Impact of Differential-mode Noise Converted from External RF Noise on Differential Transmission and its Reduction by Differential Signal Balancer

Abstract

The impact of differential-mode noise converted from RF noise applied to the differential transmission line channel (DTLC) due to the common-mode filter (CMF) and glass cloth in the DTLC substrate is analyzed. The differential mode noise generated in DTLC with CMF is measured with a 4-port network analyzer. Based on this measurement result, the influence of glass cloth is incorporated into the electromagnetic simulation model of DTLC. By applying this DTLC model to circuit analysis, the suitability of various CMFs as solutions for RF interference is evaluated.