CN107271938B - A kind of frequency mixer vectorial property measurement method - Google Patents
A kind of frequency mixer vectorial property measurement method Download PDFInfo
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- CN107271938B CN107271938B CN201710473375.3A CN201710473375A CN107271938B CN 107271938 B CN107271938 B CN 107271938B CN 201710473375 A CN201710473375 A CN 201710473375A CN 107271938 B CN107271938 B CN 107271938B
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Abstract
The invention proposes a kind of frequency mixer vectorial property measurement methods, an attenuator is increased in medium frequency reception port, the medium frequency output end mouth of the attenuator and tested frequency mixer is directly connected to, effect is to improve the matching of vector network analyzer medium frequency reception port, the medium frequency reception port of vector network analyzer can be regarded as perfect match after with this configuration, it is unidirectional device that frequency mixer is no longer required in error model, improve matching by connecting attenuator in medium frequency reception port simultaneously, it is considered that port is perfect match, the load matched error of receiving port need not be considered further that in error model.Because receiving port of the invention is perfect match, the useful intermediate-freuqncy signal and various wanted parasitic intermediate-freuqncy signals and leakage signal for being transferred to vector network analyzer receiving port can all be received port absorption, it will not be reflected back the intermediate frequency port of frequency mixer again, therefore without measurement error caused by the various parasitic intermediate-freuqncy signals of consideration and leakage signal in error model.
Description
Technical field
The present invention relates to the field of test technology, in particular to a kind of frequency mixer vectorial property measurement method.
Background technique
Frequency mixer is widely used in various civil and military receive-transmit systems, as various advanced digital vectors modulate skill
Art being widely used in such as broadband digital communication system, in order to reduce the bit error rate of system, designer not only needs to close
The amplitude-frequency characteristic of heart frequency mixer, while also requiring to measure its phase-frequency characteristic, that is, to carry out frequency mixer full vector spy
The measurement of property, and while carrying out mixer conversion loss measurement in the past, only carries out the scalar measurement about amplitude characteristic.
Vector network analyzer is a kind of general microwave and millimeter wave measuring instrument, for making extensively in radio-frequency system
The identical so-called same frequency component of such as amplifier, filter, duplexer input and output frequency, may be implemented to its amplitude-frequency and
The precise measurement of phase frequency vectorial property.And for frequency conversion devices such as such as frequency mixers, since its input and output frequency is different, it is passed
The measurement of defeated characteristic phase and group delay property is always a difficult point, this is because vector network analyzer measurement is based on two
The ratio of a homogenous frequency signal measures, the ratio of corresponding two signal amplitudes of amplitude measurements, and phase measurement is two corresponding
The difference of signal phase.And two are always to change there are the phase difference value between frequency difference signal, are not a definite values, therefore such as
Fruit will carry out the amplitude-frequency of frequency mixer transmission characteristic and the full vector measurement of phase-frequency characteristic, it is necessary to take different hardware configuration and survey
Amount method.
Currently, the most popular method for carrying out the measurement of frequency mixer vectorial property using vector network analyzer, referred to as
" calibration of vector frequency mixer " measurement method, as shown in Figure 1, used vector network analyzer is four port network analyzers,
Two independent signal sources and a parametric mixer switch are internally integrated, two sources are respectively used in frequency mixer measurement process
RF excited and local oscillator driving；Alternatively, used vector network analyzer is also possible to two-port vector network analyzer, this
When local oscillation signal provided by the independent signal source in outside one and power splitter.Above-mentioned entire measuring system forms corresponding error
Model is as shown in Figure 2, wherein ED1RFThe directional error at frequency is inputted in frequency mixer radio frequency for source port 1, which depict sources
Size of 1 reference channel of port to Measurement channel leakage errors signal at frequency mixer radio frequency input frequency；ER1RFFor source port 1
Reflection tracking error, which depict the frequency response of 1 receiving channel of source port and reference channel at frequency mixer radio frequency input frequency
Deviation；Es1RFFor the source matching error of source port 1, which depict of the source output terminal mouth 1 at frequency mixer radio frequency input frequency
