A 1.1V 12W 86dB DR Sigma-Delta Modulator for Health Monitoring System.

A low-voltage low-power Sigma-Delta modulator for health monitoring system is designed using a standard 0.18m CMOS technology. To achieve high accuracy with low power consumption in low supply voltage environment, the designed modulator is implemented with a one-bit third-order topology, in which the input-feedforward structure and switched-opamp (SO) technique are combined. Using the proposed design method, the SO meets the system requirements with the minimal power consumption and good stability in a feedback loop. The modulator achieves 86dB dynamic range (DR) over a 300Hz bandwidth with an oversampling ratio (OSR) of 128, while it occupies 0.16mm² and consumes 12W under a 1.1V supply. [ABSTRACT FROM AUTHOR]