source 106, and its output terminal is connected with described bandpass filter 108 by described power amplifier 107;
Described bandpass filter 108 is connected with the first input end of described CPU111 by described reference channel 110;
First output terminal of described second coupling mechanism 104 is connected with output port 113, and the second output terminal of described second coupling mechanism 104 is connected with second input end of described CPU111 by described test channel 109;
The output terminal of described CPU111 is connected with described attenuator 102 by described driving amplifier 112.
Further, described reference channel 110 comprises: interconnective first high-speed a/d converter and the first high speed digital signal processor DSP; Wherein, described first high-speed a/d converter is connected with described bandpass filter, and described first high-speed dsp is connected with the first input end of described CPU;
Described test channel 109 comprises: interconnective second high-speed a/d converter and the second high-speed dsp; Wherein, described second high-speed a/d converter is connected with the second output terminal of described second coupling mechanism, and described second high-speed dsp is connected with second input end of described CPU.
Pass through said system, pumping signal is divided into two-way by the first coupling mechanism, one tunnel is exported by output port through the second coupling mechanism as test signal, another road is as reference signal R, mixing is carried out with local vibration source, the R intermediate-freuqncy signal exported is after amplification and bandpass filtering, sampled by high-speed a/d converter, DSP carries out computing and completes detection, central processing unit sends feedback signal according to result and drives electrically controlled attenuator by driving amplifier, change damping capacity, realize the automatic control to power.Like this, a closed loop auto level control link is formed between driving source and vector network analyzer digital receiver passage.
The present embodiment makes full use of the resource of vector network analyzer self, and the mode of the treatment circuit such as wave detector and logarithmic amplifier that namely the high-sensitivity digital receiving path of vector network analyzer substitutes in ALC realizes the control to power.
Embodiment two
No matter existing vector network analyzer power control techniques adopts directly is carried out broadband demodulation from the output port of microwave signal source, or the narrow-band demodulation carried out from intermediate frequency, all realized by mimic channel, even if intermediate frequency detection, its bandwidth is also at tens more than MHz, noise is still larger, for the integrated logarithmic detector AD8310 that performance index are in the market higher, detection sensitivity is about-70dBm, the linearity is 0.4dB, is still difficult to meet the requirement of 0.1dB power accuracy and wider power regulation range.
As shown in Figure 4, for the present embodiment is based on the process flow diagram of the vector network analyzer Poewr control method of high-speed figure detection, comprising:
Step 401, the pumping signal that exciting signal source produces, is divided into test signal and reference signal by the first coupling mechanism coupling mechanism;
Step 402, described test signal is exported by output port after the second coupling mechanism;
Step 403, this second coupling mechanism by reflected signal after tested passage carry out after sampling and computing complete detection, being sent to CPU;
Step 404, the local oscillation signal that described reference signal and local vibration source produce carries out mixing, generates intermediate-freuqncy signal; This intermediate-freuqncy signal, through to amplify and after bandpass filtering, is undertaken after sampling and computing complete detection, being sent to CPU by reference channel;
Step 405, described CPU, according to the reflected signal after the reference signal after process and process, generates feedback signal, and this feedback signal is sent to driving amplifier, to make this driving amplifier drive attenuator to change damping capacity, realize the automatic control of the power to described pumping signal.
Further, described test channel is sampled and computing to described reflected signal, is specially:
By the second high-speed a/d converter, described reflected signal is sampled, by the second high-speed dsp, computing is carried out to the reflected signal after sampling;
Described reference channel is sampled and computing to described intermediate-freuqncy signal, is specially:
By the first high-speed a/d converter, described intermediate-freuqncy signal is sampled, by the first high-speed dsp, computing is carried out to the intermediate-freuqncy signal after sampling.
