CN103592547A - Wideband vector network analyzer - Google Patents
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Abstract
The invention discloses a wideband vector network analyzer. The wideband vector network analyzer is characterized by adopting a frequency slicing method and divides a test frequency range into three frequency bands, namely a low frequency band, a radio frequency band and a microwave band, and an excitation signal generation method, a test signal directional separation method and a frequency conversion receiving method of each frequency band are different. The wideband vector network analyzer is composed of a network analysis module, a 6GHz-20GHz front-end module and a 6G front-end module on the whole, wherein the network analysis module comprises an excitation signal source submodule, a fixed local oscillator module, a local oscillator signal source submodule and a medium frequency processing submodule, the 6GHz-20GHz front-end module and the 6G front-end module are connected, share a 6-20G front-end module test port, and are respectively connected to the network analysis module, and therefore the interaction among the 6GHz-20GHz front-end module, the 6G front-end module and submodules of the network analysis module is achieved. The wideband vector network analyzer adopt the measuring frequency slicing method, enables the processing of different frequency bands to be mutually independent, effectively avoids the difficulties in the design of low-frequency measurement and high-frequency measurement on the condition of small size, and achieves a wider frequency measurement range.
Description
Technical field
The present invention relates to a kind of wideband vector network analyzer.
Background technology
Vector network analyzer is the most frequently used testing apparatus in microwave measurement field, is widely used in a plurality of field tests such as radar, electronic countermeasure, radio station and microwave device.Current wideband vector network analyzer is generally the desktop computer of larger volume, is unfavorable for on-the-spot test, in the urgent need to development small size, hand-held broadband test instrument easy to carry.In network test system, conventionally use the signal discrete device of directional coupler, therefore the bandwidth of operation of directional coupler has directly determined the test bandwidth of instrument, owing to being subject to restriction and the impact of transmission path on radiofrequency signal of directional coupler design size, be difficult on handheld instrument to realize from low frequency very to very high-frequency measurement.
The hand-held vector network analyzer survey frequency scope low side of comparative maturity is generally 2MHz at present, high-endly can reach 6GHz or higher, its implementation is: pumping signal, by exciting signal source VCO, the upper and lower frequency conversion of signal occurs and mixing obtains, test signal is carried out separation by broadband dual directional coupler, then carry out fundamental wave mixing with local oscillation signal, realize after frequency conversion receives and carry out intermediate frequency process.This implementation structure is comparatively compact, but it is more difficult to expand working band.If realize 5KHz～20GHz based on this scheme, vow net analyser, the one, will greatly increase the design difficulty of directional coupler, because operating frequency range is from radio frequency span to microwave, frequency band surpasses a plurality of octaves, wants guaranteed performance index and keep very difficulty of smaller size smaller in so wide frequency range; The 2nd, transmission path certainly will exert an influence to high frequency band signal, and because operating frequency range span is larger, if whole frequency range is processed simultaneously, very high to passage requirement, design difficulty is larger.
In sum, vector network analyzer of the prior art needs further to improve.
Summary of the invention
Task of the present invention is to solve the technological deficiency that in prior art, vector network analyzer exists, and a kind of wideband vector network analyzer is provided.
Its technical solution is:
A kind of wideband vector network analyzer, comprise that nework analysis module, 6～20G front-end module and 6G front-end module form, nework analysis module comprises again exciting signal source submodule, fixedly local oscillator submodule, local oscillation signal source submodule and intermediate frequency process submodule, 6GHz～20GHz front-end module is connected with 6G front-end module, share 6～20G front-end module test port, two front-end modules are connected to respectively nework analysis module, realize with each submodule of nework analysis module between alternately.Proportion segmented mode, is divided into low frequency, radio frequency, three frequency ranges of microwave by test frequency scope, and pumping signal generation, test signal directional separation and the frequency conversion method of reseptance of each frequency range are different.Some modules wherein and/or submodule can form with lower unit:
Pumping signal generating unit, it is for producing respectively the pumping signal of each frequency range: upper and lower frequency conversion and the mixing by exciting signal source submodule produces at nework analysis module for low-frequency range and radio band pumping signal.Wherein, low-frequency range pumping signal directly adds to port by bias inductors, and first radio band pumping signal delivers to 6G front-end module, after the processing such as gain, filtering, adds to port; Tuning 6～20G the front-end module of the reference signal VCO that microwave section pumping signal provides by nework analysis module occurs, then adds to test port after treatment in front-end module.
