A novel RC time constant tuning technique utilizing programmable current sources for continuous-time delta-sigma modulators

Daisuke Kanemoto; Yu Tamura; Bogoda A. Indika U. K.; Toshimasa Matsuoka; Kenji Taniguchi

doi:10.1587/elex.9.572

LETTER

A novel RC time constant tuning technique utilizing programmable current sources for continuous-time delta-sigma modulators

Daisuke Kanemoto, Yu Tamura, Bogoda A. Indika U. K., Toshimasa Matsuoka, Kenji Taniguchi

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Keywords: continuous-time delta-sigma modulator, RC time constant tuning

JOURNAL FREE ACCESS

2012 Volume 9 Issue 6 Pages 572-579

DOI https://doi.org/10.1587/elex.9.572

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Abstract

A novel RC time constant tuning technique for continuous-time delta-sigma modulators is proposed to alleviate the systematic time constant shift originating from process variations. The proposed tuning technique uses programmable current sources instead of capacitor banks in order to reduce the implemented die area. MATLAB/Simulink simulation results demonstrate that this technique can achieve the desired SQNR even with ±30% RC time constant shifts.

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