Title :
A 1.95 V, 0.34 mW 12-bit sigma-delta modulator stabilized by local feedback loops
Author :
Au, Stephen ; Leung, Bosco
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
The design of a low power, low voltage, 12-bit 8 kHz bandwidth ΣΔ modulator that achieves 0.34 mW power consumption at 1.95 V supply is described. The modulator employs a novel architecture in which a third-order modulator is stabilized by a local feedback loop around each integrator. Unlike multi-stage ΣΔ modulators, this architecture is very tolerant to the modest DC gain of low voltage opamps. The architecture, together with special circuit techniques, permits a low voltage switched capacitor implementation at 1.95 V-3.3 V supply using standard 1.2 μm CMOS technology
Keywords :
CMOS integrated circuits; circuit feedback; circuit stability; modulators; sigma-delta modulation; switched capacitor networks; ΣΔ modulator; 0.34 mW; 1.2 micron; 1.95 to 3.3 V; 12 bit; 8 kHz; CMOS technology; integrator; local feedback loops; low power design; low voltage SC implementation; low voltage opamps; low voltage operation; power consumption; sigma-delta modulator; third-order modulator; Bandwidth; CMOS technology; Delta-sigma modulation; Digital modulation; Energy consumption; Feedback loop; Frequency; Low voltage; Sampling methods; Switches;
Conference_Titel :
Custom Integrated Circuits Conference, 1996., Proceedings of the IEEE 1996
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3117-6
DOI :
10.1109/CICC.1996.510586