Test signal directional separation unit, it is for realizing respectively the separated of three frequency range test signal transmission waves and reflection wave: due to very large to 20GHz signal wavelength span from 5KHz, adopt the mode of staging treating can reduce under small size directional coupler design difficulty and obtain better performance index.Wherein, low-frequency range test signal is processed at 6G front-end module, according to the phase relation between forward and reverse signal, by the mimic channel consisting of amplifier, realizes directional separation; Radio band test signal is carried out separating treatment at 6G front-end module equally, different from low-frequency range, and this frequency range test signal has adopted bridge type dual directional coupler as discrete device; Microwave section test signal is processed at 6～20G front-end module, because this segment signal frequency is higher, has adopted micro-band plane formula dual directional coupler to carry out separated forward and reverse signal.
Test signal frequency conversion receiving element, it is for being converted to fixed intermediate frequency by three frequency range test signals: after test signal is isolated transmission wave and reflection wave, need to be converted to fixed intermediate frequency, then deliver to nework analysis module intermediate frequency process submodule and carry out subsequent treatment, the signal at this to three frequency ranges has adopted different conversion systems.Wherein, radio band test signal is processed at 6G front-end module, adopts sampling frequency mixing method, the 2MHz～60MHz frequency providing with comb spectrum sampling local oscillation signal source submodule, by its frequency multiplication to required frequency again with separation signal mixing, be converted to fixed intermediate frequency; Microwave section test signal is processed at 6～20G front-end module, adopts harmonic mixing method, and the N subharmonic of getting 2GHz～4GHz local oscillation signal that local oscillation signal source submodule provides carries out mixing with separated rear signal, is converted to fixed intermediate frequency; Low-frequency range test signal is processed at nework analysis module, after separated, signal is first through Hilbert filtering, take advantage of to add with orthogonal local oscillation and carry out up-conversion, then with the output down coversion of fixing local oscillator submodule after frequency carry out mixing, be converted to fixed intermediate frequency.
The present invention has following useful technique effect:
One, the present invention adopts survey frequency staging treating method, each frequency range is processed separate, effectively avoided the difficult point in the design of low frequency measurement and high frequency measurement under small size condition, realized wider frequency measurement scope, and more easily obtained better performance index compared with full frequency band processing mode.
Two, medium and low frequency section of the present invention adopts mimic channel to realize signal separation, radio band and microwave section have adopted bridge type and micro-band plane formula dual directional coupler successively according to frequency characteristic, efficiently solve the restriction in directional coupler design size, structure is compacter, has realized from low frequency very to very high-frequency measurement when reducing design difficulty.
Three, radio band of the present invention and microwave segment signal concentrate on front-end module and process, and nework analysis module is directly processed intermediate-freuqncy signal, has reduced signal transmission, has solved the impact of transmission path on radiofrequency signal, can realize the measurement of higher frequency.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further described:
Fig. 1 is the schematic block diagram of one embodiment of the present invention.
Fig. 2 is exciting signal source submodule in the present invention and the principle of work schematic block diagram of local oscillation signal source submodule.
Fig. 3 is the schematic block diagram of the 6G front-end module in the present invention.
Fig. 4 is the schematic block diagram of the 6～20G front-end module in the present invention.
Fig. 5 is the low-band signal occurring principle schematic diagram in the present invention.
Fig. 6 is the low-band signal record principle schematic diagram in the present invention.
Embodiment
In conjunction with Fig. 1, a kind of wideband vector network analyzer, comprise nework analysis module, 6GHz～20GHz front-end module and 6GHz front-end module, nework analysis module comprises exciting signal source submodule, fixedly local oscillator submodule, local oscillation signal source submodule and intermediate frequency process submodule, 6～20G front-end module is connected with 6G front-end module, share 6～20G front-end module test port, i.e. the first test port and the second test port.Two front-end modules are connected to respectively nework analysis module, realize with each submodule of nework analysis module between alternately.
