MODELING BAND-PASS SIGMA-DELTA MODULATORS IN SIMULINK

S. Brigati, F. Francesconi, P. Malcovati, F. Maloberti

Abstract

In this paper we present a complete set of behavioral SIMULINK models for the simulation of switched-capacitor band-pass sigma-delta (BP&Sigma;&Delta;) modulators. The models include most of the non-idealities which affect the performance of these circuits, such as sampling jitter, <i>kT</i>/<i>C</i> noise and operational amplifier parameters (noise, finite gain, finite bandwidth, slew-rate and saturation voltages). With the proposed models it is possible to accurately predict with fast simulations the signal-to-noise and distortion ratio and the linearity of any BP&Sigma;&Delta; modulator.

Keywords

sigma-delta modulators, A/D converter modeling, behavioral modeling

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IMEKO-WC-2000-EWADC-P609.pdf

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