Switched capacitor bandpass filter tuned by ring VCO in CMOS 0.35 /spl mu/m

Recently Switched-Capacitor filtering capabilities have grown to the Megahertz frequency range. This paper describes an original association of a switched capacitor (SC) bandpass filter and its command circuit made up by a ring voltage controlled oscillator (VCO) with "exclusive-or" (XOR)...

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Bibliographic Details
Main Authors: Paillot, J.-M., El Oualkadi, A., Guegnaud, H., Allam, R.
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
BiCMOS integrated circuits
Filtering
Frequency
Mobile handsets
Q factor
Switched capacitor circuits
Switching circuits
Tunable circuits and devices
Voltage-controlled oscillators
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Description
Summary:Recently Switched-Capacitor filtering capabilities have grown to the Megahertz frequency range. This paper describes an original association of a switched capacitor (SC) bandpass filter and its command circuit made up by a ring voltage controlled oscillator (VCO) with "exclusive-or" (XOR) gates. Implemented in a standard BiCMOS 0.35 /spl mu/m technology, this circuit is attended to be employed in a subset of mobile phone applications using the Tetrapol standard of EADS-TELECOM, which requires a frequency range between 380 and 520 MHz. The results presented for this first design are a tunable center frequency range equal to 220 MHz (320 MHz-540 MHz), with a quality factor greater than 300.
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2003.1213907