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According to the specific environmental noise of the detection system, via holes was caused impedance discontinuities, parasite capacity and inductance which resulted in signal reflection and attenuation, and hence deterioration of signal integrity(SI). The new idea was put in the paper, the specific noise filter was designed on impedance control of via and interconnect. Capacitive coupling of via was considered, and electrical characteristics of hole model was simulated with different PCB plate, and the equivalent circuit model was added to effective parameters by HFSS and ADS collaborative simulation software; The power noise filter was designed and tested. The experiment data showed that the method can be extended to signal detection system with arbitrary single frequency noise interference in.

The Filter Design on Impedance control of Via