CN103592547B - A kind of wideband vector network analyzer - Google Patents
A kind of wideband vector network analyzer Download PDFInfo
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Abstract
The invention discloses a kind of wideband vector network analyzer, feature adopts frequency segmentation mode, test frequency scope is divided into low frequency, radio frequency, microwave three frequency ranges, the pumping signal of each frequency range occurs, test signal directional separation and frequency conversion method of reseptance different.Instrument is made up of nework analysis module, 6 ~ 20G front-end module and 6G front-end module generally, nework analysis module comprises again exciting signal source submodule, fixing 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 nework analysis module respectively, realize with each submodule of nework analysis module between mutual.The present invention adopt survey frequency staging treating mode, make the process of different frequency range separate, effectively prevent low frequency measurement and high frequency measurement under small size condition design in difficult point, achieve wider frequency measurement scope.
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 multiple 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, the signal discrete device of usual use directional coupler, therefore the bandwidth of operation of directional coupler directly determines the test bandwidth of instrument, due to by the restriction of directional coupler design size and the impact of transmission path radio frequency signal, be difficult to realize on handheld instrument from very low frequency to very high-frequency measurement.
The hand-held vector network analyzer survey frequency scope low side of current comparative maturity is generally 2MHz, high-endly 6GHz or higher can be reached, 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 separated by broadband dual directional coupler, then carry out fundamental wave mixing with local oscillation signal, realize carrying out intermediate frequency process after frequency conversion receives.This implementation structure is comparatively compact, but it is more difficult to expand working band.If realize 5KHz ~ 20GHz based on this scheme to vow net analyser, one is the design difficulty by greatly increasing directional coupler, because operating frequency range is from radio frequency span to microwave, frequency band exceedes multiple octave, wants guaranteed performance index and keep smaller size smaller by very difficult in so wide frequency range; Two is that transmission path certainly will have an impact to high frequency band signal, and because operating frequency range span is comparatively large, if whole frequency range processes simultaneously, very high to channel requirements, 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 provides a kind of wideband vector network analyzer.
Its technical solution is:
A kind of wideband vector network analyzer, comprise nework analysis module, 6 ~ 20G front-end module and 6G front-end module to form, nework analysis module comprises again exciting signal source submodule, fixing 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 nework analysis module respectively, realize with each submodule of nework analysis module between mutual.Adopt frequency segmentation mode, test frequency scope be divided into low frequency, radio frequency, microwave three frequency ranges, the pumping signal of each frequency range occurs, test signal directional separation and frequency conversion method of reseptance different.Some modules wherein and/or submodule can be formed with lower unit:
Pumping signal generating unit, it is for producing the pumping signal of each frequency range respectively: low-frequency range and radio band pumping signal pass through upper and lower frequency conversion and the mixing generation of exciting signal source submodule at nework analysis module.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 process such as gain, filtering, add to port; Reference signal tuning 6 ~ 20G front-end module VCO that microwave section pumping signal is provided 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 being separated of three frequency range test signal transmission waves and reflection wave respectively: because from 5KHz to 20GHz, signal wavelength span is very large, adopts the mode of staging treating can reduce directional coupler design difficulty under small size and obtain better performance index.Wherein, low-frequency range test signal processes at 6G front-end module, according to the phase relation between forward and reverse signal, realizes directional separation by the mimic channel be made up of amplifier; Radio band test signal carries out separating treatment at 6G front-end module equally, different from low-frequency range, and this frequency range test signal have employed bridge type dual directional coupler as discrete device; Microwave section test signal processes at 6 ~ 20G front-end module, because this segment signal frequency is higher, have employed micro-band plane formula dual directional coupler to be 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 isolates 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, at this, different conversion systems be have employed to the signal of three frequency ranges.Wherein, radio band test signal processes at 6G front-end module, adopts sampling frequency mixing method, the 2MHz ~ 60MHz frequency provided 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 processes at 6 ~ 20G front-end module, adopts harmonic mixing method, the N subharmonic getting 2GHz ~ 4GHz local oscillation signal that local oscillation signal source submodule provides be separated rear signal and carry out mixing, be converted to fixed intermediate frequency; Low-frequency range test signal processes at nework analysis module, after being separated, signal is first through Hilbert filter, 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 Advantageous Effects:
One, the present invention adopts survey frequency staging treating method, each frequency range process is separate, effectively prevent low frequency measurement and high frequency measurement under small size condition design in difficult point, achieve wider frequency measurement scope, and comparatively full frequency band processing mode more easily obtains better performance index.
