Multi-rate polyphase DSP and LMS calibration schemes for oversampled data conversion systems

Subhanshu Gupta, Yi Tang, Kuang-Wei Cheng, Jeyanandh Paramesh, David J. Allstot

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Architectural schemes for low-power calibration of oversampled analog-to-digital (A/D) systems are presented. Conventional full-rate least-mean squares (LMS) calibration has two well-known limitations: slow convergence and increased computational complexity/power dissipation for higher adaptive filter orders and sampling frequencies. Half-(fs/2) and quarter-rate (f s/4) LMS calibration for oversampled A/D decimators are used to reduce the computational complexity. Noble identities and polyphase decimation are used to implement these schemes to match digital noise-cancellation filters (NCF) to the corresponding transfer functions of an analog fourth-order cascade sigma-delta (ΣΔ) ADC. Energy savings up to 30% compared to conventional full-rate (fs) schemes are confirmed using an Altera Stratix II field-programmable gate array (FPGA). The analog front-end comprises a switched-capacitor 2-2 cascade ΣΔ ADC implemented in 0.13μm CMOS. Using differential-pair opamps with gains of only 22 db and an oversampling ratio OSR = 8, the ΣΔ ADC system achieves 11-bit accuracy over a 9.4 MHz bandwidth with SNR = 67 dB and SFDR = 75 dB.

Original languageEnglish
Title of host publication2011 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011 - Proceedings
Pages1585-1588
Number of pages4
DOIs
Publication statusPublished - 2011 Aug 18
Event36th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011 - Prague, Czech Republic
Duration: 2011 May 222011 May 27

Publication series

NameICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
ISSN (Print)1520-6149

Other

Other36th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011
CountryCzech Republic
CityPrague
Period11-05-2211-05-27

All Science Journal Classification (ASJC) codes

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

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