Methods of eye-pattern window improvement using reflections caused by impedance mismatch: post-emphasis technique

摘要

In this paper, methods of eye-pattern improvement for Gbps class serial signals by waveform emphasis at a receiver are proposed. Intentional impedance mismatch reflections can be caused by inserting high-impedance element between a receiver input with high-impedance connecting to a transmission line and a termination matched to the transmission line. In SPICE simulations at 5Gbps with 1m PCB lines, it is confirmed that eye-pattern window height is improved from 13 % to 66 % and jitter from 0.6UI to 0.075UI.