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8-Gb/s source-synchronous I/O link with adaptive receiver equalization, offset cancellation, and clock de-skew

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8 Author(s)
J. E. Jaussi ; Circuits Res., Intel Labs., Hillsboro, OR, USA ; G. Balamurugan ; D. R. Johnson ; B. Casper
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A source-synchronous I/O link with adaptive receiver-side equalization has been implemented in 0.13-μm bulk CMOS technology. The transceiver is optimized for small area (360 μm × 360 μm) and low power (280 mW). The analog equalizer is implemented as an 8-way interleaved, 4-tap discrete-time linear filter. The equalization improved the data rate of a 102 cm backplane interconnect by 110%. On-die adaptive logic determines optimal receiver settings through comparator offset cancellation, data alignment of the transmitter and receiver, clock de-skew and setting filter coefficients for equalization. The noise-margin degradation due to statistical variation in converged coefficient values was less than 3%.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:40 ,  Issue: 1 )