Title :
A 900-mV low-power ΔΣ A/D converter with 77-dB dynamic range
Author :
Peluso, Vincenzo ; Vancorenland, Peter ; Marques, Augusto M. ; Steyaert, S.J. ; Sansen, Willy
Author_Institution :
ESAT-MICAS, Katholieke Univ., Leuven, Belgium
fDate :
12/1/1998 12:00:00 AM
Abstract :
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
Keywords :
comparators (circuits); feedback amplifiers; low-power electronics; operational amplifiers; sigma-delta modulation; switched capacitor networks; ΔΣ modulator; 16 kHz; 40 muW; 900 mV; bandwidth; class AB operational transconductance amplifier; common mode feedback amplifier; comparator; dynamic range; half-delay integrator; low power A/D converter; low voltage design; power consumption; signal-to-noise ratio; switched opamp circuit; Analog-digital conversion; Circuit topology; Delta modulation; Energy consumption; Feedback amplifiers; Feedback circuits; Low voltage; Operational amplifiers; Power supplies; Transconductance;
Journal_Title :
Solid-State Circuits, IEEE Journal of
