New structure of oversampling converters [delta-sigma modulator]

Author

Shieu, Yie-Yuan ; Wu, Chung-Yu ; Yu, Tsai-Chung ; Lin, Tung-Kwan ; Huang, Gwo-Sheng ; Chang, Shin-Shi

Author_Institution

Ind. Technol. Tes. Inst., Taiwan

fYear

1991

fDate

11-14 Jun 1991

Firstpage

1649

Abstract

A novel structure of delta-sigma modulator (DSM) is proposed where a two-stage second-order loop is modified to a third-order loop by using a differentiator. The structure is simple and is shown to achieve 16-bit performance for Hi-Fi audio-band applications when the sample rate is 3 MHz. For the applications in A/D, the sample rate for this structure is two times of that for the double-loop DSM. For the application in D/A, 17-bit resolution is obtained by sending the output of the differentiator back to the first stage comparator. The circuit implementation of the structure and its nonideal effect have been verified by computer simulation

Keywords

Hi-Fi equipment; analogue-digital conversion; delta modulation; differentiating circuits; digital-analogue conversion; modulators; switched capacitor networks; 16-bit performance; 17-bit resolution; A/D converter; D/A converter; Hi-Fi audio-band applications; computer simulation; delta-sigma modulator; differentiator; first stage comparator; oversampling converters; sample rate; switched capacitor implementation; third-order loop; two-stage second-order loop; Bandwidth; Circuits; Delta modulation; Dynamic range; Industrial electronics; Multi-stage noise shaping; Noise shaping; Quantization; Sampling methods; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991., IEEE International Sympoisum on

Print_ISBN

0-7803-0050-5

Type

conf

DOI

10.1109/ISCAS.1991.176703

Filename

176703