CN105515693A - Wideband measurement method for dual-channel wideband receiver of vector network analyzer - Google Patents
Wideband measurement method for dual-channel wideband receiver of vector network analyzer Download PDFInfo
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- CN105515693A CN105515693A CN201510464223.8A CN201510464223A CN105515693A CN 105515693 A CN105515693 A CN 105515693A CN 201510464223 A CN201510464223 A CN 201510464223A CN 105515693 A CN105515693 A CN 105515693A
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Abstract
The invention relates to a wideband measurement method for a dual-channel wideband receiver of a vector network analyzer, and solves the problem that a dynamic range of a low frequency band cannot be consistent with that of a high frequency band as a lot of noises are introduced when the frequency varies under a low frequency end in the wideband measurement. At a low frequency band (within 10MHz), an ADC is used for direct sampling so that the vector network analyzer can obtain a higher dynamic range at the low frequency band; and at a high frequency band, a fixed intermediate frequency sampling signal is obtained after a down-conversion through the wideband mixing technology, then the ADC sampling is performed, and therefore the measurable range at the high frequency band is improved. The vector network analyzer is allowed to have a very wide frequency band range through a low frequency channel and a high frequency channel.
Description
Technical field
The invention belongs to vector network analysis technical field, is a kind of wide-band width measurement method of the binary channels broadband receiver for vector network analyzer particularly.
Background technology
Along with the development of measuring technique, the frequency range of required test is more and more wider, in wide-band to dynamic range requirement more and more higher, this just requires that vector network analyzer can disposable test more low frequency and higher frequency, while test wide frequency ranges, the consistency of testing dynamic range be ensured.
Traditional vector network analyzer, basic employing full frequency band mixed-mode realizes receiver scheme, in whole receiver frequency range, signal passes through low noise amplifier and the slope attenuator of radio-frequency front-end, be transformed to the radiofrequency signal required by frequency mixer, the local oscillation signal mixing provided with vector network analyzer in frequency mixer, by a down-conversion, fixed intermediate frequency signal required for generation, whether automatic gain control circuit optionally takes amplification to intermediate-freuqncy signal, then carries out quantised samples.This scheme cannot meet broadband test demand.
Existing scheme mainly realizes receiver scheme by full frequency band mixed-mode, and vector network analyzer cannot be made to carry out the test of high band and low-frequency range simultaneously, main manifestations be following some:
1, low-frequency range dynamic range is little: because low-frequency range also adopts mixing scheme, due to the restriction of frequency mixer self character and the deterioration of low frequency local oscillation signal phase noise, cause the sensitivity of receiver radio frequency receiving terminal to decline, cause the deterioration of vector network analyzer low-frequency range dynamic range;
2, receiver isolation is low: because low-frequency range and high band share same low noise amplifier and slope attenuator, cause receiver to have different isolations in different frequency ranges, cannot meet the consistency of measurement;
3, low-band signal interference if sampling signal: when low-band signal mixing, due to tested low frequency signal with 3, frequency range residing for the intermediate-freuqncy signal of sampling is very close, the low frequency signal causing radio-frequency head to receive interferes with the quality of intermediate-freuqncy signal, thus affects low-frequency test result.
Summary of the invention
The object of the invention is to overcome the above-mentioned defect existed in prior art, a kind of a kind of wide-band width measurement method that the present invention proposes binary channels broadband receiver for vector network analyzer is provided, solve and introduce much noise because of low frequency end down-conversion in wide-band width measurement, cause low-frequency range dynamic range cannot reach consistent with high band.At low-frequency range (within 10MHz), adopt ADC Direct Sampling, vector network analyzer is made to obtain higher dynamic range in low-frequency range, at high band, by broadband frequency mixing technique, through a down-conversion, obtain fixed intermediate frequency sampled signal, then carry out ADC sampling, which enhance the scope that high band can be measured.By low-frequency range passage and high band passage, make vector network analyzer can have very wide frequency band range.
For achieving the above object, the wide-band width measurement method of the binary channels broadband receiver for vector network analyzer that the present invention proposes, comprises the following steps:
Step one: radiofrequency signal RF enters receiver through radio-frequency (RF) front-end circuit, enters low channel and hf channel respectively through power splitter.Low channel directly enters 2 and selects 1 switch, and hf channel enters 2 and selects 1 switch after process mixing;
Step 2: FPGA channel control circuit judge current need sampling signalling channel, and control 2 select 1 switch select required for passage;
Step 3: enter in A/D converter through 2 signals selecting 1 switch to select and carry out sampling processing, this process adopts oversampling technique, and fixed sampling frequency is 60MHz.
