An 8 Gb/s Far-End Crosstalk Cancelation and FFE Co-Designed TX Output Driver

Abstract

This letter describes a single-ended transmitter (TX) output driver, which combines a feed-forward equalizer (FFE) and a far-end crosstalk (FEXT) canceller. The proposed output driver reduces the crosstalk-induced jitter (CIJ) between the two parallel coupled microstrip lines while preserving the inherent high-frequency boosting signal for the channel loss compensation. A prototype operating at a supply voltage of 0.9 V was fabricated in a 28-nm CMOS technology, occupying an area of $0.025~{\text {mm}^{2}}$ . This prototype reduces the peak-to-peak jitter and CIJ by 48% (29 ps) and 114%, respectively, at 8 Gb/s. Furthermore, it increases the horizontal eye-opening (BER < 1E-12) by 34%, with an energy efficiency of 1.08 pJ/bit/channel.