A new optimization technique for coefficient scaling in sigma-delta modulators

This article proposes a new method for scaling the output swing of the integrators in a sigma-delta modulator. The algorithm takes in consideration the relative effect on the output signal-to-noise ratio of the thermal noise from each integrator to find a set of coefficients which implements the des...

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Bibliographic Details
Published in2010 53rd IEEE International Midwest Symposium on Circuits and Systems pp. 312 - 315
Main Authors Collard-Fréchette, E, Gagnon, G
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2010
Subjects
Circuit noise
Delta-sigma modulation
Noise reduction
Noise shaping
Operational amplifiers
Phase noise
Signal to noise ratio
Switched capacitor circuits
Transfer functions
Voltage
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Summary:This article proposes a new method for scaling the output swing of the integrators in a sigma-delta modulator. The algorithm takes in consideration the relative effect on the output signal-to-noise ratio of the thermal noise from each integrator to find a set of coefficients which implements the desired transfer functions while reducing the signal swing at each node. Simulation results show that the last two integrators output swing can be reduced by 50% and 90% respectively for a 0.5 dB signal-to-noise ratio reduction.
ISBN:1424477719
9781424477715
ISSN:1548-3746
1558-3899
DOI:10.1109/MWSCAS.2010.5548820