A method for calibrating a vector mixer measurement of a device based on reciprocity

Abstract

The application is suitable for the field of instrument calibration technology, and provides a vector mixer measurement calibration method for calibrating devices based on reciprocity characteristics, which comprises the following steps: according to a forward error model and a backward error model of a calibration model and S parameters of a calibration device, eight error items required for correction are calculated; according to the obtained error items and the calibration device, S parameters of a mixer and a filter combination are calculated by using the reciprocity characteristics; according to the characteristics of the mixer and the filter combination, frequency conversion error items are calculated after two-port connection measurement; and finally, according to nine error items in a correction model, measurement values of a to-be-measured mixer, and a correction expression, actual S parameters of the mixer are obtained. The application proposes to measure frequency conversion related error items by using a mixer and a filter combination which satisfy the reciprocity characteristics as a whole, so that the calibration precision of a vector network analyzer for measuring the mixer can be improved.

Description

Technical Field

[0001] This application belongs to the field of instrument calibration technology, and in particular relates to a vector mixer measurement and calibration method based on a reciprocity calibration device. Background Technology

[0002] In the field of microwave measurement, accurately measuring the scattering parameters of devices in an RF system is a crucial step in verifying design performance. Vector network analyzers, as a commonly used microwave testing tool, can efficiently acquire the S-parameters of networks and are therefore widely used in the RF and microwave fields. In practical applications, reliable calibration of the vector network analyzer is necessary to ensure the accuracy of measurement data. Conventional vector network analyzer calibration methods typically rely on the ideal calibration values ​​of standard calibration components, such as open circuit, short circuit, and load conditions, to establish an error model. Its accuracy is limited by the performance stability of the standard components; a decrease in accuracy directly affects the analyzer's measurement consistency and repeatability.

[0003] For measurements involving mixers, traditional RF network calibration methods are not directly applicable, requiring specialized vector mixer calibration techniques. Currently, common mixer delay or phase nonlinearity calibration test methods mainly include: down / up transformation methods, vector mixer calibration, and phase coherent receiver testing methods. However, vector mixer calibration suffers from reduced measurement accuracy by vector network analyzers due to calibration device losses and the use of non-reciprocal mixer filter combinations for characterization. Summary of the Invention

[0004] This application provides a vector mixer measurement and calibration method based on a reciprocal calibration device, which can solve the problem that current vector mixer calibration suffers from reduced measurement mixer calibration accuracy due to calibration device losses and the use of non-reciprocal mixer filter combinations for characterization.

[0005] In a first aspect, embodiments of this application provide a vector mixer measurement and calibration method based on reciprocity characteristic calibration devices, comprising the following steps: S1, using three single-port devices whose scattering S-parameter characteristics have been calibrated, labeled as device O, device S, and device L respectively, as the devices under test for calibration; S2, measuring device O, device S, and device L at two ports of a vector network analyzer respectively, obtaining six single-port measurement values; S3, based on the reflection functions of the forward error model and the backward error model, the six single-port measurement values, and the calibration S-parameters of the three devices in step S1, solving for the six single-port error terms E in the forward error model and the backward error model. DF E SF E RF E DR E SR ERR S4. Connect the two ports of the vector network analyzer to obtain four measurements. Combine the transfer functions of the forward and backward error models to solve for the four error terms E. LF E TF E LR E TR S5. Connect port 1 of the vector network analyzer to a combined device mixer and filter whose combined characteristics satisfy reciprocity. Measure device O, device S, and device L using port 1 of the vector network analyzer to obtain three measured values. Combine these with the three single-port error terms obtained in step S3 and the reflection function of the calibration characterization model to solve for the overall S-parameters of the combined device mixer and filter. S6. Connect the two ports of the vector network analyzer to the combined device mixer and filter for measurement to obtain the corresponding measured values. Combine these with the overall S-parameters obtained in step S5 and the two error terms E from S3 and S4. SF and E LF Solve for an error term E related to the frequency converter. TFC S7. Use a vector network analyzer to measure the mixer under test and obtain the corresponding three measurement values. Based on the six error terms in step S3 and the error term E in step S4, LF An error term E related to frequency conversion in step S6 TFC By combining the vector mixer calibration correction function, the actual S-parameters of the mixer under test are obtained to complete the calibration.

