Patent ID: 8917800
Filing Date: 2014-12-23
Classification: H04B,H04L

Abstract:
1. A semiconductor device, comprising: a receiver circuit which includes a receiver receiving high-speed serial data, a clock data recovery circuit restoring a clock from received serial data, a deserializer performing serial to parallel conversion of the received data, and an offset optimization control circuit detecting offset relative to DC balance in an arbitrary section of the received data, and adjusting DC offset of the receiver, wherein the offset optimization control circuit includes an averaging circuit averaging the received data in the arbitrary section, and an offset detection circuit detecting DC offset between a DC balance of the received data obtained by the averaging circuit and a DC level, the offset optimization control circuit adjusts DC offset of the receiver in accordance with the detected DC offset, and the offset optimization control circuit shifts offset by one level toward the H side when the offset exceeds one + side threshold from the DC level, and shifts offset by one level toward the L side when the offset exceeds one − side threshold from the DC level, based on the offset value received from the offset detection circuit.