Title :
Systematic approach for discrete-time to continuous-time transformation of ΣΔ modulators
Author :
Aboushady, Hassan ; Louërat, Marie-Minerve
Author_Institution :
LIP6/ASIM Lab., Paris VI Univ., France
Abstract :
In this paper, we propose a systematic design method for continuous-time sigma-delta modulators. The modified-Z-transform technique is used to take into account any variation occurring between two sampling instants in the continuous-time DAC feedback signal. The proposed discrete-time to continuous-time transformation method is general and well-suited to design automation. A fifth-order lowpass as well as a sixth order bandpass modulators with RZ and NRZ feedback signals are given as design examples.
Keywords :
Z transforms; circuit CAD; circuit feedback; continuous time systems; integrated circuit design; sigma-delta modulation; DAC feedback signal; NRZ feedback signals; RZ feedback signals; continuous-time sigma-delta modulators; design automation; discrete-time to continuous-time transformation; fifth-order lowpass modulators; modified-Z-transform technique; sampling instants; sixth order bandpass modulators; systematic design method; Convolution; Delta modulation; Design automation; Discrete transforms; Feedback loop; Laplace equations; Mathematics; Optical signal processing; Sampling methods; Switches;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010431
