A 125-MHz mixed-signal echo canceller for Gigabit Ethernet on copper wire

Tai-Cheng Lee, B. Razavi
2001 IEEE Journal of Solid-State Circuits  
A discrete-time analog echo canceller is described that reduces the echo in the front end of Gigabit Ethernet twisted-pair interfaces. Echo cancellation in the analog domain by means of four taps reduces the complexity of the digital echo canceller and crosstalk cancellers. Designed in a 0.4-m CMOS technology, the circuit employs an LMS algorithm to adapt to the cable length and impedance discontinuities, providing an echo suppression of 10 dB. The design operates at 125 MHz while consuming 43
more » ... while consuming 43 mW from a 3-V supply. Index Terms-D/A converters, echo cancellers, Gigabit Ethernet, wireline communication.
doi:10.1109/4.910475 fatcat:jmgqwql6bjgftjwyeqhcumknzu