Title :
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
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;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176703
