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A fourth-order single-bit switched-capacitor Σ-Δ modulator for distributed sensor applications

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4 Author(s)
S. Brigati ; Acco Microclettromea S.r.l., Pavia, Italy ; F. Francesconi ; P. Malcovati ; F. Maloberti

In this paper, we present a switched-capacitor sigma-delta (Σ-Δ) modulator for high resolution applications. In particular, this Σ-Δ modulator is well suited for distributed sensor networks. The circuit, implemented in a double-poly, double-metal 0.6 μm CMOS technology, is based on a fourth-order single-loop architecture with a sampling frequency of 256 kHz. The chip consumes 50 mW from a single 5-V supply and achieves a signal-to-noise ratio of 104.9 dB over a bandwidth of 400 Hz, corresponding to a resolution of 17.1 bits.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:53 ,  Issue: 2 )