Equalization and near-end crosstalk (NEXT) noise cancellation for 20-Gb/s 4-PAM backplane serial I/O interconnections
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- Equalization and near-end crosstalk (NEXT) noise cancellation for 20-Gb/s 4-PAM backplane serial I/O interconnections
- Hur, Y; Maeng, M; Chun, C; Bien, F; Kim, H; Chandramouli, S; Gebara, E; Laskar, J
- backplane; equalization; finite impulse response (FIR) filter; four-level pulse amplitude modulation (4-PAM); input/output (I/O)
- Issue Date
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.53, no.1, pp.246 - 255
- Limitations in current backplane environments impede high-speed data transmission above 5 Gb/s. In this paper, 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-mum-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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