Active filter circuit

Details Active filter circuit Active filter circuit

H - Electricity

03

H

H03H 11/04 (2006.01) H03D 7/16 (2006.01)

Patent

CA 2069639

Abstract of the Disclosure A filter circuit disposed upon a single integrated circuit comprised of active filter elements including transconductance elements for a radiotelephone. The bandwidth of the passband of the filter is variable to pass alternately, signals of either a first bandwidth or a second bandwidth for passing, for example, signals generated in a conventional, cellular communication system, or a cellular communication system of increased capacity. Fine tuning of the bandwidth of the passband of the filter permits blocking of noise signals positioned, in frequency, proximate to a received, information signal.

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