With situation, the signal a for actually entering frequency mixer prevention at radio-frequency port is also illustrated1RFIn, remove parametric excitation signal a1mRFOutside, due to
The size of additional incoming signal caused by source port mismatch；EL2IFIt is receiving port 2 at mixer intermediate-frequency output frequency
Load matched error is equal to a2IF/b2IF；ETReferred to as transmission tracking error describes 2 Measurement channel of receiving port and source port 1
Frequency response deviation of the reference channel at mixer intermediate-frequency output frequency.Furthermore in order to extract error term in model, it is also necessary to use
Single port error model shown in Fig. 3 and same frequency dual-port error model shown in Fig. 4, the error model shown in Fig. 3 and Fig. 4
In, EDiFor the directional error of source port i, which depict source port i reference channels to the big of Measurement channel leakage errors signal
It is small；ERiFor the reflection tracking error of source port i, which depict the frequency response deviations of source port i receiving channel and reference channel；Esi
For the source matching error of source port i, which depict the matching states of source output terminal mouth i, also illustrate the reality of source output terminal mouth i
Incoming signal aiIn, remove parametric excitation signal aimOutside, the size of the additional incoming signal as caused by source port mismatch；ELij
To load matching error, the load matched state of port i, anti-equal to port when being in excitation state which depict source port j
Penetrate the ratio of signal and incoming signal；ETijIt is received for transmission tracking error which depict when port j is in source output state
The frequency response deviation of port i Measurement channel and source output terminal mouth j reference channel.
Entirely the calibration process of " calibration of vector frequency mixer " measurement method include two-port calibrate for error, source calibration and transmission
Tracking system calibrates for error 3 stages:
Stage 1: it calibrates for error with frequency two-port.The parametric mixer switch bypass of vector network analyzer port 1 at this time
Front panel path, using inner track, 1 source reference signal of port is directly inputted to port 1 with reference to receiving channel.It is used when calibration
Mechanically or electrically calibration component carries out the single port calibration of rf frequency and IF frequency in port 1 respectively, carries out intermediate frequency in port 2
The single port of frequency is calibrated, and the thru calibration of IF frequency is carried out between port 1 and port 2, according to Fig. 3 and arrow shown in Fig. 4
S parameter Measuring error model under Network Analyzer common frequency measurement state is measured, error mould shown in Fig. 2 can be solved by above step
E in typeD1RF、ES1RF、ER1RFAnd EL2IFTotally 4 errors.
Stage 2: the source power and local oscillation power calibration of mismatch error are corrected.The characterisitic parameter and source and local oscillator function of frequency mixer
Rate is directly related, and power meter combination two-port, which calibrates for error, can be achieved source and the local oscillation signal power electricity of removal system mismatch error
Flat calibration.
Stage 3: transmission tracking error item E is extractedT.The parametric mixer switch setting of port 1 is exported to front panel at this time
State, the reference that the intermediate-freuqncy signal that the reference signal that port 1 exports is mixed generation with parametric mixer is input to port 1 receive logical
Road.A calibration frequency mixer calibrated is connected in port 1 and port 2, E can be solvedTError term.
The influence for each error term that above-mentioned calibration process determines is removed by using error correcting technology when measuring,
It can be obtained by the full vector characterisitic parameter of measured piece.
But " calibration of vector frequency mixer " measurement method is primarily present the shortcomings that two aspects:
(1) error correction model inaccuracy.To the modeling of frequency mixer characteristic and the actual characteristic of frequency mixer in error model
It must be ideal unidirectional device that tested frequency mixer is required there are larger gap, in error model, only exist prevention at radio-frequency port in
The forward direction of frequency port is mixed transmission, and there is no the reversed mixing of intermediate frequency port to prevention at radio-frequency port transmission, reversed intermediate frequency port is to penetrating
The conversion loss of frequency port is infinitely great, in radio-frequency head after the signal of mixer intermediate-frequency port input will not be mixed with local oscillation signal
Mouth output.
For using the various frequency mixers with balanced structure of diode fabrication, anti-both direction before radio frequency/intermediate frequency
Circuit structure it is almost symmetrical, therefore the mixed frequency characteristic of both direction be also it is approximate, in many cases it is considered that
It is reciprocity, i.e., radio frequency to intermediate frequency port and the technical indicator of if-to-rf port mixing may be considered identical.
