Biasing technique for high dynamic range, low oversampling ratio continuous-time [Sigma][Delta] modulators without calibration

An accurate, continuous-time, active IC filter based on G^sub m^-C integrators dedicated to the design of high dynamic range, low-oversampling ratio (OSR) continuous-time (CT) sigma-delta (ΣΔ) modulators is presented. Despite temperature and process variations, the biasing technique used enables des...

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Bibliographic Details
Published inElectronics letters Vol. 39; no. 25; p. 1
Main Authors Guillou, Y Le, Marie, H, Gamand, P, Descamps, P
Format Journal Article
LanguageEnglish
Published Stevenage John Wiley & Sons, Inc 11.12.2003
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Summary:An accurate, continuous-time, active IC filter based on G^sub m^-C integrators dedicated to the design of high dynamic range, low-oversampling ratio (OSR) continuous-time (CT) sigma-delta (ΣΔ) modulators is presented. Despite temperature and process variations, the biasing technique used enables design of a constant G^sub m^-C cell without additional tuning circuit. A zero-IF (ZIF) receiver has been designed integrating I (in-phase) and Q (quadrature-phase) ΣΔ modulators. The measured peak SNR for a single modulator is 82.5 dB in temperature range [-30°C, +85°C]. Its power consumption, including I and Q modulators, biasing circuitry and delay-locked loop is 7.25 mW under 2.5 V.
ISSN:0013-5194
1350-911X