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

Author

Hur, Youngsik ; Maeng, Moonkyun ; Chun, Carl ; Bien, Franklin ; Kim, Hyoungsoo ; Chandramouli, Soumya ; Gebara, Edward ; Laskar, Joy

Author_Institution

Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA, USA

Volume

53

Issue

1

fYear

2005

Firstpage

246

Lastpage

255

Abstract

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.

Keywords

CMOS integrated circuits; active filters; crosstalk; equalisers; frequency multipliers; high-pass filters; integrated circuit interconnections; interference suppression; ladder filters; pulse amplitude modulation; system buses; 0.18 micron; 20 Gbit/s; CMOS building blocks; CMOS process; LC ladder; NEXT cancellation; PAM signal transmission; backplane serial I/O interconnections; feedforward equalizer; four level pulse amplitude modulation; high speed data transmission; modified Gilbert cell multiplier; near-end crosstalk noise cancellation; system architecture; tunable active high pass filter; tunable filter elements; voltage headroom; Amplitude modulation; Backplanes; Crosstalk; Data communication; Filters; Impedance; Integrated circuit interconnections; Noise cancellation; Pulse modulation; Tunable circuits and devices;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2004.839311

Filename

1381695