IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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New command circuit design for tuning high-Q pseudo 8-path switched-capacitor filter
Ahmed El OualkadiJean-Marie PaillotHervé GuegnaudRachid AllamLucien Dascalescu
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2004 Volume 1 Issue 13 Pages 363-367

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Abstract

This paper describes a new association of a high-Q pseudo 8-path switched-capacitor (S-C) bandpass filter and its command circuit made up by a ring VCO with `XOR' gates. The proposed circuit presents the possibility of tuning over a radio-frequency (RF) broadband allowing to sweep different channels with a high quality factor. Designed with CMOS process (0.35µm, for instance), this circuit is intended to replace the surface acoustic wave (SAW) filters in modern wireless receivers. Measurements carried out on a circuit demonstrator show a tunable center frequency range of 200MHz [300-500MHz], with a quality factor higher than 300.

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© 2004 by The Institute of Electronics, Information and Communication Engineers
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