Title :
Influence of the feedback DAC delay on a continuous-time bandpass ΔΣ converter
Author :
Yahia, Abdeljalil ; Benabes, Philippe ; Kielbasa, Richard
Author_Institution :
Ecole Superieure d´´Electr., Gif-sur-Yvette, France
Abstract :
Analysis of the influence of the DAC+ADC delay on the synthesis results of continuous-time ΔΣ bandpass modulators is presented and detailed. This analysis method, based on a previously presented method uses a discrete time simulator, which is more efficient than an analog one. It will be shown that non-zero values of the feedback DAC delay can improve the filter gain margin. In this analysis the gain margin sensitivity to the real loop delay is also presented.
Keywords :
circuit feedback; continuous time systems; delays; delta-sigma modulation; ADC delay; continuous-time bandpass delta-sigma modulator; discrete time simulation; feedback DAC delay; filter gain margin; loop delay; Analog-digital conversion; Analytical models; Band pass filters; Capacitors; Circuit simulation; Delay effects; Design methodology; Feedback; Frequency; Sampling methods;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1011436