Above-mentioned exciting signal source submodule be mainly responsible for to produce 5KHz～6GHz low-frequency range and radio band pumping signal, and provides tuning voltage for 6～20G front-end module VCO; Local oscillation signal source submodule mainly participates in frequency conversion receiving course, the local oscillation signal producing with separated after signal carry out mixing and faded to fixed intermediate frequency to carry out subsequent treatment.As shown in Figure 2, radio frequency VCO produces 1.5G～3G signal and is divided into three tunnels, one tunnel is through repeatedly frequency division and mixing cover 5KHz～1.5GHz frequency band, one tunnel produces 3G～6G frequency band signals through frequency multiplication and filtering, and 1.5GHz～3GHz frequency band signal of adding direct generation can provide the pumping signal that covers 5KHz～6GHz.Radio frequency VCO provides a road reference signal to local oscillation signal source phaselocked loop simultaneously, after local oscillator VCO locking, will produce two paths of signals and participate in frequency conversion reception, one tunnel directly offers 6～20G front-end module, i.e. H_LO signal in figure, an other road offers 6G front-end module after down coversion, i.e. L_LO signal in figure.
Separation and the frequency conversion reception & disposal process of 2MHz～6GHz radio band test signal complete at 6G front-end module.As shown in Figure 3, L_P1 and L_P2 are two test ports, the radio-frequency (RF) excited producing from nework analysis module is that L_RF signal is added on test port after the processing such as gain, test signal is by bridge type dual directional coupler separated transmission ripple and reflection wave, obtain A, B, R signal, 2MHz～60MHz local oscillation signal that the test signal obtaining is come with local oscillation signal source submodule frequency division subsequently samples mixing, be converted to fixed intermediate frequency, be the IF_A in Fig. 3, IF_R1 and IF_B, IF_R2 signal, difference corresponding first, the second test port, these intermediate-freuqncy signals enter nework analysis module, to carry out follow-up intermediate frequency process.
The processing procedures such as pumping signal generation, test signal directional separation and the frequency conversion reception of 6GHz～20GHz microwave section all complete at 6～20G front-end module.As shown in Figure 4, nework analysis module provides tuning voltage and reference to this front-end module VCO, produce 5GHz～10GHz frequency band signals, this signal again through frequency multiplier frequency multiplication to 10GHz～20GHz frequency range, the signal after frequency multiplication and original signal are connected mutually can provide the pumping signal that covers 6GHz～20GHz.This pumping signal adds to test port after the processing such as gain, test signal is by micro-band plane formula dual directional coupler separated transmission ripple and transmitted wave, 2GHz～4GHz signal that signal after separation provides with local oscillation signal source submodule carries out harmonic mixing, be converted to fixed intermediate frequency, obtain A, B, the R signal of corresponding two ports, i.e. H_IFA in figure, H_IFR1 and H_IFB, H_IFR2.
5K～6GHz low-frequency range and radio band excitation are provided by exciting signal source submodule.In conjunction with Fig. 5, 1.5G～3GHz signal that exciting signal source submodule VCO produces produces 0.75G～1.5GHz successively through three down coversions, 187.5M～0.75GHz, 46.875M～187.5MHz frequency band signal, 46.875M～187.5MHz frequency band signal carries out fractional frequency division by CPLD, obtain 2M～46.875MHz frequency band signal, merge and produce the signal that can cover 2MHz～187.5MHz frequency band with original signal, then this signal is divided into two-way, one road signal returns, merge with the signal of three grades of frequency divisions generations of exciting signal source submodule successively, obtain 2MHz～1.5GHz frequency band signal, again with the 1.5G～3GHz of exciting signal source submodule generation itself and 3G～6GHz signal splicing of frequency multiplication generation thereof, realizing 2MHz～6GHz radio band pumping signal occurs, 42.8M～50.8MHz frequency band signal is selected on another road, by the divide by four circuit being formed by double D trigger, obtain 10.7M～12.7MHz frequency band signal, this signal carries out mixing with the 85.6MHz 10.7MHz signal that fixedly local oscillator submodule eight frequency divisions produce again, realizes 5KHz～2MHz low-frequency range pumping signal and occurs.