When carrying out the measurement of frequency mixer performance indicator using vector network analyzer, the receiving port of vector network analyzer is not ideal
Matched, after the signal of mixer intermediate-frequency port output is transferred to vector network analyzer receiving port, part signal can be anti-
It is emitted back towards the intermediate frequency port of frequency mixer, because many actual frequency mixers are not ideal unidirectional device, these are reflected back
Signal can be mixed with local oscillation signal after prevention at radio-frequency port export.Because the actual characteristic and measurement model of tested frequency mixer are deposited
In larger gap, very big measurement error will necessarily be introduced.
(2) it is only inputted in frequency and intermediate frequency output frequency in radio frequency and has carried out mismatch error amendment.Mixer intermediate-frequency signal
Frequency may include the optional frequency combination of the fundamental wave and each harmonic of radiofrequency signal and local oscillation signal, if the frequency of radiofrequency signal
Rate is fRF, the frequency of local oscillation signal is fLO, the frequency of intermediate-freuqncy signal may be expressed as: | m × fRF±n×fLO|, m and n can use and be greater than
Any integer value equal to 1, it can be seen that the output signal of frequency mixer is a wide spectrum signal.
In addition, there is also the leakage signals of radio frequency and local oscillator for the intermediate frequency port of practical frequency mixer.Now widely used
In " calibration of vector frequency mixer " measurement method, only in input port to rf frequency, in output port to existing for IF frequency
Mismatch is corrected, and does not carry out relevant error to error caused by other various parasitic intermediate-freuqncy signals and leakage signal
Amendment, this measurement error that can also cause non-difference big.
Summary of the invention
It the shortcomings that being previously mentioned for now widely used " calibration of vector frequency mixer " measurement method and is accurately mixed
The measurement of device vectorial property there is an urgent need to, the present invention to propose a kind of completely new frequency mixer vectorial property measurement method, establish survey
Error model is measured, the error correcting method for extracting that the calibration method of error term and removal error term influence in model is given, gram
Two disadvantages above-mentioned are taken, realize accurate frequency mixer full vector feature measurement.
The technical scheme of the present invention is realized as follows:
A kind of frequency mixer vectorial property measurement method increases an attenuator, the attenuator and quilt in medium frequency reception port
The medium frequency output end mouth for surveying frequency mixer is directly connected to, including following measuring process:
Measuring process 1: the source reference signal of port 1 is directly inputted to the reference channel of port 1, the prevention at radio-frequency port of frequency mixer
Match S11RFIt is determined by error correction formula (6):
In equation (6), ED1RFThe directional error at frequency, E are inputted in frequency mixer radio frequency for source port 1R1RFFor source port
1 reflection tracking error, Es1RFFor the source matching error of source port 1, S11RFMDirectly to measure the measured piece without error correction
The prevention at radio-frequency port of frequency mixer matches, and is defined as follows:
In equation (7), a1mRFFor parametric excitation signal measurements, b1mRFTo be tested frequency mixer prevention at radio-frequency port output signal
Measured value；
Measuring process 2: the source reference signal that port 1 exports is mixed the intermediate-freuqncy signal generated with parametric mixer and is input to end
The reference channel of mouth 1, the vector transmission conversion loss C for the frequency mixer that removal error term influences21It is true by error correction formula (8)
It is fixed:
In equation (8), Es1RFFor the source matching error of source port 1, ETFor transmission tracking error, C21MFor directly measure without
The forward direction vector converter of the measured piece frequency mixer of error correction is lost, and is defined as follows:
In equation (9), a1mRFFor parametric excitation signal measurements, b2mIFTo be tested mixer intermediate-frequency port output signal
Measured value；
By above step complete frequency mixer before to matching S11RFC is lost with vector converter21Measurement.
