Method for detecting continuity of wiring impedance of PCB based on rapid pulse response

Abstract

The invention discloses a method for detecting continuity of wiring impedance of a PCB based on rapid pulse response. The method comprises the steps of constructing a differential controller by taking the control theory as the supporting point and combining key electric factors such as pulse response and signal reflection, and regulating a differential link of the differential controller to generate a rapid step pulse; cutting off power of a mainboard, directly introducing the rapid step pulse to the input end of a wiring path to be detected on the PCB, constructing a low pass filter, performing high frequency filtering and collection on a signal at the output end of the wiring path to be detected on the PCB, and performing discrete sampling; performing Fourier transform on a discrete sampling value of the signal at the output end to obtain an output signal frequency spectrum, comparing the output signal frequency spectrum with the existing frequency spectrum obtained after transformation of an input signal to determine discontinuous points of impedance on a wire of the PCB, and performing continuity regulation on the impedance. By means of the method, the problem that uniform continuity of the impedance cannot be achieved when the server mainboard is in a high-speed PCB wiring test is solved, and high efficiency and low cost detection on the wiring impedance of the server PCB is ensured.

Description

[0001] technical field [0002] 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 [0003] 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...

AI Technical Summary

Problems solved by technology

[0006] 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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