CN112485740A - Method for realizing automatic port identification of electronic calibration part based on amplitude difference values of various impedance states - Google Patents
Method for realizing automatic port identification of electronic calibration part based on amplitude difference values of various impedance states Download PDFInfo
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Abstract
The invention relates to a method for realizing automatic port identification of an electronic calibration piece based on amplitude difference values of various impedance states, which comprises the steps of obtaining measurement parameters at the x-th port of a vector network analyzer, respectively switching an impedance switch corresponding to the n-th port of the electronic calibration piece into a first impedance state and a fourth impedance state, respectively obtaining the amplitude average value of the two impedance states, and calculating the amplitude difference value of the two impedance states; and if the amplitude difference value meets the amplitude difference value of the threshold condition, connecting the x-th port of the vector network analyzer with the n-th port of the electronic calibration piece. By adopting the method for realizing the automatic port identification of the electronic calibration part based on the amplitude difference values of various impedance states, the amplitude difference values of two impedance states are measured by controlling different impedance states in the electronic calibration part, and a typical amplitude threshold value is set for cyclic detection judgment, so that the port connection relationship between the vector network analyzer and the electronic calibration part can be accurately obtained, and the method has wide application range.
Description
Technical Field
The invention relates to the technical field of electronic test, in particular to the field of port identification of an electronic calibration piece, and specifically relates to a method for realizing automatic port identification of the electronic calibration piece based on amplitude difference values of various impedance states.
Background
Among the prior art, thereby vector network analyzer need calibrate through calibration piece and improve measurement accuracy, compares with traditional mechanical calibration piece, and all calibrations just can be accomplished to electron calibration piece only need once to connect, and calibration operation process is quick simple, reduces calibration time, can guarantee the calibration accuracy simultaneously. When the multi-port electronic calibration piece is connected with the port of the vector network analyzer, the ports can be randomly connected in a pairing manner, so that an automatic identification method for the connection relationship between the port of the electronic calibration piece and the port of the vector network analyzer is urgently needed in the prior art, and the purpose of quickly and accurately judging which port of the vector network analyzer and the electronic calibration is connected is achieved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for realizing automatic port identification of an electronic calibration part based on amplitude difference values of various impedance states, which has the advantages of high accuracy, high precision and wide application range.
In order to achieve the above object, the method for automatically identifying the port of the electronic calibration part based on the amplitude difference values of various impedance states of the invention comprises the following steps:
the method for realizing automatic port identification of the electronic calibration part based on the amplitude difference values of various impedance states is mainly characterized by comprising the following steps of:
(1) obtaining a measurement parameter at an X-th port of the vector network analyzer, respectively switching an impedance switch corresponding to an N-th port of the electronic calibration piece into a first impedance state and a fourth impedance state, respectively obtaining an amplitude average value of the two impedance states, and calculating an amplitude difference value of the two impedance states, wherein N is less than or equal to N, N is the port number of the electronic calibration piece, N is more than or equal to 2, X is less than or equal to X, X is the port number of the vector network analyzer, and X is more than or equal to 2;
(2) judging whether the amplitude difference value meets the threshold condition or not, if so, connecting the x-th port of the vector network analyzer with the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is not connected with the n-th port of the electronic calibration piece.
Preferably, the method further comprises the steps of:
(3) judging whether the connection relations of all ports of the electronic calibration piece are identified or not, and if so, finishing the steps; otherwise, continuing the step (4);
(4) and (4) switching the next port of the electronic calibration piece, and continuing to the step (1).
Preferably, the method further comprises the steps of:
(5) judging whether the connection relations of all ports of the vector network analyzer are identified or not, and if so, finishing the steps; otherwise, continuing the step (6);
(6) and (4) switching the next port of the vector network analyzer and continuing to the step (1).
Preferably, the step (1) specifically comprises the following steps:
(1.1) carrying out reflection measurement on the x-th port of the vector network analyzer to obtain a measurement parameter;
(1.2) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a first impedance state, and after scanning is finished, an amplitude average value PxEn _ M1 is obtained through measurement;
(1.3) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a fourth impedance state, and amplitude average value PxEn _ M4 is obtained through measurement;
(1.4) calculating an amplitude difference value PxEn _ Mc from the amplitude average values PxEn _ M1 and PxEn _ M4.
