A Low-Power Low-Voltage CMOS A/D Sigma-Delta Modulator for Bio-Potential Signals using a Single-Phase Scheme
João Goes,
UNINOVA –
Abstract:
A low-power and low-voltage Analogue-to-digital (A/D) interface module for biomedical applications is presented. This module provides an A/D conversion based on a mixed clock-bootstrapping/switched-opamp second-order sigma-delta (SD) modulator, capable of interfacing with several different types electrical signals existing in the human body, only by re-programming the digital filter at the output. The SD architecture employs a novel single-phase scheme technique, which improves the dynamic performance and highly reduces the clocking circuitry complexity, substrate noise and area. The circuit is integrated in a standard 0.18um CMOS technology and achieves 80dB SNDR and 83dB DR when operating with a nominal supply of 0.9V and dissipating only 0.2mW. The die area of the overall SD circuit is as small as 0.06mm2.
Date: 2006-Feb-01 Time: 14:00:00 Room: 336
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