A 10-Gb/s 5-Tap DFE/4-Tap FFE Transceiver in 90-nm CMOS Technology

This paper presents a 90-nm CMOS 10-Gb/s transceiver for chip-to-chip communications. To mitigate the effects of channel loss and other impairments, a 5-tap decision feedback equalizer (DFE) is included in the receiver and a 4-tap baud-spaced feed-forward equalizer (FFE) in the transmitter. This combination of DFE and FFE permits error-free NRZ signaling over channels with losses exceeding 30 dB. Low jitter clocks for the transmitter and receiver are supplied by a PLL with LC VCO. Operation at 10-Gb/s with good power efficiency is achieved by using half-rate architectures in both transmitter and receiver. With the transmitter producing an output signal of 1200 mVppd, one transmitter/receiver pair and one PLL consume 300 mW. Design enhancements of a half-rate DFE employing one tap of speculative feedback and four taps of dynamic feedback allow its loop timing requirements to be met. Serial link experiments with a variety of test channels demonstrate the effectiveness of the FFE/DFE equalization.

By: John F. Bulzacchelli; Mounir Meghelli; Sergey V. Rylov; Woogeun Rhee; Alexander V. Rylyakov; Herschel A. Ainspan; Benjamin D. Parker; Michael P. Beakes; Aichin Chung; Troy J. Beukema; Petar K. Pepeljugoski; Lei Shan; Young H. Kwark; Sudhir Gowda; Daniel J. Friedman

Published in: RC23974 in 2006


This Research Report is available. This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specific requests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g., payment of royalties). I have read and understand this notice and am a member of the scientific community outside or inside of IBM seeking a single copy only.


Questions about this service can be mailed to reports@us.ibm.com .