Preferably, the step (1.4) of calculating the amplitude difference PxEn _ Mc includes:
the amplitude difference value PxEn _ Mc is calculated according to the following formula:
PxEn_Mc＝PxEn_M4－PxEn_M1；
wherein, PxEn _ M1 is an average value of the amplitude of the nth port of the electronic calibration piece in the first impedance state, and PxEn _ M4 is an average value of the amplitude of the nth port of the electronic calibration piece in the fourth impedance state.
Preferably, the step (2) specifically comprises the following steps:
judging whether the amplitude difference value PxEn _ Mc is smaller than an amplitude difference value comparison threshold value Mlimit, if so, disconnecting the x-th port of the vector network analyzer from the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is connected with the n-th port of the electronic calibration piece.
Preferably, the standard measurement value of each impedance state of the electronic calibration piece is stored in an internal flash memory.
By adopting the method for realizing the automatic port identification of the electronic calibration part based on the amplitude difference values of various impedance states, the amplitude difference values of two impedance states are measured by controlling different impedance states in the electronic calibration part, and a typical amplitude threshold value is set for cyclic detection and judgment, so that the port connection relation between a vector network analyzer and the electronic calibration part can be accurately obtained, the automatic port connection relation identification is realized, and the method has wide application range.
Drawings
Fig. 1 is a schematic diagram of internal impedance states of an electronic calibration piece according to the method for automatically identifying ports of the electronic calibration piece based on amplitude difference values of multiple impedance states.
Fig. 2 is a schematic diagram of the amplitude measurement result of the first impedance state inside the electronic calibration piece according to the method for automatically identifying the port of the electronic calibration piece based on the amplitude difference values of the plurality of impedance states.
Fig. 3 is a schematic diagram illustrating the amplitude measurement result of the fourth impedance state inside the electronic calibration piece according to the method for automatically identifying the port of the electronic calibration piece based on the amplitude difference values of the plurality of impedance states.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The invention discloses a method for realizing automatic port identification of an electronic calibration part based on amplitude difference values of various impedance states, which comprises the following steps:
(1) obtaining a measurement parameter at an X-th port of the vector network analyzer, respectively switching an impedance switch corresponding to an N-th port of the electronic calibration piece into a first impedance state and a fourth impedance state, respectively obtaining an amplitude average value of the two impedance states, and calculating an amplitude difference value of the two impedance states, wherein N is less than or equal to N, N is the port number of the electronic calibration piece, N is more than or equal to 2, X is less than or equal to X, X is the port number of the vector network analyzer, and X is more than or equal to 2;
(1.1) carrying out reflection measurement on the x-th port of the vector network analyzer to obtain a measurement parameter;
(1.2) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a first impedance state, and after scanning is finished, an amplitude average value PxEn _ M1 is obtained through measurement;
(1.3) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a fourth impedance state, and amplitude average value PxEn _ M4 is obtained through measurement;
(1.4) calculating an amplitude difference value PxEn _ Mc from the amplitude average values PxEn _ M1 and PxEn _ M4;
(2) judging whether the amplitude difference value meets the threshold condition or not, if so, connecting the x-th port of the vector network analyzer with the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is not connected with the n-th port of the electronic calibration piece.
Preferably, the method further comprises the steps of:
(3) judging whether the connection relations of all ports of the electronic calibration piece are identified or not, and if so, finishing the steps; otherwise, continuing the step (4);
(4) and (4) switching the next port of the electronic calibration piece, and continuing to the step (1).
Preferably, the method further comprises the steps of:
(5) judging whether the connection relations of all ports of the vector network analyzer are identified or not, and if so, finishing the steps; otherwise, continuing the step (6);
(6) and (4) switching the next port of the vector network analyzer and continuing to the step (1).
As a preferred embodiment of the present invention, in the step (1.4), the amplitude difference PxEn _ Mc is calculated, specifically:
the amplitude difference value PxEn _ Mc is calculated according to the following formula:
PxEn_Mc＝PxEn_M4－PxEn_M1；
wherein, PxEn _ M1 is an average value of the amplitude of the nth port of the electronic calibration piece in the first impedance state, and PxEn _ M4 is an average value of the amplitude of the nth port of the electronic calibration piece in the fourth impedance state.
As a preferred embodiment of the present invention, the step (2) specifically comprises the following steps:
judging whether the amplitude difference value PxEn _ Mc is smaller than an amplitude difference value comparison threshold value Mlimit, if so, disconnecting the x-th port of the vector network analyzer from the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is connected with the n-th port of the electronic calibration piece.