Optionally, it before measuring step, calibrates for error first, determines each error term in error model, school
Quasi- process the following steps are included:
Calibration steps 1 carries out the single port in frequency mixer radio frequency input respective frequencies in the port of vector network analyzer 1
Calibration, the parametric mixer by-pass switch of port 1 are set as inner track state, and the source reference signal of port 1 is directly inputted to
The reference receiving channel of internal port 1；Measured with frequency S parameter, connects 3 different reflections in port 1 respectively when calibration
Standard, if given value of 3 reflectance standards on rf frequency is respectively Γ1、Γ2And Γ3, corresponding measured value is respectively M1、
M2And M3, determine following 3 errors in error model:
Calibration steps 2, carries out transmission calibration, and the parametric mixer switch setting of vector network analyzer is exported to front panel
State, the reference that the intermediate-freuqncy signal that the reference signal that port 1 exports is mixed generation with parametric mixer is input to port 1 receive logical
Frequency mixer is calibrated known to 2 connection performance of the port of vector network analyzer 1 and port, the error term in error model in road
ETIt is determined by following equation:
In equation (4), MRFAnd TFFor the known features scaled values for calibrating frequency mixer, TFMInstitute is directly measured for calibration frequency mixer
The forward direction conversion loss obtained, is defined as follows:
In equation (5), a1mRFFor parametric excitation signal measurements, b2mIFFor calibration mixer intermediate-frequency port output signal
Measured value；
It optionally, further include the calibration of power of carry out source and local oscillator after calibrating for error described in completion.
Optionally, the increased attenuator reflection coefficient of port loss is better than 35dB, pad value 20dB.
The beneficial effects of the present invention are:
(1) adaptability measured is good: reducing the requirement to tested frequency mixer, suitable for the measurement of various frequency mixers, no
Requiring tested frequency mixer again must be unidirectional device.
(2) measurement accuracy is high: the various spurious frequency com-ponents and leakage signal for eliminating frequency mixer mixing generation are measuring
Shadow of the various measurement errors to measurement accuracy caused by roundtrip between port and between measurement port and tested mixer ports
It rings, the consistency of the measurement accuracy and measurement result that greatly improve.
(3) calibration process is simple: now widely used " calibration of vector frequency mixer " measurement method is at least needed in calibration
3 single port calibration measurements are carried out, once transmit school with the measurement of frequency thru calibration and the frequency conversion of primary connection calibration frequency mixer
Locating tab assembly；Measurement method proposed by the present invention only needs to carry out when being calibrated a single port calibration measurement and primary connection
The frequency conversion transmission measurement for calibrating frequency mixer, enormously simplifies calibration process.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the system block diagram of existing vector frequency mixer calibration measurement method；
Fig. 2 is existing vector frequency mixer calibration measurement method error model figure；
Fig. 3 is existing same frequency single port S parameter Measuring error model figure；
Fig. 4 is existing same frequency dual-port S parameter Measuring error model figure；
Fig. 5 is the system block diagram of frequency mixer vectorial property measurement method of the invention；
Fig. 6 is the Measuring error model figure of measurement method of the present invention；
Fig. 7 is the calibration frequency mixer and characteristic model figure of measurement method of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The composition of measurement connection configuration method and measuring system proposed by the invention is as shown in figure 5, with shown in FIG. 1
The comparison of " calibration of vector frequency mixer " measurement method can be seen that measurement connection method proposed by the invention in medium frequency reception port
An attenuator is increased, which must be directly connected to the medium frequency output end mouth of tested frequency mixer, and main function is to change
The matching of kind vector network analyzer medium frequency reception port, it is desirable that the loss of attenuator reflection coefficient of port is better than 35dB, pad value 20dB
Left and right, with this configuration after can regard the medium frequency reception port of vector network analyzer as perfect match.
Measuring error model proposed by the invention is as shown in fig. 6, being no longer required for frequency mixer in error model is isolator
Part, while improving matching by connecting attenuator in medium frequency reception port, it is believed that port is perfect match, in error mould
The load matched error E of receiving port need not be considered further that in typeL2IF, it is believed that it is equal to 0.Because receiving port of the invention is reason
Think matched, is transferred to the useful intermediate-freuqncy signal of vector network analyzer receiving port and various wanted parasitic intermediate-freuqncy signals and lets out
Dew signal can all be received port absorption, will not be reflected back the intermediate frequency port of frequency mixer again, therefore without examining in error model
Consider measurement error caused by various parasitic intermediate-freuqncy signals and leakage signal.
