Abstract
A failure analysis process of a circuit with AC (alternating current) noise in the output signal is presented. To find out the root of the failure, the circuit principle and the layout of the circuit were analyzed, and it was found that the layout design was not unreasonable. Specifically, the output signal wire is too close to the clock signal wire, which results in the coupling crosstalk. To eliminate the coupling crosstalk, serval measures including the filter design, replacement of resistor, and layout optimization were adopted. This work has reference significance for the anti-interference design of circuits.
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