[0006] In one possible implementation of the first aspect, step S2 described above is as follows:

[0007] S2.1 Connect devices 0, S, and L sequentially to port 1 of the vector network analyzer, and record the measured values ​​as follows: Γ O1 ,Γ S1 ,Γ L1 ;

[0008] S2.2 Connect devices 0, S, and L sequentially to ports 2 of the vector network analyzer, and record the measured values ​​as follows: Γ O2 ,Γ S2 ,Γ L2 ;

[0009] S2.3, Γ O1 ,Γ S1 ,Γ L1 ,Γ O2 ,Γ S2 ,Γ L2 The measurements were determined to be six single-port measurements.

[0010] Optionally, in another possible implementation of the first aspect, step S3 is specifically as follows:

[0011] Define the reflection functions for the forward error model and the backward error model as follows:

[0012]

[0013] Among them, a 1M b 1M These are the incident and reflected waves at port 1 of the vector network analyzer, a 2M b 2M It is the incident and reflected wave at port 1 of the vector network analyzer, E DF E SF E RF For port 1 hardware error term, E DR E SR E RR For the 2-port hardware error term, S 11 S 21 S 12 S 22 These are the S-parameters, E of the device under test. LF E TF It is the transmission error term from port 1 to port 2, E LR E TR It is the transmission error term from port 2 to port 1, Γ O ,Γ S ,Γ L These are the S-parameters of device O, device S, and device L, respectively.

[0014] S M11 and S M22 The values ​​represent the measurements at ports 1 and 2 of the vector network analyzer. The measurements Γ from the three devices at port 1 are... O1 ,Γ S1 ,Γ L1 Substituting these equations into the reflection function of the forward error model, we obtain the following system of equations for the reflection function:

[0015]

[0016]

[0017] Solving the reflection function equations yields the three error terms E of the single-port forward error model in step S3. DF E SF E RF for:

[0018]

[0019] in:

[0020]

[0021] Translate the Γ in formula (3) to formula (8) O1 ,Γ S1 ,Γ L1 respectively by Γ O2 ,Γ S2 ,Γ L2 The substitution yields the three error terms E of the single-port backward error model in step S3. DR E SR E RR E DF E SF E RF E DR E SR E RR The six error terms in the forward and backward error models were identified as single-port error terms.

[0022] Optionally, in another possible implementation of the first aspect, step S4 above is specifically as follows:

[0023] The transfer functions for the forward error model and the backward error model are defined as follows:

[0024]

[0025] Based on the four S-parameter measurements obtained from the two-port connection of the vector network analyzer, S... 11M S 22M S M12 S M21 The four error terms are solved as follows:

[0026]

[0027] E TF = (1-E SF E LF )S 21M (16)

[0028]

[0029] E TR = (1-E SR E LR )S 12M (18)

[0030] Optionally, in another possible implementation of the first aspect, step S5 is specifically as follows:

[0031] Define the reflection function of the calibration characterization model as:

[0032]

[0033] Using a vector network analyzer connected to one port of the mixer and filter combination, the three devices in S1 were measured to obtain the measured value Γ. OM ,Γ SM ,Γ LM Combine the three measurements and the S-parameters Γ of the three devices O ,Γ S ,Γ L Substituting the reflection function into the calibration characterization model yields a system of equations; solving the system of equations yields the overall S-parameters from step S5.

[0034]

[0035] in:

[0036]

[0037] Optionally, in another possible implementation of the first aspect, step S6 is specifically as follows:

[0038]

[0039] Where, Δ S =SC 11 SC 22 -SC 21 SC 12 SC 21M The measured values ​​are obtained by connecting a mixer and a filter to two ports of a vector network analyzer.

[0040] Optionally, in another possible implementation of the first aspect, step S7 is specifically as follows:

[0041] The mixer under test (DUT) was measured using a vector network analyzer, and three measured values ​​of the DUT were obtained as SC. 11M SC 22M SC M21 ;

[0042] Based on the known error term E DF E SF E RF E DR E SR E RR E LF E TFC The three measured values ​​SC 11M SC 22M SC M21 The actual S-parameters of the mixer under test are obtained by making corrections.

