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

Volume

1

fYear

1997

fDate

9-12 Jun 1997

Firstpage

69

Abstract

This paper presents a 3rd order switched current-ΣΔ-modulator. The ΣΔ-modulator operates at a sampling rate of f_s=600 kHz and the signal band is f_b=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 V_DD=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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on

Print_ISBN

0-7803-3583-X

Type

conf

DOI

10.1109/ISCAS.1997.608533

Filename

608533