A 160kb/s full duplex digital echo canceling transceiver

Abstract
A report on a 22-pin IC implemented in 3μm, double polysilicon will be presented. The 5V CMOS chip uses a RAM-based echo canceler to provide 160Kb/s full-duplex transmission. The device contains over 49,000 transistors, occupies 27.7 sq mm, and dissipates less than 50mW.

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