[0043] Beneficial Effects: The technical solution of this application first calculates the eight error terms required for correction based on the forward and backward error models of the calibration model, the S-parameters of the calibration device, and the measured values. Then, based on the obtained error terms and the calibration device, the S-parameters of the mixer and filter combination are calculated using the reciprocity property. Next, based on the characteristics of the mixer and filter combination, the frequency conversion error terms are calculated after two-port connection measurement. Finally, based on the nine error terms in the correction model, the measured values ​​of the mixer under test, and the correction expression, the actual S-parameters of the mixer are obtained. This application proposes using a mixer and filter combination that satisfies overall reciprocity to measure frequency conversion-related error terms, thereby improving the calibration accuracy of the vector network analyzer for measuring the mixer. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic flowchart of a vector mixer measurement and calibration method based on a reciprocity calibration device provided in an embodiment of this application;

[0046] Figure 2 This is a signal flow graph of the forward error model and the backward error model provided in an embodiment of this application. Detailed Implementation

[0047] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0048] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0049] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0050] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0051] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0053] The following is a detailed description of a vector mixer measurement and calibration method based on a reciprocity calibration device provided in this application, with reference to the accompanying drawings.

[0054] Figure 1 The illustration shows a schematic flowchart of a vector mixer measurement and calibration method based on a reciprocity calibration device provided in an embodiment of this application.

[0055] like Figure 1 As shown, the vector mixer measurement and calibration method based on the reciprocity characteristic calibration device includes the following steps:

[0056] S1. Use three single-port devices whose scattering S-parameter characteristics have been calibrated, labeled as device O, device S, and device L, as the devices under test for calibration.

[0057] S2. Measure devices O, S, and L at the two ports of the vector network analyzer to obtain six single-port measurement values;

[0058] Furthermore, in this embodiment of the application, step S2 includes:

[0059] S2.1 Connect devices 0, S, and L sequentially to port 1 of the vector network analyzer, and record the measured values ​​as follows: Γ O1 ,Γ S1 ,Γ L1 ;

[0060] S2.2 Connect devices 0, S, and L sequentially to ports 2 of the vector network analyzer, and record the measured values ​​as follows: Γ O2 ,Γ S2 ,Γ L2 ;

[0061] S2.3, Γ O1 ,Γ S1 ,Γ L1 ,Γ O2 ,Γ S2 ,Γ L2 The measurements were determined to be six single-port measurements.

[0062] S3. Based on the reflection functions of the forward and backward error models, the six single-port measurements, and the calibration S-parameters of the three devices in step S1, solve for the six single-port error terms E in the forward and backward error models. DF E SF E RF E DR E SR E RR ;

[0063] Specifically, such as Figure 2 As shown, there are a total of 10 error terms in the forward and backward error models. Among them, E DF E SF E RF For port 1 hardware error terms, the three error terms are only related to the internal hardware structure of port 1 of the vector network analyzer. Similarly, E... DR E SR E RR This is the hardware error term for port 2. When ports 1 and 2 of the vector network analyzer are connected, E... LF E TF It is the transmission error term from port 1 to port 2, E LR E TR It is the transmission error term from port 2 to port 1.

[0064] Furthermore, in this embodiment of the application, step S3 includes:

[0065] Define the reflection functions for the forward error model and the backward error model as follows:

[0066]

[0067] Among them, a 1M b 1M These are the incident and reflected waves at port 1 of the vector network analyzer, a 2M b 2M It is the incident and reflected wave at port 1 of the vector network analyzer, E DF E SF E RF For port 1 hardware error term, E DR E SR E RR For the 2-port hardware error term, S 11 S 21 S 12 S 22 These are the S-parameters, E of the device under test. LF E TF It is the transmission error term from port 1 to port 2, E LR E TR It is the transmission error term from port 2 to port 1, Γ O ,Γ S ,Γ L These are the S-parameters of device O, device S, and device L, respectively.

