Concurrent digital Adaptive Decision Feedback Equalizer for 10GBase-LX4 Ethernet system

Abstract

An all digital 3.5Gbps blind Adaptive Decision Feedback Equalizer (ADFE) is designed for 10GBase-LX4 IEEE 802.3ae standard. It uses 5 parallel equalization blocks each with 6 taps and 4 taps for each Feed-Forward Equalizer (FFE) and Feed-Back Equalizer (FBE). This concurrent ADFE has core area of 0.864 x 0.864 mm(2) with operation up to 3.5 Gbps using 1.2-V supply in a 0.13 um CMOS process. It dissipates 94 mW when working at 3.125 Gbps.