Minimum input sensitivity of high-order multi-stage sigma–delta modulator with first-order front-end
Ong, C. K.
Ng, L. S.
Date of Issue2000
School of Electrical and Electronic Engineering
Employing multi-stage sigma–delta modulators has provided an effective means of eliminating stability problems while achieving highresolution analog-to-digital conversion. However, component matching has become more stringent than a single-stage modulator. Mismatches cause loss in the modulators signal-to-noise ratio (SNR), but to a certain class of multi- stage modulators, discontinuity is also apparent in its SNR characteristics. This class of modulators employs a first-order modulator in its first stage. The discontinuity is caused by the nonlinearity of a first-order modulator’s noise, which is related to the minimum input requirement for the first-order modulator. This brief includes the formulation of the firstorder modulator’s minimum amplitude, nonlinear characteristics, and its effect on multi-stage modulators.
DRNTU::Engineering::Electrical and electronic engineering
IEEE transactions on circuits and systems-II : analog and digital signal processing
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