Title :
Oversampling analog/digital converters with finite zeros in noise shaping functions
Author_Institution :
Dept. of Electr. & Electron Eng., Melbourne Univ., Parkville, Vic., Australia
Abstract :
A double-input oversampling modulator (DIOM) is proposed for analog-digital converter design. The main property of the method is that it allows arbitrary noise shaping functions, provided that stability is assumed. Finite zeros can be introduced. For bandpass type input signal a DIOM can be designed with a much lower sampling rate than a sigma-delta modulator. The requirement on op amp settling time can thus be greatly reduced. Sensitivity behavior of DIOMs is discussed and a multistage design example is provided
Keywords :
analogue-digital conversion; modulators; network synthesis; poles and zeros; sensitivity analysis; switched capacitor networks; analog-digital converter design; bandpass type input signal; double-input oversampling modulator; finite zeros; multistage design; noise shaping functions; op amp settling time; sampling rate; sensitivity behaviour; stability; switched capacitor circuit; Analog-digital conversion; Circuit noise; Digital circuits; Feedback; Filtering theory; Interference elimination; Noise shaping; Polynomials; Quantization; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176702