In technique scheme, in described step one, described low channel and hf channel obtain the intermediate-freuqncy signal that can sample through different modes, low channel Direct Sampling, hf channel obtains intermediate-freuqncy signal and samples after down-conversion, achieves the function of vector network analyzer broadband receiver.
In technique scheme, in described step 2, described FPGA channel control circuit controls the current residing passage of vector network analyzer receiver, achieves the automatic control of channel selecting, adds the isolation between low channel and hf channel.
In technique scheme, in described step 3, described employing over-sampling treatment technology, fixed sampling frequency is 60MHz, achieves the unification of two channel sample frequencies, improves bandwidth processing gain, ensure the consistency of dynamic range between two passages.
Vector network analyzer needs very wide frequency range when measuring, requirements vector network analyzer can disposable test more low frequency and higher frequency, the vector network analyzer of present use adopts down-conversion technique when testing low frequency signal, much noise is introduced when down-conversion, the dynamic range identical with high band cannot be reached in low-frequency range, cannot uniformity test be met in test process.The present invention has following beneficial effect compared with prior art:
1, improve the frequency range of vector network analyzer receiver, low channel Direct Sampling, ensure the sensitivity of receiver low frequency end; Hf channel by casacade multi-amplifier cascade and down-conversion, realizes high-gain and more great dynamic range;
2, passage identifies control automatically, adds FPGAFPGA channel control circuit and 2 and selects 1 switch, realizes the automatic identification of low channel and hf channel, and introduce 2 select 1 switch to add isolation between two passages simultaneously;
3, adopt radio frequency circuit board scheme, structure is simple and easy to use, and antijamming capability is strong.
Accompanying drawing explanation
Fig. 1 is a kind of binary channels broadband receiver schematic diagram being applied to vector network analyzer of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The binary channels broadband receiver schematic diagram being applied to vector network analyzer as shown in Figure 1, receiver is made up of radio-frequency front-end receiving circuit, digital sample and processing circuitry of intermediate frequency, the large core circuit of FPGA channel control circuit three.The radiofrequency signal RF that radio-frequency front-end receiving circuit receives for receiving also processing vector network analyzer test port; A/D converter circuit is used for treated radiofrequency signal RF to be converted to digital signal; FPGA channel control circuit is used for automatically selecting required passage according to the signal frequency range of vector network analyzer test port;
2. radio-frequency front-end receiving circuit is for the treatment of received radiofrequency signal RF, comprises low channel and hf channel.Radiofrequency signal RF, through the process of first order low noise amplifier, enters low channel or hf channel at power splitter place.Low channel frequency range is 100kHz to 10MHz, and this low frequency signal directly enters 2 through Low Noise and Low Frequency Amplifier and low pass filter and selects 1 switch; Hf channel frequency range is 10MHz to 8.5GHz, this signal enters frequency mixer through second level low noise amplifier and slope attenuator, with local oscillation signal L0 mixing, radiofrequency signal RF and local oscillation signal L0 frequency phase-difference 7.6MHz, so obtain if sampling signal 7.6MHz after mixing, enter 2 and select 1 switch.
3.FPGA channel control circuit is for selecting the signal in low channel or hf channel.The RF band that FPGA channel control circuit receives from host computer judges signal, controls 2 and selects 1 switch to select corresponding passage.When signal is in 100kHz to 10MHz, 2 select 1 switch to select low channel, and now hf channel is in high isolation; When signal is in 10MHz to 8.5GHz, 2 select 1 switch to select hf channel, and now low channel is in high isolation.Vector network analyzer achieves being separated of low frequency signal and high-frequency signal by FPGA channel control circuit, adds the isolation of complete machine.
4. digital sample and processing circuitry of intermediate frequency are used for the intermediate-freuqncy signal that sampling processing 2 selects 100kHz to the 10MHz in 1 switch.At the signal of low channel 100kHz to 10MHz, directly carry out sampling processing; The 7.6MHz intermediate-freuqncy signal obtained after hf channel 10MHz to 8.5GHz sampling processing down-conversion.For low channel and hf channel, sample frequency is unified adopts 60MHz, under A/D converter is operated in over-sampling state, which increases bandwidth processing gain, improves dynamic range simultaneously.Carry out digital down-conversion technology to the signal after sampling, isolate I and Q two paths of signals, the noise introduced relative to analog down technology is lower.
