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MOSFET-C filter with on-chip tuning and wide programming range
Osa, J.I.; Carlosena, A.; Lopez-Martin, A.J.;
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
Volume 48,
Issue 10,
Oct. 2001
Page(s):944
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951
Abstract:
This paper describes a complete system that includes a signal processing circuit, i.e., a bandpass audio filter, with its surrounding Q and fc tuning circuitry. The filter is not only tunable against fabrication tolerances or aging, but also programmable by the user in a wide range for both parameters. To achieve this goal, a novel phase-locked loop architecture has been designed and implemented. For the amplitude detection and control of both voltage-controlled oscillator and Q-tuning circuit, a novel scheme is also proposed. The complete system has been implemented on a 0.5-μm CMOS technology
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