New high-Q discrete-time LC bandpass filter design with center frequency broadband tuning

Abstract : Discrete-time switched-capacitor filters have been in wide-spread used for a few years, for the realization of stable, accurate and high quality filters. This paper describes the design of a new 8-path pseudo switched capacitor LC bandpass filter and its command circuit made up by a ring voltage controlled oscillator (VCO) with 'XOR' gates. The proposed architecture presents the possibility of tuning over a frequency broadband allowing to sweep different channels with a high quality factor. This circuit is intended to replace the surface acoustic wave (SAW) filters in broadband wireless applications. Experimental results carried out on a prototype show quality factors up to 200, and a tunable center frequency range of 300 MHz [250-550 MHz].
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Analog Integrated Circuits and Signal Processing, Springer Verlag, 2006, 48 (2), pp.151-157. 〈10.1007/s10470-006-7228-4〉
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Ahmed El Oualkadi, Jean-Marie Paillot, Rachid Allam. New high-Q discrete-time LC bandpass filter design with center frequency broadband tuning. Analog Integrated Circuits and Signal Processing, Springer Verlag, 2006, 48 (2), pp.151-157. 〈10.1007/s10470-006-7228-4〉. 〈hal-00947403〉

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