[0068] S M11 and S M22 The values ​​represent the measurements at ports 1 and 2 of the vector network analyzer. The measurements Γ from the three devices at port 1 are... O1 ,Γ S1 ,Γ L1 Substituting these equations into the reflection function of the forward error model, we obtain the following system of equations for the reflection function:

[0069]

[0070] Solving the reflection function equations yields the three error terms E of the single-port forward error model in step S3. DF E SF E RF for:

[0071]

[0072]

[0073] in:

[0074]

[0075] Translate the Γ in formula (3) to formula (8) O1 ,Γ S1 ,Γ L1 respectively by Γ O2 ,Γ S2 ,ΓL2 The substitution yields the three error terms E of the single-port backward error model in step S3. DR E SR E RR E DF E SF E RF E DR E SR E RR The six error terms in the forward and backward error models were identified as single-port error terms.

[0076] It should be noted that the solution of the reflection function of the above forward error model and backward error model is based on Mason's formula.

[0077] S4. Connect the two ports of the vector network analyzer to obtain four measurements. Combining the transfer functions of the forward and backward error models, solve for the four error terms E. LF E TF E LR E TR ;

[0078] Furthermore, in this embodiment of the application, step S4 includes:

[0079] The transfer functions for the forward error model and the backward error model are defined as follows:

[0080]

[0081] Based on the four S-parameter measurements obtained from the two-port connection of the vector network analyzer, S... 11M S 22M S M12 S M21 The four error terms are solved as follows:

[0082]

[0083] E TF = (1-E SF E LF )S 21M (16)

[0084]

[0085] E TR = (1-E SR E LR )S 12M (18)

[0086] It should be noted that the transfer functions of the above forward and backward error models are solved using Mason's formula.

[0087] S5. Connect the vector network analyzer port 1 to the combined device mixer and filter that satisfy the reciprocity of the combined characteristics, and use the vector network analyzer port 1 to measure device O, device S, and device L to obtain three measurement values. Combine the three single-port error terms obtained in step S3 and the reflection function of the calibration characterization model to solve the overall S-parameters of the combined device mixer and filter.

[0088] Furthermore, in this embodiment of the application, step S5 includes:

[0089] Define the reflection function of the calibration characterization model as:

[0090]

[0091] Using a vector network analyzer connected to one port of the mixer and filter combination, the three devices in S1 were measured to obtain the measured value Γ. OM ,Γ SM ,Γ LM Combine the three measurements and the S-parameters Γ of the three devices O ,Γ S ,Γ L Substituting the reflection function into the calibration characterization model yields a system of equations; solving the system of equations yields the overall S-parameters from step S5.

[0092]

[0093] in:

[0094]

[0095] S6. Connect the two ports of the vector network analyzer to the combined device mixer and filter for measurement, obtain the corresponding measurement values, and combine them with the overall S-parameters in step S5 and the two error terms E in S3 and S4. SF and E LF Solve for an error term E related to the frequency converter. TFC ;

[0096] Furthermore, in this embodiment, step S6 is specifically as follows:

[0097]

[0098] Where, Δ S =SC 11 SC 22 -SC 21 SC 12 SC 21M The measured values ​​are obtained by connecting a mixer and a filter to two ports of a vector network analyzer.

[0099] S7. Use a vector network analyzer to measure the mixer under test and obtain the corresponding three measurement values. Based on the six error terms in step S3 and the error term E in step S4... LF An error term E related to frequency conversion in step S6 TFC By combining the vector mixer calibration correction function, the actual S-parameters of the mixer under test are obtained to complete the calibration.

[0100] Furthermore, in this embodiment of the application, step S7 includes:

[0101] The mixer under test (DUT) was measured using a vector network analyzer, and three measured values ​​of the DUT were obtained as SC. 11M SC 22M SC M21 ;

[0102] Based on the known error term E DF E SF E RF E DR E SR E RR E LF E TFC The three measured values ​​SC 11M SC 22M SC M21 The actual S-parameters of the mixer under test are obtained by making corrections.

