A pcb wiring impedance continuity detection method based on fast impulse response

Abstract

The invention discloses a method for detecting the continuity of PCB wiring impedance based on fast impulse response. Taking the control theory as the support point and combining key electrical factors such as impulse response and signal reflection, a differential controller is built to adjust the differential link of the differential controller. Generate a fast step pulse; the main board is powered off, and the fast step pulse is directly introduced into the input terminal of the wiring path to be tested on the PCB board, and a low-pass filter is built to perform high-frequency filtering on the signal at the output end of the wiring path to be tested on the PCB board. Acquisition and discrete sampling; perform Fourier transform on the discrete sampling value of the output signal to obtain the output signal spectrum, and compare it with the converted spectrum of the existing input signal to confirm the impedance discontinuity point on the PCB trace, Adjust the continuity of impedance to solve the problem that the server motherboard cannot have consistent impedance and continuity in the high-speed PCB wiring test, and ensure the high efficiency and low cost of server PCB wiring impedance detection.

Description

technical field [0001] The invention relates to the field of computer communication, in particular to a method for detecting continuity of PCB wiring impedance based on fast impulse response. Background technique [0002] The signal speed design of today's PCB boards is getting higher and higher. The high-speed signals are distributed in various parts of the motherboard and undertake the tasks of system interconnection and information interaction. The design quality of the high-speed signals on the PCB board directly affects the transmission quality of the signal. The continuity of the wiring impedance of the signal determines whether the signal can be smoothly transmitted to the control receiving end. If the wiring impedance is not continuous, there will be signal errors and other phenomena, and the controller will continue to retransmit and interconnect the data, resulting in data The transmission efficiency is low, a set of data needs to be sent multiple times to be trans...

AI Technical Summary

Problems solved by technology

[0005] A method for detecting continuity of PCB wiring impedance based on fast impulse response in the present invention, the technical solution adopted to solve the above technical problems is as follows: The method for detecting continuity of PCB wiring impedance based on fast impulse response uses control theory as a supporting point , combined with key electrical factors such as impulse response and signal reflection, to solve the problem that the current server motherboard cannot have consistent impedance and continuity during the high-speed PCB wiring test process; the main contents of the PCB wiring impedance continuity detection method include:

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