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Very low-voltage digital-audio ΔΣ modulator with 88-dB dynamic range using local switch bootstrapping

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2 Author(s)
Dessouky, M. ; Lab. d''Inf. de Paris 6, Paris VI Univ., France ; Kaiser, A.

A 1-V 1-mW 14-bit ΔΣ modulator in a standard CMOS 0.35-μm 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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Solid-State Circuits, IEEE Journal of  (Volume:36 ,  Issue: 3 )