A 4-tap 125-MHz mixed-signal echo canceller for Gigabit Ethernet on copper wire

Tai-Cheng Lee, B. Razavi
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引用次数: 3

Abstract

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 by 50 taps. Designed in a 0.4 /spl mu/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 mW from a 3 V supply.
4分路125兆赫混合信号回波消除器,用于千兆以太网铜线
介绍了一种离散时间模拟回波消除器,用于减少千兆以太网双绞线接口前端的回波。模拟域的四分频回声消除使数字回声消除器和串扰消除器的复杂度降低了50分频。该电路采用0.4 /spl mu/m CMOS技术,采用LMS算法来适应电缆长度和阻抗不连续,提供10 dB的回波抑制。该设计工作在125 MHz,同时从3 V电源消耗43 mW。
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