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Analysis and Design of an Audio Continuous-Time 1-X FIR-MASH Delta-Sigma Modulator
, Billa S., Dixit S.
Published in Institute of Electrical and Electronics Engineers Inc.
Volume: 55
Issue: 10
Pages: 2649 - 2659
We combine a first-order single-bit CT Δ \!Σ \textM employing finite impulse-response (FIR) feedback with a 1-bit second-order Δ Σ back end to achieve a modulator with maximum stable amplitude (MSA) that is close to full scale, and a third-order overall noise transfer function (NTF). FIR feedback is used in the input stage to reduce clock-jitter sensitivity, improve linearity, and reduce chopping artifacts. We show that in a MASH ADC, FIR feedback has the additional benefit of filtering the error waveform of the first stage that is fed into the second stage. We apply the principle to an audio continuous-Time delta-sigma modulator. A prototype chip, fabricated in 180-nm CMOS to demonstrate the principle, achieves 100.9-dB SNDR in a 24-kHz bandwidth and dissipates 265 μ \textW. The resulting Schreier figure of merit is 180.5 dB. © 1966-2012 IEEE.
About the journal
JournalData powered by TypesetIEEE Journal of Solid-State Circuits
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open AccessNo