In a preferred embodiment of the present invention, the standard measurement value of each impedance state of the electronic calibration member is stored in an internal flash memory.
In a specific embodiment of the present invention, an automatic port identification method for an electronic calibration part is provided, in which 2 or more than 2 reflection amplitude measurement values of different impedance states in the electronic calibration part are respectively measured, and a difference value of the amplitudes of the different impedance states is compared with a preset amplitude difference threshold value, so as to automatically identify the port of the electronic calibration part.
The multi-port vector network analyzer controls the impedance state inside each port inside the multi-port electronic calibration piece through software, analyzes and judges the amplitude difference value of different impedance states inside all ports of the electronic calibration piece, and judges that the measurement port of the vector network analyzer is connected with the port of the electronic calibration piece at the moment if the amplitude difference value meets a threshold condition. And circularly performing amplitude difference values of the internal impedance states of all the ports of the vector network analyzer and all the ports of the electronic calibration piece by adopting the same method to obtain the connection relation between the measurement ports of the vector network analyzer and the ports of the electronic calibration piece. By the identification method, the connection relation between the port of the vector network analyzer and the port of the electronic calibration piece can be quickly and accurately obtained, so that the internal impedance switch of the electronic calibration piece is accurately controlled, and the standard measurement data of the impedance state of the corresponding port is accurately obtained.
The electronic calibration piece can replace a mechanical calibration piece to correct and calibrate the system error of the vector network analyzer. The vector network analyzer is calibrated through the electronic calibration piece, so that the calibration speed can be increased, the cable connection times are reduced, and the test error caused by connecting cables for many times is reduced.
When the electronic calibration piece is used for calibrating the vector network analyzer, the port of the electronic calibration piece and the port of the vector network analyzer can be connected in a pairing mode at will without one-to-one corresponding connection. For example, when the two-port electronic calibration component is connected to the two-port vector network analyzer, the first port and the second port of the electronic calibration component may be connected to the first port and the second port of the vector network analyzer, or the first port of the electronic calibration component may be connected to the second port of the vector network analyzer, and the second port of the electronic calibration component may be connected to the first port of the vector network analyzer. The multi-port vector network analyzer and the multi-port electronic calibration piece can be connected with different ports in any combination when being connected.
Inside each port of the electronic calibration piece, a plurality of different impedance states are arranged, and standard measurement values of each impedance state are stored in a flash memory inside the electronic calibration piece.
When the vector network analyzer is calibrated through the electronic calibration piece, an internal switch of the electronic calibration piece needs to be controlled to be switched to different impedance states, standard measurement values of different impedance states in each port of the electronic calibration piece are obtained, error correction is carried out on the vector network analyzer through the standard values, and an accurate measurement result can be obtained only after system errors and cable connection errors are eliminated.
Therefore, the connection relationship between the port of the vector network analyzer and the port of the electronic calibration piece needs to be judged. If the judgment of the port connection relation is wrong, the impedance switch cannot be accurately controlled, and the vector network analyzer has large measurement error and inaccurate measurement result due to the adoption of wrong impedance state standard measurement data. Therefore, a port connection judgment method is needed to accurately identify the port connection relationship between the port of the vector network analyzer and the port of the electronic calibration component.
The schematic diagram of the principle of the various impedance states inside the electronic calibration piece is shown in fig. 1, and each port can be switched to different impedance states by a software-controlled switch.
Amplitude values of a plurality of impedance states can be measured, and judgment is carried out through amplitude differences of the plurality of impedance states to obtain the port connection relation. Taking the amplitude difference calculation of the two impedance states as an example, assuming that the first impedance state inside the electronic calibration piece is a matched load state, the reflected amplitude measurement is shown in fig. 2. The fourth impedance state is an open circuit state and the reflected amplitude measurements are as in fig. 3. It can be seen that the amplitude value measurements for these two impedance states differ significantly.
By switching the impedance switch inside the electronic calibration piece into the first impedance state and the fourth impedance state, respectively, the amplitude average values M1 and M4 of the two impedance states are obtained, respectively. The magnitude difference Mc of the two impedance states is calculated:
Mc＝M4－M1……(1)
if the electronic calibration piece is connected with the port of the vector network analyzer, the value of Mc is larger. If the electronic calibration piece is not connected with the port of the vector network analyzer, the amplitude measurement results of the two measurements are basically the same, and the value of Mc is about 0. Therefore, whether the ports of the vector network analyzer and the electronic calibration part are connected or not can be accurately judged.
