An Adaptive ELD Compensation Technique Using a Predictive Comparator

This brief presents an adaptive excess loop delay (ELD) compensation technique for continuous-time delta-sigma modulators. This technique utilizes a predictive comparator with adaptive control using the sign least-mean-square algorithm to estimate the compensation coefficients. Contrary to other sta...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2009-08, Vol.56 (8), p.619-623
Main Authors: El-Sankary, K., Alamdari, H.H., El-Masry, E.I.
Format: Article
Language:English
Subjects:
Adaptive control
Band pass filters
Bandwidth
Circuits
Comparators
Compensation
Computer simulation
Continuous time (CT)
Degradation
Delay
Delta modulation
Delta-Sigma Modulator (\Delta\Sigma\hbox{M})
Deterioration
excess loop delay (ELD)
least-mean-square (LMS) algorithm
Modulators
predictive comparator
Sampling methods
State of the art
Testing
Transfer functions
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Summary:This brief presents an adaptive excess loop delay (ELD) compensation technique for continuous-time delta-sigma modulators. This technique utilizes a predictive comparator with adaptive control using the sign least-mean-square algorithm to estimate the compensation coefficients. Contrary to other state-of-the-art compensation methods, the proposed technique is immune to manipulation of the loop filter transfer function and loop circuitry. Consequently, it will not deteriorate the performance of the modulators. Simulations performed on two different delta-sigma modulators show the effectiveness of the proposed technique to compensate the ELD in low-pass and bandpass delta-sigma modulators.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2009.2025620