Transmitter equalization method and apparatus

摘要

A current mode output driver includes a pre-driver for pre-equalization. The current mode output driver drives a transmission line with an alternating current (AC) signal and a direct current (DC) signal. Characteristics of the transmission line are measured by comparing a received amplitude of the AC signal and a received amplitude of the DC signal. A ratio of the AC received amplitude to the DC received amplitude is compared to ratios derived from possible equalization settings to determine an equalization setting appropriate to equalize the channel.