According to the magnitude of the amplitude difference between the two impedance states of the electronic calibration component, an amplitude difference comparison threshold value Mlimit can be set.
The invention relates to a method for judging the connection relationship between a port of a vector network analyzer and a port of an electronic calibration piece, which comprises the following steps:
(1) firstly, software sets a vector network analyzer to perform reflection measurement on a first port (P1), parameters are measured S11, an internal switch of a port (E1) of a first electronic calibration piece is controlled to be switched to a first impedance state, and after the vector network analyzer completes scanning, an amplitude average value P1E1_ M1 is obtained through measurement. And then controlling an internal switch of the port of the first electronic calibration piece to switch to a fourth impedance state, measuring to obtain an amplitude average value P1E1_ M4, and calculating an amplitude difference value P1E1_ Mc.
P1E1_Mc＝P1E1_M4－P1E1_M1……(2)
If P1E1_ Mc is larger than or equal to Mlimit, the connection between the first port of the vector network analyzer and the port of the first electronic calibration piece can be judged.
(2) If P1E1_ Mc is less than Mlimit, the first port of the vector network analyzer is not connected with the port of the first electronic calibration piece, the internal switch of the port of the second electronic calibration piece is controlled to be switched to the first impedance state, and after the vector network analyzer completes scanning, the amplitude average value P1E2_ M1 is obtained through measurement. And then controlling an internal switch of the port of the second electronic calibration piece to switch to a fourth impedance state, measuring to obtain an amplitude average value P1E2_ M4, and calculating an amplitude difference value P1E2_ Mc.
P1E2_Mc＝P1E2_M4－P1E2_M1……(3)
If P1E2_ Mc ≧ Mlimit, the vector network analyzer first port and the second electronic calibrator port are connected. If P1E2_ Mc < Mlimit, it is indicated that the vector network analyzer first port and the second electronic calibration part port are not connected.
(3) For the N (N is more than or equal to 2) port electronic calibration piece, the same method is adopted to switch the first impedance state and the fourth impedance state inside the port N of the electronic calibration piece, the amplitude difference value of the impedance state inside the port N of the electronic calibration piece is obtained, and whether the first port of the vector network analyzer is connected with the port N of the electronic calibration piece is judged.
(4) And after the connection relation between the first port of the vector network analyzer and all the ports of the electronic calibration piece is judged, judging the connection relation between the second port of the vector network analyzer and all the ports of the electronic calibration piece.
(5) The vector network analyzer measurement parameters are changed to S22 and a second port (P2) measurement is made. And controlling an internal switch of a port (E1) of the first electronic calibration piece to be switched to a first impedance state, and measuring to obtain an amplitude average value P2E1_ M1 after the scanning of the vector network analyzer is finished. And then controlling an internal switch of the port of the first electronic calibration piece to switch to a fourth impedance state, measuring to obtain an amplitude average value P2E1_ M4, and calculating an amplitude difference value P2E1_ Mc.
P2E1_Mc＝P2E1_M4－P2E1_M1……(4)
If P2E1_ Mc ≧ Mlimit, the vector network analyzer second port and the first electronic calibrator port are connected.
(6) And if the P2E1_ Mc is less than Mlimit, the second port of the vector network analyzer is not connected with the port of the first electronic calibration piece, the internal switch of the port of the second electronic calibration piece is controlled to be switched to the first impedance state, and after the vector network analyzer completes scanning, the amplitude average value P2E2_ M1 is obtained through measurement. And then controlling an internal switch of the port of the second electronic calibration piece to switch to a fourth impedance state, measuring to obtain an amplitude average value P2E2_ M4, and calculating an amplitude difference value P2E2_ Mc.
P2E2_Mc＝P2E2_M4－P2E2_M1……(5)
If P2E2_ Mc ≧ Mlimit, the vector network analyzer first port and the second electronic calibrator port are connected. If P2E2_ Mc < Mlimit, the vector network analyzer first port and the second electronic calibration part port are not connected.
(7) For the N (N is more than or equal to 2) port electronic calibration piece, the same method is adopted to switch the first impedance state and the fourth impedance state inside the port N of the electronic calibration piece, the amplitude difference value of the impedance state inside the port N of the electronic calibration piece is obtained, and whether the first port of the vector network analyzer is connected with the port N of the electronic calibration piece is judged.
