Multi-port differential transmission channel jitter test analysis method

Abstract

The invention discloses a multi-port differential transmission channel jitter test analysis method. The method comprises steps that s1, a detected member is connected with a multi-port vector networkanalyzer, and the multi-port vector network analyzer is calibrated; s2, the multi-port vector network analyzer is utilized to acquire an S parameter of the detected member; s3, the S parameter of thedetected member is converted into a mixed-mode S parameter; s4, the mixed-mode S parameter is converted into time domain impulse response; s5, a test code type signal is generated, convolution operation of the test code type signal and the time domain impulse response is carried out to acquire a response signal; jitter decomposition and analysis of the response signal are carried out to acquire ajitter index. Multi-port differential channel jitter analysis is carried out based on the vector network analyzer, a measurement error caused by clock synchronization among oscilloscope channels is reduced, and test difficulty caused by the limited number of oscilloscope ports is further avoided. The method is advantaged in that influence of the excitation signal error on the differential transmission channel jitter test can be avoided, and jitter test precision is improved.

Description

technical field [0001] The invention relates to a test and analysis method for multi-port differential transmission channel jitter. Background technique [0002] Vector network analyzers (hereinafter referred to as "vector network") are widely used in multi-port and differential testing. YANI itself has an excitation source and a receiver at the same time. Connect the YANI port and the DUT through a cable, and YANI sends the excitation signal to the DUT, and calculates the S parameters after obtaining the information through the reference receiver and the measurement receiver. , and then convert the S-parameters into mixed-mode S-parameters through the formula. Mixed-mode S-parameters can be used to evaluate the frequency-domain characteristics of multi-port differential transmission channels. However, the jitter analysis is carried out in the time domain. It is necessary to convert the mixed-mode S parameters from the frequency domain to the time domain (such as the IFFT ...

AI Technical Summary

Problems solved by technology

For the jitter analysis of multi-port (4 or more ports) differential transmission channels, due to the limited number of ports of the oscilloscope, multi-port jitter analysis is difficult and inefficient

At the same time, an oscilloscope is used to analyze and test the jitter of the high-speed data transmission channel. The error of the excitation signal will inevitably be introduced into the test results, which will affect the accuracy of the jitter test of the differential transmission channel.

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