8-term error calibration method of n+1 receiver structure vector network analyzer

Abstract

The invention provides an eight-item error calibration method for a vector network analyzer and an N+1 receiver structure. The method comprises: step one, a precision calibration element is used for carrying out insertion type SOLT calibration at a port 1 and a port 2 of a vector network analyzer, thereby obtaining all ten kinds of errors; step two, on the basis of the ten kinds of errors obtained at the step one and a formula (1), switching error items gamma (2,1) and gamma (1,2); step three, solution to the switching error items is carried out and a system error is calculated to obtain eight kinds of errors; step four, with a formula (2), information of directivity, source matching, reflection tracking, and a transmission tracking error of a ten-error model are obtained, and then a load matching error of the ten-error model is obtained by using a formula (4); and step five, a measured element parameter is measured and a system error is used for carrying out correction. According to the invention, under the circumstance that the hardware structure of the vector network analyzer and the N+1 receiver structure is not changed, various eight-error-item-model-based calibration methods are applied.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to an error calibration method for a vector network analyzer. Background technique [0002] The vector network analyzer with N+1 receiver structure refers to the N-port vector network analyzer composed of one reference receiver and N measurement receivers. [0003] For a vector network analyzer with N+1 receiver structure, since it only contains one reference receiver, it cannot contain signals of two or more reference channels (such as a 1 | source＝2 ). The vector network analyzer needs to be calibrated before measuring the device, and the TRL and SOLR in the existing calibration methods are all based on the 8-term error model, and the switching error term is needed in the intermediate calculation process Therefore, the N+1 receiver structure vector network analyzer cannot perform calibrations based on 8-item error models such as TRL and SOLR. [0004] The existing N+1 receive...

AI Technical Summary

Problems solved by technology

The zero-length straight-through calibration defaults the straight-through to 0 attenuation and 0 delay, which reduces the calibration accuracy; defining the straight-through requires precise setting of the straight-through parameters, and it is difficult for the operator to obtain detailed parameters of the straight-through; the adapter removal calibration method is used for calibration The process is cumbersome, usually two-port calibration requires at least 13 steps, which is nearly twice the number of traditional SOLT calibration steps (7 steps)

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