Phase calculation method applied to fixture parameter extraction

Abstract

The invention discloses a phase calculation method applied to fixture parameter extraction and belongs to the test technology field. The phase calculation method applied to fixture parameter extraction comprises steps that a phase value is obtained through a real part and a imaginary part of each frequency point S parameter; the phase of each frequency point S parameter is linearly expanded; the phase is subjected to threshold determination; the slope of phase change is calculated; the offset phase is calculated through utilizing the 0-frequency down phase; the phase of the square root is calculated. The method is advantaged in that knowing delay of the fixture in advance is needed, manually inputting parameters is not required for solving, test steps are reduced, and test efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a phase calculation method applied to fixture parameter extraction. Background technique [0002] With the development of electronic information technology, the packaging forms and interface types of devices are also increasing. When using a network analyzer to test such devices, it is necessary to introduce a fixture. Therefore, it is necessary to eliminate the influence of the fixture during the test. In the prior art, fixture parameters can be quickly extracted by means of time-domain analysis, but the square root of S parameters is required in the process of extracting parameters. For the square root of a complex number, it is necessary to judge its phase, which is usually determined by artificially inputting a delay value. [0003] Now that there are more and more connectors, the testing requirements are also increasing. In the face of various devices and con...

AI Technical Summary

Problems solved by technology

Direct processing, there are two problems in the obtained fixture phase parameters: 1. The phase is folded, that is, the phase is between +180° and -180°. After the direct square root, the phase will be between +90° and -90° Folding; 2. The offset of the initial phase corresponding to the first frequency point is unknown, so after the square root, the offset part is missing

The disadvantage is that the delay of the fixture needs to be known in advance and requires human input

Since the fixture itself is difficult to measure, the delay of the fixture cannot be accurately obtained

And the human input process increases the operation steps, reducing the test efficiency

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