Two, medium and low frequency section of the present invention adopts mimic channel to realize Signal separator, radio band and microwave section have employed 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, achieves from very low frequency to very high-frequency measurement while reduction design difficulty.
Three, radio band of the present invention and microwave segment signal concentrate on front-end module and process, and nework analysis module directly processes intermediate-freuqncy signal, decreases Signal transmissions, solves the impact of transmission path radio frequency 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 the principle of work schematic block diagram of exciting signal source submodule in the present invention and 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
Composition graphs 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, fixing 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 nework analysis module respectively, realize with each submodule of nework analysis module between mutual.
Above-mentioned exciting signal source submodule primary responsibility produces 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 produced be 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, adds the 1.5GHz ~ 3GHz frequency band signals directly produced and can provide the pumping signal covering 5KHz ~ 6GHz.Radio frequency VCO provides a road reference signal to local oscillation signal source phaselocked loop simultaneously, two paths of signals will be produced after local oscillator VCO locking and participate in frequency conversion reception, one tunnel is directly supplied to 6 ~ 20G front-end module, namely the H_LO signal in figure, an other road is supplied to 6G front-end module after down coversion, the L_LO signal namely in figure.
The separation of 2MHz ~ 6GHz radio band test signal and frequency conversion receive processing procedure and complete at 6G front-end module.As shown in Figure 3, L_P1 and L_P2 is two test ports, the radio-frequency (RF) excited produced from nework analysis module and L_RF signal are added to test port after the process 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 obtained is come with local oscillation signal source submodule frequency division subsequently carries out sampling mixing, be converted to fixed intermediate frequency, namely the IF_A in Fig. 3, IF_R1 and IF_B, IF_R2 signal, correspondence first respectively, second test port, these intermediate-freuqncy signals enter nework analysis module, to carry out follow-up intermediate frequency process.
The processing procedures such as the pumping signal of 6GHz ~ 20GHz microwave section occurs, test signal directional separation and frequency conversion reception 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 the pumping signal that can provide and cover 6GHz ~ 20GHz mutually.This pumping signal adds to test port after the process 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, H_IFA, H_IFR1 and H_IFB namely in figure, H_IFR2.
5K ~ 6GHz low-frequency range and radio band excitation are provided by exciting signal source submodule.Composition graphs 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 signals, 46.875M ~ 187.5MHz frequency band signals carries out fractional frequency division by CPLD, obtain 2M ~ 46.875MHz frequency band signals, the signal producing and can cover 2MHz ~ 187.5MHz frequency band is merged with original signal, then this signal is divided into two-way, one road signal returns, the signal produced with exciting signal source submodule three grades of frequency divisions successively merges, obtain 2MHz ~ 1.5GHz frequency band signals, 3G ~ 6GHz signal that the 1.5G ~ 3GHz occurred with exciting signal source submodule itself again and frequency multiplication thereof produce splices, realize 2MHz ~ 6GHz radio band pumping signal to occur, 42.8M ~ 50.8MHz frequency band signals is selected on another road, by the divide by four circuit be made up of double D trigger, obtain 10.7M ~ 12.7MHz frequency band signals, this signal is fixed the 10.7MHz signal that local oscillator submodule eight frequency division produces again and is carried out mixing with 85.6MHz, realize 5KHz ~ 2MHz low-frequency range pumping signal and occur.
5KHz ~ 2MHz low-frequency range test signal directional separation realizes at 6G front-end module equally, if 5KHz ~ 2MHz frequency range and 2MHz ~ 6GHz radio band signal are merged and carry out directional separation process, directional coupler design difficulty certainly will be strengthened, be difficult to take into account design size and performance index.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 be made up of amplifier to realize Signal separator.
