Filter circuit having an acoustic surface-wave filter device

Details Filter circuit having an acoustic surface-wave filter device Filter circuit having an acoustic surface-wave filter device

H - Electricity

03

H

333/50

H03H 7/01 (2006.01) H03H 9/00 (2006.01) H03H 9/64 (2006.01)

Patent

CA 1039818

FILTER CIRCUIT HAVING AN ACOUSTIC SURFACE-WAVE FILTER DEVICE ABSTRACT OF THE DISCLOSURE A filter circuit includes an acoustic surface-wave filter device having an input transducer comprised of a set of, interleaved electrodes disposed on a first portion of a body of piezo-electric material adapted to propagate acoustic surface waves for producing an acoustic surface-wave signal in response to an input signal applied to the input transducer, and an out- put transducer comprised of a set of similar interleaved elec- trodes disposed on a second portion of the piezo-electric body spaced a selected distance from the first portion for receiving the acoustic surface-wave signals so as to produce a correspond- ing output signal having a selected frequency response. The frequency response (e.g., bandwidth) of the acoustic surface- water filter device is controlled by selectively changing the number of conductor elements constituting the interleaved elec- trodes of the input and output transducers. An amplifier drives the acoustic surface-wave filter device, the gain and output impedance of the amplifier being changed as the frequency response of the acoustic surface-wave filter device changes, so as to com- pensate for corresponding changes in the insertion loss and input impedance of the filter device. - 1 -

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