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Systematic design of continuous-time ΣΔ modulator with VCO-based quantizer

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5 Author(s)
Wagdy M. Gaber ; University Pierre & Marie Curie, Paris VI, LIP6 Laboratory, France ; Mootaz Allam ; Hassan Aboushady ; Marie-Minerve Louerat
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A methodology for the design of Continuous-Time (CT) Sigma-Delta (ΣΔ) modulators with VCO-based quantizer is proposed. The coefficients of the CT ΣΔ modulator are accurately calculated such that the noise transfer function of the modulator is exactly the same as a Discrete-Time (DT) ΣΔ modulator of the same order. The proposed design method takes into account loop-delay compensation as well as the shape of the feedback Digital-to-Analog Converter (DAC) signal. VCO non-idealities such as non-linear Kvco and phase noise are studied. Several design examples for different modulator orders and feedback DAC signal shapes are given to validate the proposed methodology.

Published in:

Proceedings of 2010 IEEE International Symposium on Circuits and Systems

Date of Conference:

May 30 2010-June 2 2010