DocumentCode :
3852640
Title :
A Method for the Schmitt-Trigger Propagation-Delay Compensation in Asynchronous Sigma–Delta Modulator
Author :
Tomislav Matic;Tomislav ?vedek;Marijan Herceg
Author_Institution :
Department of Communications, Faculty of Electrical Engineering, Osijek , Croatia
Volume :
59
Issue :
7
fYear :
2012
Firstpage :
404
Lastpage :
408
Abstract :
This brief provides the mathematical analysis of the Schmitt-trigger propagation-delay influence on the asynchronous sigma-delta modulator (ASDM) output-signal frequency spectrum. Beside the propagation delay, the Schmitt-trigger slew-rate impact has been also presented. Based on the mathematical analysis, a method for the Schmitt-trigger propagation-delay compensation has been proposed. The method is implemented by introducing hysteresis-level modulation. The first-order ASDM simulation and measurement models have been proposed for the propagation-delay influence to the ASDM output-signal frequency and for the compensation method verification. The measurement and simulation results for the proposed method confirm the ASDM output frequency spectrum improvement.
Keywords :
"Propagation delay","Oscillators","Frequency modulation","Hysteresis","Frequency measurement","Delay"
Journal_Title :
IEEE Transactions on Circuits and Systems II: Express Briefs
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2012.2198981
Filename :
6205773
Link To Document :
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