Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-01-26
1977-05-03
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 82, 310 98, 330174, H03H 904, H03H 926, H03H 932, H03F 1300
Patent
active
040217612
ABSTRACT:
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 output transducer comprised of a set of similar interleaved electrodes 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 corresponding output signal having a selected frequency response. The frequency response (e.g., bandwidth) of the acoustic surface-wave filter device is controlled by selectively changing the number of conductor elements constituting the interleaved electrodes 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 compensate for corresponding changes in the insertion loss and input impedance of the filter device.
REFERENCES:
patent: 2400857 (1946-05-01), Turner
patent: 3446974 (1969-05-01), Seiwatz
patent: 3621482 (1971-11-01), Adler
patent: 3745564 (1973-07-01), Gandolfo et al.
patent: 3831116 (1974-08-01), Davis, Jr. et al.
patent: 3942135 (1976-03-01), Moor et al.
White et al.--"Direct Piezoelectric Coupling to Surface Elastic Waves" in Applied Physic Letters, 15 Dec. 1965; pp. 314-316.
Morii Kokichi
Urayama Ken-Ichi
Eslinger Lewis H.
Nussbaum Marvin
Sinderbrand Alvin
Smith Alfred E.
Sony Corporation
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