Title :
The inconvenient truth about alias rejection in continuous time ΔΣ converters
Author_Institution :
Indian Inst. of Technol. - Madras, Chennai, India
Abstract :
Continuous-time Delta Sigma Modulators (CTDSM) have "Implicit Anti-Aliasing" is a commonly heard refrain in the data-converter design community. We show that this is not the case when a switched capacitor (SC) feedback DAC is used, thereby nullifying one of the principal advantages of continuous-time operation. We give an intuitive understanding of this phenomenon, and propose a power efficient circuit technique to improve alias rejection.
Keywords :
delta-sigma modulation; switched capacitor networks; alias rejection; continuous time ΔΣ converters; continuous-time delta sigma modulators; implicit anti-aliasing; switched capacitor feedback DAC; Capacitors; Clocks; Frequency modulation; Jitter; Switches; Thyristors;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937618