Power regulation range depend on fixed ampllitude loop treatable large-signal and the ability of small-signal that can detect, in general, vector network analyzer output power on market is about 20dBm to the maximum, the signal being input to wave detector is coupled out sub-fraction (degree of coupling 15dB) from main road, so large-signal can not cause fixed ampllitude loop to compress, the factor of restriction loop regulation range is mainly in the sensitivity of small-signal detection.The present embodiment is convenient to adopt Digital Signal Processing by high-speed figure detection, and the bandwidth of digital filter almost can accomplish any control, generally can reach 1Hz.So stronger to the rejection ability of noise, sensitivity is higher, thus improves power regulation range.In general the receiving sensitivity of vector network analyzer can up to more than 120dB, thus can make power regulation range reach more than 120dB in theory.
In power control accuracy, although frequency mixer is nonlinear device, RF input power and the intermediate frequency output power of frequency mixer have very high linear relationship, and this is contradiction not.The intermediate-freuqncy signal that frequency mixer exports is by 16 high-speed a/d converters, and quantization error is very little, thus can ensure very high detection precision, thus improves power control accuracy.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the replaceability (interchangeability) of clear displaying hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function.Such function is the designing requirement realizing depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1., based on a vector network analyzer power control system for high-speed figure detection, it is characterized in that, comprising:
Exciting signal source, attenuator, the first coupling mechanism, the second coupling mechanism, frequency mixer, local vibration source, power amplifier, bandpass filter, test channel, reference channel, central processor CPU and driving amplifier;
Wherein, described exciting signal source is connected with the input end of described first coupling mechanism by described attenuator;
First output terminal of described first coupling mechanism is connected with the input end of described second coupling mechanism, and its second output terminal is connected with the first input end of described frequency mixer;
Second input end of described frequency mixer is connected with described local vibration source, and its output terminal is connected with described bandpass filter by described power amplifier;
Described bandpass filter is connected by the first input end of described reference channel with addressed CPU;
First output terminal of described second coupling mechanism is connected with output port, and the second output terminal of described second coupling mechanism is connected with second input end of described CPU by described test channel;
The output terminal of described CPU is connected with described attenuator by described driving amplifier.
2. system according to claim 1, is characterized in that, described reference channel comprises: interconnective first high-speed a/d converter and the first high speed digital signal processor DSP; Wherein, described first high-speed a/d converter is connected with described bandpass filter, and described first high-speed dsp is connected with the first input end of described CPU;
Described test channel comprises: interconnective second high-speed a/d converter and the second high-speed dsp; Wherein, described second high-speed a/d converter is connected with the second output terminal of described second coupling mechanism, and described second high-speed dsp is connected with second input end of described CPU.
3., based on a vector network analyzer Poewr control method for high-speed figure detection, it is characterized in that, comprising:
The pumping signal that exciting signal source produces, is divided into test signal and reference signal by the first coupling mechanism;
Described test signal is exported by output port after the second coupling mechanism;
This second coupling mechanism by reflected signal after tested passage carry out after sampling and computing complete detection, being sent to CPU;
The local oscillation signal that described reference signal and local vibration source produce carries out mixing, generates intermediate-freuqncy signal; This intermediate-freuqncy signal, through to amplify and after bandpass filtering, is undertaken after sampling and computing complete detection, being sent to CPU by reference channel;
Described CPU is according to the reflected signal after the reference signal after process and process, generate feedback signal, and this feedback signal is sent to driving amplifier, to make this driving amplifier drive attenuator to change damping capacity, realize the automatic control of the power to described pumping signal.
4. method according to claim 3, is characterized in that, described test channel is sampled and computing to described reflected signal, is specially:
By the second high-speed a/d converter, described reflected signal is sampled, by the second high-speed dsp, computing is carried out to the reflected signal after sampling;
Described reference channel is sampled and computing to described intermediate-freuqncy signal, is specially:
By the first high-speed a/d converter, described intermediate-freuqncy signal is sampled, by the first high-speed dsp, computing is carried out to the intermediate-freuqncy signal after sampling.
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