Title :
A 0.2 mW CMOS /spl Sigma//spl Delta/ modulator for speech coding with 80 dB dynamic range
Author :
van der Zwan, E.J. ; Dijkmans, E.C.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
Abstract :
This /spl Sigma//spl Delta/ modulator design explores the limits of both the supply voltage and the current consumption of such a modulator in relation to its performance. The modulator is intended for use in portable telephones. The signal bandwidth is 300-3400 Hz. Its input is directly connected to the microphone (max. 40 mVrms). With the intended signal-to-noise ratio of 80 dB this means that the input-referred noise level should not exceed 4 /spl mu/Vrms.
Keywords :
CMOS integrated circuits; sigma-delta modulation; speech coding; 0.2 mW; 300 to 3400 Hz; CMOS /spl Sigma//spl Delta/ modulator; current consumption; dynamic range; input-referred noise level; portable telephone; signal bandwidth; signal-to-noise ratio; speech coding; supply voltage; 1f noise; Bandwidth; Circuit noise; Delta modulation; Dynamic range; Filters; Modulation coding; Noise shaping; Speech coding; Transconductors;
Conference_Titel :
Solid-State Circuits Conference, 1996. Digest of Technical Papers. 42nd ISSCC., 1996 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3136-2
DOI :
10.1109/ISSCC.1996.488584
