Abstract
A low-voltage low-power Sigma-Delta modulator for health monitoring system is designed using a standard 0.18[Formula: see text][Formula: see text]m 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 86[Formula: see text]dB dynamic range (DR) over a 300[Formula: see text]Hz bandwidth with an oversampling ratio (OSR) of 128, while it occupies 0.16[Formula: see text]mm2 and consumes 12[Formula: see text][Formula: see text]W under a 1.1[Formula: see text]V supply.
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