STF behaviour in optimised for ELD cascaded CT Delta-Sigma Modulators

This paper looks at the Signal Transfer Function (STF) behaviour of cascaded Continuous-Time Delta-Sigma Modulators (CTDSMs) and how the flattening technique proposed by De Maeyer et al. can be used to reduce the effect of interfering signals and performance degradation for a subset of Excess Loop D...

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Bibliographic Details
Published in:	2012 IEEE International Symposium on Circuits and Systems (ISCAS) pp. 57 - 60
Main Authors:	Angus, A. C. R., Reekie, H. M.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-05-2012
Subjects:	Couplings Delay Frequency modulation Noise Noise shaping Optimization
Online Access:	Get full text
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Summary:	This paper looks at the Signal Transfer Function (STF) behaviour of cascaded Continuous-Time Delta-Sigma Modulators (CTDSMs) and how the flattening technique proposed by De Maeyer et al. can be used to reduce the effect of interfering signals and performance degradation for a subset of Excess Loop Delays (ELDs). Furthermore it will be shown that the noise-shaping performance of a CTDSM can be improved by optimising to take advantage of the ELD induced loop-filter order increase at the expense of the Anti-Alias Filter (AAF) response. Example cascades for two repeated second-order sections are presented which show that STF flattening and ELD optimisation offer improved performance over that of the undelayed system.
ISBN:	9781467302180 146730218X
ISSN:	0271-4302 2158-1525
DOI:	10.1109/ISCAS.2012.6272094