Programmable monolithic Gm-C band-pass filter: design and experimental results

Authors:
Eric Lebel;Ali Assi;Mohamad Sawan
Affiliations:
Polystim Neurotechnologies Laboratory, Department of Electrical Engineering, Ecole Polytechnique de Montréal, Quebec, Canada;Polystim Neurotechnologies Laboratory, Department of Electrical Engineering, Ecole Polytechnique de Montréal, Quebec, Canada and Department of Electrical Engineering, United Arab Emirates Uni ...;Polystim Neurotechnologies Laboratory, Department of Electrical Engineering, Ecole Polytechnique de Montréal, Quebec, Canada
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2008

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Abstract

We propose in this paper a programmable band-pass filter based on an array of fully differential transconductance circuits that controls the filter parameters. The signal path does not contain any switch, and fine-tuning of the filter parameters is implemented using programmable capacitors. A digital building block is implemented in the proposed band-pass filter to tune its central frequency as well as its bandwidth. The filter circuit is based on a biquad topology, which is designed and implemented with CMOS 0.18 μm technology. Experimental results show a programming ability of the center frequency between 5.9 and 58 MHz, and the quality factor can be tuned from 0.36 to 10. These features are obtained for a total power consumption of less than 10.5 mW from a single 1.8 V power supply.