[0103] In one embodiment, the vector network analyzer actually measures a mixer under test to obtain the SC. 11M SC 22M SC M21 Three measurements. From single-port E DF E SF E RF E DR E SR E RR The six error terms, transmission error E LF An error term, E TFC The frequency conversion related error term can be obtained firstly from the forward error model and backward error model functions, S 11M and S 22M The measured values ​​SC are respectively 11M SC 22M The single-port error term E DF E SF E RF E DR E SR E RR And S in the expression 21 and S 12The result is 0. The two equations can be used to solve for the unknown quantity S of the mixer under test. 11 and S 22 Secondly, based on the solution function for the frequency converter-related error term, it can be known that SC 21M For the measured value SC M21 SC 11 and SC 22 S of the mixer under test 11 and S 22 The transmission error term E LF and SC 12 If the value is 0, the unknown quantity SC of the mixer under test in the expression can be obtained. 21 The actual S-parameters of the mixer under test can be obtained by correcting the above solution process.

[0104] This application provides a vector mixer measurement and calibration method based on reciprocity characteristic calibration devices. First, three single-port devices with calibrated scattering S-parameter characteristics are used as the devices under test for calibration, labeled as device O, device S, and device L. Then, measurements are performed on devices O, S, and L at two ports of a vector network analyzer, obtaining six single-port measurement values. Next, based on the reflection functions of the forward and backward error models, the six single-port measurement values, and the calibration S-parameters of the three devices in step S1, the six single-port error terms E in the forward and backward error models are solved. DF E SF E RF E DR E SR E RR Then, the two ports of the vector network analyzer are connected to each other to obtain four measurement values. Combining the transfer functions of the forward error model and the backward error model, the four error terms E are solved. LF E TF E LR E TR Connect port 1 of the vector network analyzer to a combined device mixer and filter whose combined characteristics satisfy reciprocity. Measure device O, device S, and device L using port 1 of the vector network analyzer to obtain three measurement values. Combine these with the three single-port error terms obtained in step S3 and the reflection function of the calibration characterization model to solve for the overall S-parameters of the combined device mixer and filter. Then, connect the two ports of the vector network analyzer to the combined device mixer and filter for measurement to obtain the corresponding measurement values. Combine these with the overall S-parameters obtained in step S5 and the two error terms E from S3 and S4. SF and E LF Solve for an error term E related to the frequency converter. TFCFinally, the three corresponding measurement values ​​of the mixer under test are obtained by using a vector network analyzer, and the results are based on the six error terms in step S3 and the error term E in step S4. LF An error term E related to frequency conversion in step S6 TFC By combining the vector mixer calibration correction function, the actual S-parameters of the mixer under test are obtained to complete the calibration. This application proposes using a combination of mixers and filters that satisfy overall reciprocity to measure frequency conversion-related error terms, thereby improving the calibration accuracy of the vector network analyzer for measuring the mixer.

