Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 36, Issue 3, Pages 349-355Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/4.910473
Keywords
analog circuits; bootstrapped switch; delta-sigma modulators; switched-capacitor circuits; very low voltage
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A 1-V 1-mW 14-bit Delta Sigma modulator in a standard CMOS 0.35-mum technology is presented. Special attention has been given to device reliability and power consumption in a switched-capacitor implementation. A locally bootstrapped symmetrical switch that avoids gate dielectric overstress is used in order to allow rail-to-rail signal switching, The switch constant overdrive also enhances considerably circuit linearity. Modulator coefficients of a single-loop third-order topology have been optimized for low power. Further reduction in the power consumption is obtained through a modified two-stage opamp, Measurement results show that for an oversampling ratio of 100, the modulator achieves a dynamic range of 88 dB, a peak signal-to-noise ratio of 87 dB and a peak signal-to-noise-plus-distortion ratio of 85 dB in a signal bandwidth of 25 kHz.
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