An area-power efficient CMOS 4-PAM class AB current-mode pre-emphasis serial link transmitter

Authors:
Fei Yuan;Minghai Li
Affiliations:
Department of Electrical and Computer Engineering, Ryerson University, Toronto, Canada M5B 2K3;Department of Electrical and Computer Engineering, Ryerson University, Toronto, Canada M5B 2K3 and Micron Technology Inc., Boise, USA
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2007

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Abstract

This paper presents an area-power efficient CMOS 4-PAM class AB current-mode pre-emphasis transmitter for multi-Gb/s serial links. The proposed transmitter minimizes both chip area and power consumption by constructing pre-emphasis symbols directly from the current symbol, eliminating the need for complex FIR filters and digital-to-analog converters. The differential output current obtained from a class AB pre-amplifier and the push-pull operation of both the current-symbol and pre-emphasis drivers minimizes the electromagnetic interference exerted by channels to neighboring devices. The use of latches at both the multiplexer and pre-amplifier minimizes the effect of power fluctuation and ground bouncing on the output current of the transmitter. The proposed transmitter has been implemented in both UMC-0.13 μm 1.2 V and TSMC-0.18 μm 1.8V CMOS technologies and analyzed using SpectreRF from Cadence Design Systems with BSIM3.3v device models. The effectiveness of the proposed transmitter architecture is validated from the simulation results of both designs.