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A 94dB SFDR 78dB DR 2.2MHz BW Multi-bit Delta-Sigma Modulator with Noise Shaping DAC

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2 Author(s)
Jianzhong Chen ; Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Dr 3, Singapore 117576, ; Yong Ping Xu

A 5th - order multi-bit lowpass delta-sigma modulator employs a proposed noise shaping dynamic element matching (NSDEM) technique to remove DAC non-linearity error. Unlike most existing DEMs trading SNR for SFDR, the proposed technique improves both SFDR and SNR The noise shaping is incorporated in the first integrator of the loop filter without any additional analog circuitry. The fabricated modulator chip achieves 94dB SFDR and 78dB DR in 2.2 MHz BW and meets the ADSL2+ specifications.

Published in:

2007 IEEE Custom Integrated Circuits Conference

Date of Conference:

16-19 Sept. 2007