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Full-rate switched capacitor multi-Tap DFE for long-Tail post-cursor cancellation

Publisher : Midwest Symposium on Circuits and Systems

Campus : Amritapuri

School : School of Engineering

Department : Electronics and Communication

Year : 2017

Abstract : Decision feedback equalizer (DFE) is commonly used in the receiver to cancel out the inter-symbol interference (ISI). However, the capacitive loading at the analog summing node increases with addition of each post-cursor cancellation tap, which directly impacts the bandwidth. In this paper, we propose a multi-Tap switched-capacitor (SC) topology which can cancel out multiple post-cursor content with reduced loading at the analog summing node. Simulation has been implemented in UMC65-nm SP technology for a 4-Tap system, using a triple cascaded B12 channel, having attenuation of 19 dB at nyquist frequency of 2 GHz. Improvements in eye height up to 84% is observed for the eye diagram at the summing node with 4-Tap cancellation compared to 1-Tap cancellation. © 2016 IEEE.

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