IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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A delay-based complex double-sampled resonator for use in ƒs/4 quadrature bandpass ΣΔ modulators
Reekmans StijnRombouts PieterWeyten Ludo
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2007 Volume 4 Issue 6 Pages 192-198

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Abstract
This paper extends the circuit implementation of a complex ƒs/4 resonator based on integrators towards double-sampling. Next, an improved double-sampled circuit implementation of a complex ƒs/4 resonator based on delays is introduced. The key features of the proposed circuit are that mismatch does not affect the center frequency nor limit the Q-factor of the resonator and lower sensitivity towards opamp gain. To verify the analytical results extracted in this paper, simulation results are presented.
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© 2007 by The Institute of Electronics, Information and Communication Engineers
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