[0105] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0106] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A vector mixer measurement and calibration method based on a reciprocity characteristic calibration device, characterized in that, Includes the following steps: S1. Use three single-port devices whose scattering S-parameter characteristics have been calibrated, labeled as device O, device S, and device L, as the devices under test for calibration. S2. Measure devices O, S, and L at the two ports of the vector network analyzer to obtain six single-port measurement values; S3. Based on the reflection functions of the forward and backward error models, the six single-port measurements, and the calibration S-parameters of the three devices in step S1, solve for the six single-port error terms E in the forward and backward error models. DF E SF E RF E DR E SR E RR ; S4. Connect the two ports of the vector network analyzer to obtain four measurements. Combining the transfer functions of the forward and backward error models, solve for the four error terms E. LF E TF E LR E TR ; S5. Connect the vector network analyzer port 1 to the combined device mixer and filter that satisfy the reciprocity of the combined characteristics, and use the vector network analyzer port 1 to measure device O, device S, and device L to obtain three measurement values. Combine the three single-port error terms obtained in step S3 and the reflection function of the calibration characterization model to solve the overall S-parameters of the combined device mixer and filter. S6. Connect the two ports of the vector network analyzer to the combined device mixer and filter for measurement, obtain the corresponding measurement values, and combine them with the overall S-parameters in step S5 and the two error terms E in S3 and S4. SF and E LF Solve for an error term E related to the frequency converter. TFC ; S7. Use a vector network analyzer to measure the mixer under test and obtain the corresponding three measurement values. Based on the six error terms in step S3 and the error term E in step S4... LF An error term E related to frequency conversion in step S6 TFC By combining the vector mixer calibration correction function, the actual S-parameters of the mixer under test are obtained to complete the calibration; Step S3 is as follows: Define the reflection functions for the forward error model and the backward error model as follows: Among them, a 1M b 1M These are the incident and reflected waves at port 1 of the vector network analyzer, a 2M b 2M It is the incident and reflected wave at port 1 of the vector network analyzer, E DF E SF E RF For port 1 hardware error term, E DR E SR E RR For the 2-port hardware error term, S 11 S 21 S 12 S 22 These are the S-parameters, E of the device under test. LF E TF It is the transmission error term from port 1 to port 2, E LR E TR It is the transmission error term from port 2 to port 1, Γ O ,Γ S ,Γ L These are the S-parameters of device O, device S, and device L, respectively. S M11 and S M22 The values ​​represent the measurements at ports 1 and 2 of the vector network analyzer. The measurements Γ from the three devices at port 1 are... O1 ,Γ S1 ,Γ L1 Substituting these equations into the reflection function of the forward error model, we obtain the following system of equations for the reflection function: Solving the reflection function equations yields the three error terms E of the single-port forward error model in step S3. DF E SF E RF for: in: Translate the Γ in formula (3) to formula (8) O1 ,Γ S1 ,Γ L1 respectively by Γ O2 ,Γ S2 ,Γ L2 The substitution yields the three error terms E of the single-port backward error model in step S3. DR E SR E RR E DF E SF E RF E DR E SR E RR The six error terms in the forward and backward error models are identified as single-port error terms. Step S5 is as follows: Define the reflection function of the calibration characterization model as: Using a vector network analyzer connected to one port of the mixer and filter combination, the three devices in S1 were measured to obtain the measured value Γ. OM ,Γ SM ,Γ LM Combine the three measurements and the S-parameters Γ of the three devices O ,Γ S ,Γ L Substitute the reflection function into the calibration characterization model to obtain a system of equations, and solve the system of equations to obtain the overall S-parameters mentioned in step S5: in: Step S6 is as follows: Where, Δ S =SC 11 SC 22 -SC 21 SC 12 SC 21M The measured values ​​are obtained by connecting a mixer and a filter to two ports of a vector network analyzer.

2. The vector mixer measurement and calibration method based on a reciprocity characteristic calibration device according to claim 1, characterized in that, The specific process of step S2 is as follows: S2.1 Connect devices 0, S, and L sequentially to port 1 of the vector network analyzer, and record the measured values ​​as follows: Γ O1 ,Γ S1 ,Γ L1 ; S2.2 Connect devices 0, S, and L sequentially to ports 2 of the vector network analyzer, and record the measured values ​​as follows: Γ O2 ,Γ S2 ,Γ L2 ; S2.3, Γ O1 ,Γ S1 ,Γ L1 ,Γ O2 ,Γ S2 ,Γ L2 The measurements were determined to be six single-port measurements.

3. The vector mixer measurement and calibration method based on a reciprocity characteristic calibration device according to claim 2, characterized in that, Step S4 is as follows: The transfer functions for the forward error model and the backward error model are defined as follows: Based on the four S-parameter measurements obtained from the two-port connection of the vector network analyzer, S... 11M S 22M S M12 S M21 The four error terms are solved as follows: E TF =(1-E SF E LF )S M21 (26) E TR =(1-E SR E LR )S M12 (28)。 4. The vector mixer measurement and calibration method based on a reciprocity characteristic calibration device according to claim 3, characterized in that, Step S7 is as follows: The mixer under test (DUT) was measured using a vector network analyzer, and three measured values ​​of the DUT were obtained as SC. 11M SC 22M SC M21 ; Based on the known error term E DF E SF E RF E DR E SR E RR E LF E TFC The three measured values ​​SC 11M SC 22M SC M21 The actual S-parameters of the mixer under test are obtained by making corrections.

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