A Method of Interpolation and Compensation for Network Analyzer Sub-band Calibration

Abstract

The invention provides a network analyzer sub-band calibration interpolation compensation method, comprising the following steps: Step 1: saving the current setting state of the instrument that affects the calibration effect; Step 2: performing calibration by measuring a standard part; Step 3: calculating the error Coefficient; Step 4: Determine whether the measurement status has changed, if so, enter the calibration interpolation data processing flow, and generate a new error coefficient matrix; otherwise, directly enter Step 5; Step 5: Measure the DUT, connect the DUT, and execute Measurement; Step 6: Error correction, extracting the error coefficient from the error coefficient matrix, selecting an appropriate error model according to different calibration methods, and solving the equation to obtain the true value of the measured part through the measurement data and error coefficient; Step 7: Judging whether to measure Finished, if yes end the program; otherwise return to step 4. By adopting the above-mentioned solution, an appropriate interpolation algorithm is used to calculate the error coefficient of the non-calibration point, so as to complete the error correction.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a sub-band calibration, interpolation and compensation method for a network analyzer. Background technique [0002] Compared with other instruments, the most complex and complete feature of the vector network analyzer is that it has the error correction function. It uses software to make up for the lack of hardware design. By establishing a suitable error model, the calibration is completed using calibration parts with known characteristics. , thus greatly improving the measurement accuracy of the system. [0003] Calibration is a very demanding process. Even the strength of connecting the calibration parts will affect the final test accuracy. Generally speaking, it is not allowed to change the state of the instrument after calibration. After changing the state, it must be recalibrated. However, for the special requirements of some users, such as wanting to measure D...

AI Technical Summary

Problems solved by technology

However, for the special requirements of some users, such as wanting to measure DUTs in different frequency bands at the same time, the requirements for measurement results are not particularly high, but the requirements for measurement efficiency are high, and it is not suitable for multiple calibrations. The current solution is to use similar The error coefficient of the point to complete the error correction or simple interpolation of the calibration data

Using similar points for error correction is likely to cause interpolation errors because the similar points span bands; and the simple interpolation method that only considers the calibration data and does not consider the factors that cause interpolation errors will also have unsatisfactory or even incorrect interpolation results. Happening

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