5KHz～2MHz low-frequency range test signal directional separation is realized at 6G front-end module equally, if 5KHz～2MHz frequency range and the merging of 2MHz～6GHz radio band signal are carried out to directional separation processing, directional coupler design difficulty be certainly will strengthen, design size and performance index are difficult to take into account.Therefore, this unit, by 5KHz～2MHz test signal independent processing, according to the phase relation between transmission wave and reflection wave, adopts the mimic channel consisting of amplifier to realize signal separation.
5KHz～2MHz low-band signal frequency conversion receiving course completes at nework analysis module.In conjunction with Fig. 6, in conversion process, test signal has been carried out to up-conversion and down coversion successively.Test signal after separation is first by the Hilbert filtering circuit being comprised of amplifier, obtain mutually orthogonal I, Q road signal, then multiply each other and add with orthogonal local oscillation LO_I, the LO_Q of 10.7M, realize that zero-frequency suppresses and by test signal up-conversion to 10.7MHz, again with the fixed frequency of 10.9M carry out mixing thereafter, be converted to 200K fixed intermediate frequency, realize signal and receive.Wherein, the orthogonal local oscillation of 10.7M is in low-frequency range pumping signal generating process, and the divide by four circuit being comprised of double D trigger obtains during to 42.8MHz signal down coversion.
The relevant technologies content of not addressing in aforesaid way is taked or is used for reference prior art and can realize.
It should be noted that, under the instruction of this instructions, those skilled in the art can also make such or such easy variation pattern, such as equivalent way, or obvious mode of texturing.Above-mentioned variation pattern all should be within protection scope of the present invention.
Claims (3)
1. a wideband vector network analyzer, it is characterized in that comprising nework analysis module, 6GHz～20GHz front-end module and 6GHz front-end module, nework analysis module comprises exciting signal source submodule, fixedly local oscillator submodule, local oscillation signal source submodule and intermediate frequency process submodule, 6GHz～20GHz front-end module is connected with 6G front-end module, share 6～20G front-end module test port, two front-end modules are connected to respectively nework analysis module, realize with each submodule of nework analysis module between alternately.
2. wideband vector network analyzer according to claim 1, it is characterized in that 5KHz～20GHz survey frequency scope to be divided into low frequency, radio frequency, three frequency ranges of microwave, the characteristic different according to each frequency range, adopts different pumping signal generation, test signal directional separation and frequency conversion method of reseptance.
3. wideband vector network analyzer according to claim 1, is characterized in that having formed following processing unit by some modules and/or submodule wherein:
Pumping signal generating unit, it is for producing respectively the pumping signal of each frequency range: upper and lower frequency conversion and the mixing by exciting signal source submodule produces at nework analysis module for low frequency and radio band pumping signal; Wherein, low-frequency range pumping signal directly adds to port by bias inductors, and first radio band pumping signal delivers to 6G front-end module, after the processing such as gain, filtering, adds to port; Tuning 6～20G the front-end module of the reference signal VCO that microwave section pumping signal provides by nework analysis module occurs, then adds to test port after treatment in front-end module;
Test signal directional separation unit, it is for realizing respectively the separated of three frequency range test signal transmission waves and reflection wave: due to very large to 20GHz signal wavelength span from 5KHz, the mode that adopts staging treating is in order to reduce under small size directional coupler design difficulty and to obtain better performance index; Wherein, low-frequency range test signal is processed at 6G front-end module, according to the phase relation between forward and reverse signal, by the mimic channel consisting of amplifier, realizes directional separation; Radio band test signal is carried out separating treatment at 6G front-end module equally, different from low-band signal, and this frequency range test signal has adopted bridge type dual directional coupler as discrete device; Microwave frequency band test signal is processed at 6～20G front-end module, because this segment signal frequency is higher, has adopted micro-band plane formula dual directional coupler to carry out separated forward and reverse signal;
Test signal frequency conversion receiving element, it is for being converted to fixed intermediate frequency by three frequency range test signals: after test signal is isolated transmission wave and reflection wave, need to be converted to fixed intermediate frequency, then deliver to nework analysis module intermediate frequency process submodule and carry out subsequent treatment, the signal at this to three frequency ranges has adopted different conversion systems; Wherein, radio band test signal is processed at 6G front-end module, adopts sampling frequency mixing method, the 2MHz～60MHz frequency providing with comb spectrum sampling local oscillation signal source submodule, by its frequency multiplication to required frequency again with separation signal mixing, be converted to fixed intermediate frequency; Microwave section test signal is processed at 6～20G front-end module, adopts harmonic mixing method, and the N subharmonic of getting 2GHz～4GHz local oscillation signal that local oscillation signal source submodule provides carries out mixing with separated rear signal, is converted to fixed intermediate frequency; Low-frequency range test signal is processed at nework analysis module, after separated, signal is first through Hilbert filtering, take advantage of to add with orthogonal local oscillation and carry out up-conversion, then with the output down coversion of fixing local oscillator submodule after frequency carry out mixing, be converted to fixed intermediate frequency.