Before measurements, it first has to calibrate for error, determines each error term in error model shown in Fig. 6, determine
The calibration process of error term includes two steps:
Calibration steps 1 carries out the single port in frequency mixer radio frequency input respective frequencies in the port of vector network analyzer 1
Calibration.The parametric mixer by-pass switch of port 1 is set as inner track state at this time, and the source reference signal of port 1 is directly defeated
Enter the reference receiving channel to internal port 1.Same frequency S parameter measurement is carried out at this time, according to Fig.6, error model, at this time only
It need to consider error relevant to port 1, when calibration connects 3 different reflectance standards in port 1 respectively, if 3 reflectance standards
Given value on rf frequency is respectively Γ1、Γ2And Γ3, corresponding measured value is respectively M1、M2And M3, can determine Fig. 6
Following 3 errors in error model.
Calibration steps 2 carries out transmission calibration, and front panel is arrived in the parametric mixer switch setting of vector network analyzer at this time
Output state, the reference that the intermediate-freuqncy signal that the reference signal that port 1 exports is mixed generation with parametric mixer is input to port 1 connect
Channel is received, calibrates frequency mixer known to 2 connection performance of the port of vector network analyzer 1 and port, in Fig. 6 error model
Error term ETIt is determined by following equation:
In equation (4), TFMResulting forward direction conversion loss is directly measured for calibration frequency mixer, according to Fig.6, error mould
The signal of type, is defined as follows:
MRFAnd TFFor the known features scaled values for calibrating frequency mixer, specific value is mentioned by the producer for providing calibration frequency mixer
For.
After completion calibrates for error, the calibration of power of source and local oscillator can be carried out, with the power level in the source of improving and local oscillation signal
Precision.
So far, present invention determine that whole error terms in error model shown in Fig. 6.When carrying out frequency mixer measurement,
Tested frequency mixer is connected between port 1 and port 2, is missed by following measuring process and as shown in equation (6) and equation (8)
Poor correction formula, so that it may which the influence for removing each error term obtains the tested accurate vectorial property measured value of frequency mixer:
Measuring process 1: internal path state, i.e. the source reference signal of port 1 are arrived in the parametric mixer switch setting of port 1
It is directly inputted to the reference channel of port 1, the prevention at radio-frequency port for the frequency mixer that removal error term influences matches S11RFIt is repaired by error
Positive formula (6) determines:
In equation (6), S11RFMIt is matched directly to measure the prevention at radio-frequency port of the measured piece frequency mixer without error correction, according to
Signal definition shown in fig. 6 is as follows:
Measuring process 2: front panel output state, the source reference that port 1 exports are arrived in the parametric mixer switch setting of port 1
Signal is mixed the reference channel that the intermediate-freuqncy signal generated is input to port 1, the mixing that removal error term influences with parametric mixer
The vector transmission conversion loss C of device21It is determined by error correction formula (8):
In equation (8), C21MIt is lost directly to measure the forward direction vector converter of the measured piece frequency mixer without error correction,
Signal definition according to figure 6 is as follows:
By above step complete frequency mixer before to matching S11RFC is lost with vector converter21Measurement.
Advantages of the present invention mainly includes following aspect:
(1) adaptability measured is good.The requirement to tested frequency mixer is reduced, suitable for the measurement of various frequency mixers, no
Requiring tested frequency mixer again must be unidirectional device.
(2) measurement accuracy is high.The various spurious frequency com-ponents and leakage signal for eliminating frequency mixer mixing generation are measuring
Shadow of the various measurement errors to measurement accuracy caused by roundtrip between port and between measurement port and tested mixer ports
It rings, the consistency of the measurement accuracy and measurement result that greatly improve.
