Title :
A 1.95-V, 0.34-mW, 12-b sigma-delta modulator stabilized by local feedback loops
Author :
Au, Stephen ; Leung, Bosco H.
Author_Institution :
Maxim Integrated Products, Sunnyvale, CA, USA
fDate :
3/1/1997 12:00:00 AM
Abstract :
The design of a low-power, low-voltage, 12-b 8-kHz bandwidth ΣΔ modulator for high-quality voice that consumes only 0.34 mW at 1.95 V supply is described. The modulator employs a special architecture in which a third-order modulator is stabilized by a local feedback loop around each integrator. Unlike multistage ΣΔ modulators, this architecture is very tolerant to the modest dc gain of low voltage op-amps. 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; harmonic distortion; integrated circuit design; sigma-delta modulation; switched capacitor networks; 0.34 mW; 1.2 mum; 1.95 V; 8 kHz; CMOS technology; architecture; dc gain; design; high-quality voice; local feedback loop stabilization; low voltage op-amps; low-power low-voltage ΣΔ modulator; low-voltage switched capacitor implementation; oversampled A/D converter; sigma-delta modulator; third-order modulator; Bandwidth; CMOS technology; Delta-sigma modulation; Digital modulation; Energy consumption; Feedback loop; Frequency; Gold; Operational amplifiers; Sampling methods;
Journal_Title :
Solid-State Circuits, IEEE Journal of
