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
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