Title :
Stability and design of continuous-time bandpass sigma delta modulators
Author :
van Engelen, J. ; van de Plassche, R.
Author_Institution :
Eindhoven Univ. of Technol., Netherlands
Abstract :
This paper describes a stability analysis for high-order single-bit sigma-delta modulators (SDM) and a design methodology for continuous-time SDM loop filters. Key to the stability analysis is the modeling of the phase uncertainty of the sampled quantizer. The design method is based on continuous-time filter structures having sufficient degrees of freedom. A 6th order bandpass SDM was designed: sampled at 40 MHz it achieves 67 dB SNDR in a 200 kHz bandwidth at 9.15 MHz
Keywords :
circuit stability; continuous time systems; integrated circuit design; sigma-delta modulation; 200 kHz; 40 MHz; 9.15 MHz; bandpass SDM; continuous-time bandpass sigma delta modulators; design methodology; phase uncertainty; stability analysis; Band pass filters; Delta modulation; Delta-sigma modulation; Design methodology; Feedback loop; Filtering theory; Frequency; Signal design; Stability analysis; Transfer functions;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780732
