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BER-optimal analog-to-digital converters for communication links

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3 Author(s)
Minwei Lu ; Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA ; Shanbhag, N. ; Singer, A.

In this paper, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5dB for channels with low intersymbol interference (ISI) to more than 30dB for channels with high ISI. Moreover, a 3-bit BER-optimal ADC achieves the same or even lower BER than a 4-bit uniform ADC. For flash converters, this corresponds a power reduction by 2×. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the transmitter or decrease power consumption of the ADC.

Published in:

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Date of Conference:

May 30 2010-June 2 2010

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