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Cited By (10)
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| CN104320150A (en) * | 2014-10-24 | 2015-01-28 | 上海无线电设备研究所 | Ultra-wideband microwave receiver and signal segment processing method thereof |
| CN106199188A (en) * | 2016-07-20 | 2016-12-07 | 中国科学院紫金山天文台 | A kind of device and method utilizing the change of removal cable phase place in circulator calibration vector field measurement |
| CN106301625A (en) * | 2016-08-26 | 2017-01-04 | 北京信维科技股份有限公司 | A kind of antenna feeder test and arrangements for analyzing frequency |
| CN106841840A (en) * | 2016-11-24 | 2017-06-13 | 中国电子科技集团公司第四十研究所 | A kind of data processing method of low-frequency range variable intermediate frequency |
| CN107911103A (en) * | 2017-12-04 | 2018-04-13 | 中国电子科技集团公司第四十研究所 | It is a kind of to use the 1MHz 6GHz signal generating circuits divided entirely and method |
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| CN109490737A (en) * | 2018-10-26 | 2019-03-19 | 中电科仪器仪表有限公司 | The automatic test all-purpose method and device of microwave semiconductor device frequency expansion multi-parameter |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104320150A (en) * | 2014-10-24 | 2015-01-28 | 上海无线电设备研究所 | Ultra-wideband microwave receiver and signal segment processing method thereof |
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| CN106199188A (en) * | 2016-07-20 | 2016-12-07 | 中国科学院紫金山天文台 | A kind of device and method utilizing the change of removal cable phase place in circulator calibration vector field measurement |
| CN106199188B (en) * | 2016-07-20 | 2019-01-18 | 中国科学院紫金山天文台 | A kind of device and method using removal cable phase change in circulator calibration vector field measurement |
| CN106301625B (en) * | 2016-08-26 | 2018-07-06 | 北京信维科技股份有限公司 | A kind of antenna feeder test and arrangements for analyzing frequency |
| CN106301625A (en) * | 2016-08-26 | 2017-01-04 | 北京信维科技股份有限公司 | A kind of antenna feeder test and arrangements for analyzing frequency |
| CN106841840A (en) * | 2016-11-24 | 2017-06-13 | 中国电子科技集团公司第四十研究所 | A kind of data processing method of low-frequency range variable intermediate frequency |
| CN107911103A (en) * | 2017-12-04 | 2018-04-13 | 中国电子科技集团公司第四十研究所 | It is a kind of to use the 1MHz 6GHz signal generating circuits divided entirely and method |
| CN107911103B (en) * | 2017-12-04 | 2020-12-18 | 中国电子科技集团公司第四十一研究所 | 1MHz-6GHz signal generating circuit and method adopting full frequency division |
| CN108614207A (en) * | 2018-05-23 | 2018-10-02 | 中国电子科技集团公司第四十研究所 | A kind of the signal source switching device and method of vector network analyzer |
| CN109307813A (en) * | 2018-10-10 | 2019-02-05 | 南京冉亚电子技术有限公司 | A kind of measurement frequency expansion method and device based on vector network analyzer |
| CN109490737A (en) * | 2018-10-26 | 2019-03-19 | 中电科仪器仪表有限公司 | The automatic test all-purpose method and device of microwave semiconductor device frequency expansion multi-parameter |
| 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 |
| CN114441889A (en) * | 2022-04-02 | 2022-05-06 | 深圳市鼎阳科技股份有限公司 | Network analyzer, harmonic wave testing method and storage medium |
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