Test Point Selection and Analysis of High Speed Clock Signal
In order to achieve accurate discrimination of high-speed clock signal quality,this paper analyzes the influence of transmission line reflection on clock signal quality and transmission delay based on the analysis of transmission line impedance matching principle.Taking a pair of PCIE reference clock signals as an example,mod-eling and simulation of clock signal transmission link are carried out.Compared the signal at the pin of crystal os-cillator with the signal at the pin of terminal resistance,it is found that the monotone of the clock signal at the ter-minal matching resistance pin is better.Therefore,it is proposed that the test point of the terminal matching resist-ance pin is the best choice for high-speed clock signal,so as to reduce the impact of transmission line reflection and facilitate the debugging and production of products.
clock signal testingtransmission line reflectiontest point
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