Title :
A 3rd order low power SI ΣΔ-A/D converter for voice-band applications
Author :
Jorgensen, Ivan H. H. ; Bogason, Gudmundur
Author_Institution :
Dept. of Inf. Technol., Tech. Univ. Denmark, Lyngby, Denmark
Abstract :
This paper presents a 3rd order switched current-ΣΔ-modulator. The ΣΔ-modulator operates at a sampling rate of fs=600 kHz and the signal band is fb=5.5 kHz, i.e., an oversampling factor of R=54.5 is used. Multiple input signals are used to reduce the internal signal swings which results in reduced power consumption. The shaping of the noise from the 2nd and 3rd integrator is used to allow the noise power from these integrators to be increased to further save power. The total power consumption is approximately 2.5 mW with a supply voltage of VDD =3.3 V. The maximum SNR is approximately 74.5 dB
Keywords :
CMOS integrated circuits; sigma-delta modulation; switched current circuits; voice communication; 2.5 mW; 3.3 V; 5.5 kHz; 600 kHz; 74.5 dB; integrator; low power SI ΣΔ-A/D converter; noise shaping; sigma-delta ADC; switched current ΣΔ modulator; third-order A/D converter; voice-band applications; Data conversion; Energy consumption; Filters; Information technology; Multi-stage noise shaping; Noise shaping; Quantization; Sampling methods; Signal to noise ratio; Voltage;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608533
