Influence of clock structure on EMI level and audio clock jitter during high-speed serial transmission

Abstract

In this study, we investigated the influence of the separate-clock structure and embedded-clock structure on the characteristics of electromagnetic interference (EMI) and audio clock jitter during high-speed serial transmission. We found that the EMI peak spectrum of a separate clock can be reduced by 11 dB if its frequency is decreased. The peak spectrum of transmission when using a separate clock is much lower than that of transmission when using an embedded clock, and results in less audio-clock jitter than transmission using an embedded clock.