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A 900-mV low-power ΔΣ A/D converter with 77-dB dynamic range

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5 Author(s)
Peluso, V. ; ESAT-MICAS, Katholieke Univ., Leuven, Belgium ; Vancorenland, P. ; Marques, A.M. ; Steyaert, M.S.J.
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The design of a low-voltage and low-power ΔΣ analog-to-digital (A/D) converter is presented. A third-order single-loop ΔΣ modulator topology is implemented with the differential modified switched op-amp technique. The modulator topology has been transformed as to accommodate half-delay integrators. Dedicated low-voltage circuit building blocks, such as a class AB operational transconductance amplifier, a common-mode feedback amplifier, and a comparator are treated, as well as low-voltage design techniques. The influence of very low supply voltage on power consumption is discussed. Measurement results of the 900-mV ΔΣ A/D converter show a 77-dB dynamic range in a 16-kHz bandwidth and a 62-dB peak signal-to-noise ratio for a 40-μW power consumption

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Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 12 )