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Equalization and near-end crosstalk (NEXT) noise cancellation for 20-Gb/s 4-PAM backplane serial I/O interconnections

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8 Author(s)
Youngsik Hur ; Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA, USA ; Moonkyun Maeng ; Chun, C. ; Bien, F.
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Limitations in current backplane environments impede high-speed data transmission above 5 Gb/s. A system architecture to extend the transmission capacities of legacy backplanes is proposed. The incentives for using a four-level pulse amplitude modulation (4-PAM) scheme are also presented. The architecture is built from feed-forward equalizer and tunable filter elements for near-end crosstalk noise cancellation. Each of the circuits is implemented in a standard 0.18-μm CMOS process. The building blocks of the architecture, which include an LC ladder, a modified Gilbert-cell multiplier with improved headroom, and a tunable active high-pass filter are described in detail. Results of the architecture are shown demonstrating 20-Gb/s 4-PAM signal transmission.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 1 )