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

Lu, Minwei

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https://hdl.handle.net/2142/16215 Copy

Description

Title

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

Author(s)

Lu, Minwei

Issue Date

2010-05-19T18:40:50Z

Director of Research (if dissertation) or Advisor (if thesis)

• Shanbhag, Naresh R.
• Singer, Andrew C.

Doctoral Committee Chair(s)

Shanbhag, Naresh R.

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• BER-optimal
• Analog-to-digital converters (ADC)
• communication links
• ADC shaping gain
• Bit-error rate (BER)

Abstract

In this thesis, 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. We define the ADC shaping gain metric in order to quantify the improvements. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5 dB for channels with low intersymbol interference (ISI) to more than 30 dB for channels with high ISI. Moreover, a 3 bit BER-optimal ADC achieves at least as low a BER as a 4 bit uniform ADC. For flash converters, this corresponds to a power reduction by 2x. 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 45 nm 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.

Graduation Semester

2010-5

Permalink

http://hdl.handle.net/2142/16215

Copyright and License Information

Copyright 2010 Minwei Lu

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