A Multiport Automatic Fixture Loss and Phase Compensation Method Based on Straight-Through Line

Abstract

The present invention proposes a multi-port automatic fixture loss and phase compensation method based on the straight-through line, using the time domain method to obtain the phase offset, combining the radial basis neural network to fit the loss of the straight-through line, and combining the coaxial reference surface with the measured The effect of the through-line fixture between the component reference planes is removed, and the scattering parameters of the multi-port DUT are obtained. The method of the present invention is based on the multi-port automatic fixture loss and phase compensation of the straight-through line, does not need to use a variety of calibration parts for de-embedding calculations, reduces the requirements for the calibration parts and the complexity of the calculation, and is simple in design and implementation; Automatic loss and phase compensation algorithms are implemented for multi-port non-coaxial fixtures to improve S-parameter test accuracy and remove the influence of fixtures on test results.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a multi-port automatic fixture loss and phase compensation method based on straight-through lines. Background technique [0002] In recent years, in the fields of Ethernet, 5G mobile communication and satellite navigation, high-speed circuit boards, backplanes, connectors and high-speed digital cables have been widely used. In these fields, differential multi-port forms are mostly used for high-speed signal transmission, and the interfaces are in many cases non-coaxial. Therefore, it is very important for the construction of the system to test the high-precision scattering parameters of such devices. One of the key points of the test is that the instrument can perform automatic error calibration and de-embedding. [0003] At present, among several mainstream electronic test instrument manufacturers, only Keysight (formerly Agilent) software provides automatic port extension func...

AI Technical Summary

Problems solved by technology

[0003] At present, among several mainstream electronic test instrument manufacturers, only Keysight (formerly Agilent) software provides automatic port extension function, but this function still requires coaxial standard parts such as opener or short circuit and cannot be directly applied to non-coaxial devices, and there is no report on extending the method to multi-port devices for de-embedding

However, Rohde & Schwarz of Germany and Anritsu of Japan have not launched an automatic fixture loss and phase compensation de-embedding solution for their vector network analyzers. They can only manually set the loss and phase for simple compensation, which is complicated to operate and has little user experience. High standard

[0004] Existing calibration de-embedding methods, such as SOLT, SOLR and TRL, etc., some methods can only be used on the coaxial port, and some methods are complicated to design and use calibration parts

[0005] Moreover, in the existing solutions, the de-embedding of multi-port devices requires the use of various calibration components such as short circuit, open circuit, load and through, and various standard components need to be completed multiple times during the de-embedding process, which takes a long time and is inefficient

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