Patent ID: 7583753
Filing Date: 2009-09-01
Classification: H04L

Abstract:
1. An adaptive pre-emphasis apparatus comprising: a pre-emphasis circuit configured to pre-emphasize a serial data stream based on a pre-emphasis control value to transmit the pre-emphasized serial data stream to a receiver via a first transmission line; a pre-emphasis controller configured to receive measured values of transmission errors of the pre-emphasized serial data stream from the receiver via a second transmission line, and configured to set the pre-emphasis control value corresponding to a minimum measured value of the transmission errors, to an optimum pre-emphasis control value; wherein the pre-emphasis circuit comprises an output driver configured to receive serialized first input data and second input data that are inverted data of the serialized first input data, and configured to differentially amplify the first and the second input data; and wherein the pre-emphasis circuit further comprises a pre-emphasis driver configured to receive third input data that are delayed data of the first input data by a predetermined time period and fourth input data that are inverted data of the third input data, and configured to pre-emphasize the third and the fourth input data based on a pre-emphasis strength value to output the pre-emphasized third and fourth input data.