(3) calibration process is simple.Now widely used " calibration of vector frequency mixer " measurement method is at least needed in calibration
3 single port calibration measurements are carried out, once transmit school with the measurement of frequency thru calibration and the frequency conversion of primary connection calibration frequency mixer
Locating tab assembly.Measurement method proposed by the present invention only needs to carry out when being calibrated a single port calibration measurement and primary connection
The frequency conversion transmission measurement for calibrating frequency mixer, enormously simplifies calibration process.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of frequency mixer vectorial property measurement method, which is characterized in that increase an attenuator in medium frequency reception port, this declines
The medium frequency output end mouth for subtracting device and tested frequency mixer is directly connected to, including following measuring process:
Measuring process 1: the source reference signal of port 1 is directly inputted to the reference channel of port 1, the prevention at radio-frequency port matching of frequency mixer
S11RFIt is determined by error correction formula (6):
In equation (6), ED1RFThe directional error at frequency, E are inputted in frequency mixer radio frequency for source port 1R1RFFor source port 1
Reflection tracking error, Es1RFFor the source matching error of source port 1, S11RFMDirectly to measure the measured piece mixing without error correction
The prevention at radio-frequency port of device matches, and is defined as follows:
In equation (7), a1mRFFor parametric excitation signal, b1mRFFor the measured value for being tested frequency mixer prevention at radio-frequency port output signal；
Measuring process 2: the source reference signal that port 1 exports is mixed the intermediate-freuqncy signal generated with parametric mixer and is input to port 1
Reference channel, removal error term influence frequency mixer vector transmission conversion loss C21It is determined by error correction formula (8):
In equation (8), Es1RFFor the source matching error of source port 1, ETFor transmission tracking error, C21MDirectly to measure without error
The forward direction vector converter of modified measured piece frequency mixer is lost, and is defined as follows:
In equation (9), a1mRFFor parametric excitation signal, b2mIFFor the measured value for being tested mixer intermediate-frequency port output signal；
Frequency mixer prevention at radio-frequency port, which is completed, by above step matches S11RFWith vector transmission conversion loss C21Measurement.
2. a kind of frequency mixer vectorial property measurement method as described in claim 1, which is characterized in that
Before measuring step, calibrate for error first, determine each error term in error model, calibration process include with
Lower step:
Calibration steps 1 carries out the single port school in frequency mixer radio frequency input respective frequencies in the port of vector network analyzer 1
Standard, the parametric mixer by-pass switch of port 1 are set as inner track state, and the source reference signal of port 1 is directly inputted to interior
The reference receiving channel of portion port 1；Measured with frequency S parameter, connects 3 different reflection marks in port 1 respectively when calibration
Standard, if given value of 3 reflectance standards on rf frequency is respectively Γ1、Γ2And Γ3, corresponding measured value is respectively M1、M2
And M3, determine following 3 errors in error model:
Calibration steps 2, carries out transmission calibration, and the parametric mixer switch setting of vector network analyzer exports shape to front panel
State, the reference that the intermediate-freuqncy signal that the reference signal that port 1 exports is mixed generation with parametric mixer is input to port 1 receive logical
Frequency mixer is calibrated known to 2 connection performance of the port of vector network analyzer 1 and port, the error term in error model in road
ETIt is determined by following equation:
In equation (4), MRFAnd TFFor the known features scaled values for calibrating frequency mixer, TFMIt is directly measured for calibration frequency mixer resulting
Forward direction conversion loss, is defined as follows:
In equation (5), a1mRFFor parametric excitation signal, b2mIFFor the measured value for calibrating mixer intermediate-frequency port output signal.
3. a kind of frequency mixer vectorial property measurement method as claimed in claim 2, which is characterized in that calibrate for error described in completion
It afterwards, further include the calibration of power of carry out source and local oscillator.
4. a kind of frequency mixer vectorial property measurement method as described in claim 1, which is characterized in that
Increased attenuator reflection coefficient of port loss is better than 35dB, pad value 20dB.
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| EP0929149A1 (en) * | 1998-01-12 | 1999-07-14 | Alps Electric Co., Ltd. | Receiver for data transmission |
| CN103399286A (en) * | 2013-07-16 | 2013-11-20 | 中国电子科技集团公司第四十一研究所 | Measurement calibration method for multi-characteristic impedance network |
| CN103760509A (en) * | 2014-01-13 | 2014-04-30 | 中国电子科技集团公司第四十一研究所 | Multi-port vector network analyzer calibrating method involved with switch compensating errors |
| CN104459395A (en) * | 2014-12-04 | 2015-03-25 | 中国电子科技集团公司第四十一研究所 | Calibration frequency mixer scaling method based on time-frequency double domains |
| CN105044637A (en) * | 2015-05-08 | 2015-11-11 | 中国电子科技集团公司第四十一研究所 | Calibration apparatus and calibration method for calibrating vector network analyser |
| CN106067844A (en) * | 2016-05-24 | 2016-11-02 | 中国电子科技集团公司第四十研究所 | The compensation device of a kind of noise source excess noise ratio flatness and method |
| CN106324541A (en) * | 2016-08-17 | 2017-01-11 | 中国电子科技集团公司第四十研究所 | Non-inserted device measurement calibration method |
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