DocumentCode :
1520684
Title :
On Continuous-Time 
Modulators With Return-to-Open DACs
Author :
Pavan, Shanthi
Author_Institution :
Indian Inst. of Technol., Chennai, India
Volume :
58
Issue :
5
fYear :
2011
fDate :
5/1/2011 12:00:00 AM
Firstpage :
284
Lastpage :
288
Abstract :
We examine the alias rejection of continuous-time ΔΣ modulators (CTDSMs) with return-to-open (RTO) feedback digital-to-analog converters (DACs). We show that using an RTO DAC can compromise the alias rejection of the CTDSM around odd multiples of the sampling rate. The intuition and theory behind this curious phenomenon are given. A circuit technique that mitigates this problem is proposed, and its efficacy is verified with simulations.
Keywords :
delta-sigma modulation; CTDSM; RTO feedback; continuous-time ΔΣ modulator; digital-to-analog converter; return-to-open DAC; Bandwidth; Capacitors; Frequency modulation; Noise; Switches; Transconductance; Alias rejection; CIFB; CIFF; DAC; continuous-time; data conversion signal transfer function (STF); modulator; noise transfer function (NTF); oversampling; return to open; return to zero; sigma delta;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2011.2124930
Filename :
5771064
Link To Document :