(8) For a multi-port vector network analyzer with X (X is more than or equal to 2) ports, changing the measurement ports of the sequential vector network analyzer by the same method, circularly carrying out impedance state amplitude difference measurement calculation by the same method and N ports of the electronic calibration piece, and judging the connection relation between all the ports of the X-port vector network analyzer and all the ports of the electronic calibration piece.
(9) The method is used for automatically identifying the connection relationship between the vector network analyzer and all the ports of the electronic calibration piece.
By adopting the method for realizing the automatic port identification of the electronic calibration part based on the amplitude difference values of various impedance states, the amplitude difference values of two impedance states are measured by controlling different impedance states in the electronic calibration part, and a typical amplitude threshold value is set for cyclic detection and judgment, so that the port connection relation between a vector network analyzer and the electronic calibration part can be accurately obtained, the automatic port connection relation identification is realized, and the method has wide application range.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (7)
1. A method for realizing automatic port identification of an electronic calibration part based on amplitude difference values of multiple impedance states is characterized by comprising the following steps:
(1) obtaining a measurement parameter at an X-th port of the vector network analyzer, respectively switching an impedance switch corresponding to an N-th port of the electronic calibration piece into a first impedance state and a fourth impedance state, respectively obtaining an amplitude average value of the two impedance states, and calculating an amplitude difference value of the two impedance states, wherein N is less than or equal to N, N is the port number of the electronic calibration piece, N is more than or equal to 2, X is less than or equal to X, X is the port number of the vector network analyzer, and X is more than or equal to 2;
(2) judging whether the amplitude difference value meets the threshold condition of the amplitude difference value, if so, connecting the x-th port of the vector network analyzer with the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is not connected with the n-th port of the electronic calibration piece.
2. The method of claim 1, further comprising the steps of:
(3) judging whether the connection relations of all ports of the electronic calibration piece are identified or not, and if so, finishing the steps; otherwise, continuing the step (4);
(4) and (4) switching the next port of the electronic calibration piece, and continuing to the step (1).
3. The method of claim 2, further comprising the steps of:
(5) judging whether the connection relations of all ports of the vector network analyzer are identified or not, and if so, finishing the steps; otherwise, continuing the step (6);
(6) and (4) switching the next port of the vector network analyzer and continuing to the step (1).
4. The method for realizing automatic port identification of an electronic calibration member based on amplitude difference values of multiple impedance states as claimed in claim 1, wherein the step (1) specifically comprises the following steps:
(1.1) carrying out reflection measurement on the x-th port of the vector network analyzer to obtain a measurement parameter;
(1.2) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a first impedance state, and after scanning is finished, an amplitude average value PxEn _ M1 is obtained through measurement;
(1.3) the vector network analyzer controls an internal switch of an nth port of the electronic calibration piece to be switched to a fourth impedance state, and amplitude average value PxEn _ M4 is obtained through measurement;
(1.4) calculating an amplitude difference value PxEn _ Mc from the amplitude average values PxEn _ M1 and PxEn _ M4.
5. The method for realizing automatic port identification of an electronic calibration part based on amplitude difference values of multiple impedance states as claimed in claim 4, wherein the step (1.4) of calculating the amplitude difference value PxEn _ Mc specifically comprises:
the amplitude difference value PxEn _ Mc is calculated according to the following formula:
PxEn_Mc＝PxEn_M4－PxEn_M1；
wherein, PxEn _ M1 is an average value of the amplitude of the nth port of the electronic calibration piece in the first impedance state, and PxEn _ M4 is an average value of the amplitude of the nth port of the electronic calibration piece in the fourth impedance state.
6. The method for realizing automatic port identification of an electronic calibration member based on amplitude difference values of multiple impedance states as claimed in claim 1, wherein the step (2) specifically comprises the following steps:
judging whether the amplitude difference value PxEn _ Mc is smaller than an amplitude difference value comparison threshold value Mlimit, if so, disconnecting the x-th port of the vector network analyzer from the n-th port of the electronic calibration piece; otherwise, the x-th port of the vector network analyzer is connected with the n-th port of the electronic calibration piece.
7. The method of claim 1, wherein the standard measurement values for each impedance state of the electronic calibration piece are stored in an internal flash memory.
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