5KHz ~ 2MHz low-band signal frequency conversion receiving course completes at nework analysis module.Composition graphs 6, in conversion process, has carried out up-conversion and down coversion successively to test signal.The Hilbert filter circuit of test signal after separation first by being made up of amplifier, obtain mutually orthogonal I, Q road signal, then be multiplied with orthogonal local oscillation LO_I, LO_Q of 10.7M and add, realize zero-frequency suppress and by test signal up-conversion to 10.7MHz, thereafter mixing is carried out with the fixed frequency of 10.9M again, be converted to 200K fixed intermediate frequency, realize Signal reception.Wherein, the orthogonal local oscillation of 10.7M is in low-frequency range pumping signal generating process, and the divide by four circuit be made up of double D trigger is to obtaining during 42.8MHz signal down coversion.
The relevant technologies content do not addressed in aforesaid way is taked or uses for reference prior art to 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 within protection scope of the present invention.
Claims (1)
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, fixing local oscillator submodule, local oscillation signal source submodule and intermediate frequency process submodule, 6GHz ~ 20GHz front-end module is connected with 6GHz front-end module, share 6GHz ~ 20GHz front-end module test port, two front-end modules are connected to nework analysis module respectively, realize with each submodule of nework analysis module between mutual;
5KHz ~ 20GHz survey frequency scope is divided into low frequency, radio frequency, microwave three frequency ranges, the characteristic different according to each frequency range, adopts different pumping signal generations, test signal directional separation and frequency conversion method of reseptance;
Following processing unit is constituted by some modules wherein and/or submodule:
Pumping signal generating unit, it is for producing the pumping signal of each frequency range respectively: low frequency and radio band pumping signal pass through upper and lower frequency conversion and the mixing generation of exciting signal source submodule at nework analysis module; Wherein, low-frequency range pumping signal directly adds to port by bias inductors, and first radio band pumping signal delivers to 6GHz front-end module, after gain, filtering process, add to port; Reference signal tuning 6GHz ~ 20GHz front-end module VCO that microwave section pumping signal is provided by nework analysis module, occurs, then adds to test port after treatment in 6GHz ~ 20GHz front-end module;
Test signal directional separation unit, it is for realizing being separated of three frequency range test signal transmission waves and reflection wave respectively: because from 5KHz to 20GHz, signal wavelength span is very large, adopts the mode of staging treating in order to reduce directional coupler design difficulty under small size and to obtain better performance index; Wherein, low-frequency range test signal processes at 6GHz front-end module, according to the phase relation between forward and reverse signal, realizes directional separation by the mimic channel be made up of amplifier; Radio band test signal carries out separating treatment at 6GHz front-end module equally, different from low-band signal, and this frequency range test signal have employed bridge type dual directional coupler as discrete device; Microwave frequency band test signal processes at 6GHz ~ 20GHz front-end module, because this segment signal frequency is higher, have employed micro-band plane formula dual directional coupler to be 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 isolates 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, at this, different conversion systems be have employed to the signal of three frequency ranges; Wherein, radio band test signal processes at 6GHz front-end module, adopts sampling frequency mixing method, the 2MHz ~ 60MHz frequency provided 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 processes at 6GHz ~ 20GHz front-end module, adopts harmonic mixing method, the N subharmonic getting 2GHz ~ 4GHz local oscillation signal that local oscillation signal source submodule provides be separated rear signal and carry out mixing, be converted to fixed intermediate frequency; Low-frequency range test signal processes at nework analysis module, after being separated, signal is first through Hilbert filter, 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104320150B (en) * | 2014-10-24 | 2017-05-24 | 上海无线电设备研究所 | Ultra-wideband microwave receiver and signal segment processing method thereof |
| 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 |
| 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 |
| 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 |
| CN109490737B (en) * | 2018-10-26 | 2021-08-31 | 中电科思仪科技股份有限公司 | Universal method and device for frequency expansion multi-parameter automatic test of microwave semiconductor device |
| 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 |
| CN114441889B (en) * | 2022-04-02 | 2022-06-10 | 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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Effective date of registration: 20190306 Address after: 266555 Xiangjiang 98, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 266555 No. 98 Xiangjiang Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: The 41st Institute of CETC |
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