A Dynamic Dither Gain Control Technique for Multi-Level Delta-Sigma DACs with Multi-Stage Second Order Dynamic Element Matching

A dynamic dither gain control technique for multi-level delta-sigma Digital-to-Analog Converters (DACs) using multi-stage Dynamic Element Matching (DEM) with a second order loop filter is proposed. The proposed technique provides improvement on the mismatch shaping performance through dynamic contro...

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Veröffentlicht in:IEICE Transactions on Electronics 2011/03/01, Vol.E94.C(3), pp.346-352
Hauptverfasser: TAMURA, Yu, IDO, Toru, TANIGUCHI, Kenji
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container_title IEICE Transactions on Electronics
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creator TAMURA, Yu
IDO, Toru
TANIGUCHI, Kenji
description A dynamic dither gain control technique for multi-level delta-sigma Digital-to-Analog Converters (DACs) using multi-stage Dynamic Element Matching (DEM) with a second order loop filter is proposed. The proposed technique provides improvement on the mismatch shaping performance through dynamic control of delta-sigma modulator dither gain. A large dither gain, which suppresses DEM operation dependency on input signal, is applied to delta-sigma modulator, when DEM loop filter output is greater than a designed reference. The design example using the proposed technique on a third order 17-level delta-sigma modulator with 3-stage cascaded DEM is shown in this paper. Simulation result with 1% analog segment mismatch shows over 10dB improvement of THD+N performance under -50dB amplitude input signal, compared to the case without the proposed technique.
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subjects Applied sciences
Circuit properties
delta-sigma digital-to-analog converter
Discrete element method
dither control
Dithers
Dynamic control
dynamic element matching
Dynamics
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Gain
Matching
Modulators
Segments
Signal convertors
title A Dynamic Dither Gain Control Technique for Multi-Level Delta-Sigma DACs with Multi-Stage Second Order Dynamic Element Matching
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