Title :
A fourth-order single-bit switched-capacitor Σ-Δ modulator for distributed sensor applications
Author :
Brigati, Simona ; Francesconi, Fabrizio ; Malcovati, Piero ; Maloberti, Franco
Author_Institution :
Acco Microclettromea S.r.l., Pavia, Italy
fDate :
4/1/2004 12:00:00 AM
Abstract :
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.
Keywords :
CMOS integrated circuits; distributed sensors; sigma-delta modulation; switched capacitor networks; 0.6 μm CMOS technology; 0.6 micron; 256 kHz; 400 Hz; 5 V; 50 mW; CMOS integrated circuits; Detectors; distributed sensor applications; distributed sensor networks; double-metal; double-poly; fourth-order single-bit switched-capacitor; fourth-order single-loop architecture; intelligent sensors; measurement system data handling; sigma-delta modulation; sigma-delta modulator; signal-to-noise ratio; switched capacitor circuits; Bandwidth; CMOS technology; Circuits; Delta modulation; Detectors; Frequency; Petroleum; Sampling methods; Signal resolution; Signal to noise ratio;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2003.822480
