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MULTI-RATE POLYPHASE DSP AND LMS CALIBRATION SCHEMES FOR OVERSAMPLED DATA CONVERSION SYSTEMS

Full Paper at IEEE Xplore

DSP Algorithm and Architecture Optimization for Hardware Implementation

Presented by: Subhanshu Gupta, Author(s): Subhanshu Gupta, University of Washington, United States; Yi Tang, Qualcomm Inc., Singapore; Kuang-Wei Cheng, Institute of Microelectronics, Singapore; Jeyanandh Paramesh, Carnegie Mellon University, United States; David Allstot, University of Washington, United States

Schemes for calibrating oversampled A/D systems are presented. Conventional full-rate LMS calibration has two limitations: slow convergence and high complexity/power dissipation for high adaptive filter orders and sampling frequencies. Half- (fs/2) and quarter-rate (fs/4) LMS calibration are used to reduce the complexity. Noble identities and polyphase decimation are used to match digital noise-cancellation filters to the transfer functions of an analog fourth-order cascade sigma-delta A/D. Energy savings up to 30% compared to conventional full-rate (fs) schemes are confirmed using an Altera Stratix II field-programmable gate array. Using OSR = 8, the A/D achieves 11-bit accuracy over a 9.4 MHz bandwidth with SNR = 67 dB and SFDR = 75 dB.

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Recorded: 2011-05-26 14:25 - 14:45, Club H
Added: 9. 6. 2011 23:30
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