Title :
A 0.25 mW sigma-delta modulator for voice-band applications
Author_Institution :
Integrated Syst. Labs., Texas Instrum. Inc., Dallas, TX, USA
Abstract :
A very low power and high resolution analog to digital converter has been developed for voice-band applications. It employs a third-order cascaded sigma-delta modulator and operates with supply range from 2 V to 5 V. When this modulator is used at an oversampling ratio (OSR) of 64 and clock frequency of 500 kHz, it achieves 81.5 dB dynamic range and 77 dB peak signal-to-noise plus distortion ratio (SNDR). The power required for this performance is only 0.25 mW at 2 V power-supply voltage.
Keywords :
cascade networks; sigma-delta modulation; speech processing; 0.25 mW; 2 to 5 V; 500 kHz; clock frequency; dynamic range; low power high resolution analog to digital converter; oversampling ratio; signal-to-noise plus distortion ratio; third-order cascaded sigma-delta modulator; voice-band applications; Bandwidth; Capacitors; Circuits; Degradation; Delta-sigma modulation; Frequency; Noise shaping; Power supplies; Quantization; Voltage;
Conference_Titel :
VLSI Circuits, 1995. Digest of Technical Papers., 1995 Symposium on
Conference_Location :
Kyoto, Japan
Print_ISBN :
0-7800-2599-0
DOI :
10.1109/VLSIC.1995.520676