The wide-band width measurement method of the binary channels broadband receiver for vector network analyzer in Fig. 1 comprises the steps:
Step one: radiofrequency signal RF enters receiver through radio-frequency (RF) front-end circuit, enters low channel and hf channel respectively through power splitter.Low channel directly enters 2 and selects 1 switch, and hf channel enters 2 and selects 1 switch after process mixing.Described low channel and hf channel obtain the intermediate-freuqncy signal that can sample through different modes, low channel Direct Sampling, and hf channel obtains intermediate-freuqncy signal and samples after down-conversion, achieves the function of vector network analyzer broadband receiver.
Step 2: FPGA channel control circuit judge current need sampling signalling channel, and control 2 select 1 switch select required for passage.Described FPGA channel control circuit controls the current residing passage of vector network analyzer receiver, achieves the automatic control of channel selecting, adds the isolation between low channel and hf channel.
Step 3: enter in A/D converter through 2 signals selecting 1 switch to select and carry out sampling processing, this process adopts oversampling technique, and fixed sampling frequency is 60MHz.Described employing over-sampling treatment technology, fixed sampling frequency is 60MHz, achieves the unification of two channel sample frequencies, improves bandwidth processing gain, ensure the consistency of dynamic range between two passages.
The invention solves and introduce much noise because of low frequency end down-conversion in wide-band width measurement, cause low-frequency range dynamic range cannot reach consistent with high band.At low-frequency range (within 10MHz), adopt ADC Direct Sampling, vector network analyzer is made to obtain higher dynamic range in low-frequency range, at high band, by broadband frequency mixing technique, through a down-conversion, obtain fixed intermediate frequency sampled signal, then carry out ADC sampling, which enhance the scope that high band can be measured.By low-frequency range passage and high band passage, make vector network analyzer can have very wide frequency band range.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1., for a wide-band width measurement method for the binary channels broadband receiver of vector network analyzer, it is characterized in that, comprise the following steps:
Step one: radiofrequency signal RF enters receiver through radio-frequency (RF) front-end circuit, enters low channel and hf channel respectively through power splitter.Low channel signal directly enters 2 and selects 1 switch, and hf channel signal enters 2 and selects 1 switch after process mixing;
Step 2: FPGA channel control circuit judge current need sampling signalling channel, and control 2 select 1 switch select required for passage;
Step 3: enter in A/D converter through 2 signals selecting 1 switch to select and carry out sampling processing, this process adopts oversampling technique, and fixed sampling frequency is 60MHz.
2. according to claim 1 for the wide-band width measurement method of the binary channels broadband receiver of vector network analyzer, it is characterized in that: in described step one, described low channel and hf channel obtain the intermediate-freuqncy signal that can sample through different modes, low channel signal Direct Sampling, hf channel signal obtains intermediate-freuqncy signal and samples after down-conversion, achieves the function of vector network analyzer broadband receiver.
3. according to claim 1 for the wide-band width measurement method of the binary channels broadband receiver of vector network analyzer, it is characterized in that: in described step 2, described FPGA channel control circuit controls the current residing passage of vector network analyzer receiver, achieve the automatic control of channel selecting, add the isolation between low channel and hf channel.
4. according to claim 1 for the wide-band width measurement method of the binary channels broadband receiver of vector network analyzer, it is characterized in that: in described step 3, described employing over-sampling treatment technology, fixed sampling frequency is 60MHz, achieve the unification of two channel sample frequencies, improve bandwidth processing gain, ensure the consistency of dynamic range between two passages.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107222178A (en) * | 2017-06-05 | 2017-09-29 | 中国电子科技集团公司第四十研究所 | A kind of vector network analyzer receiving channel gain control and method |
| CN109245831A (en) * | 2018-08-29 | 2019-01-18 | 成都天大仪器股份有限公司 | low frequency-radio frequency network analyzer |
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| CN109245831A (en) * | 2018-08-29 | 2019-01-18 | 成都天大仪器股份有限公司 | low frequency-radio frequency network analyzer |
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