Super high frequency oscillator/resonator

Details Super high frequency oscillator/resonator Super high frequency oscillator/resonator

1990-01-03

1991-06-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310348, 310321, 333188, 333200, H01L 4108

Patent

active

050235036

ABSTRACT:
A method of filtering an AC signal using a piezoelectric beam is provided. A piezoelectric film is formed on a mechanical support and a portion of the piezoelectric film forms a beam which extends beyond the mechanical support so that a cavity is formed underneath the beam, and the beam is free to vibrate in the cavity at a resonant frequency when an acoustic wave is propagated in the piezoelectric layer.
A depletion region is formed under a Schottky contact which serves as a drive electrode. An unfiltered AC signal is coupled to the drive electrode thereby establishing an acoustic wave when the unfiltered AC signal comprises a component at the resonant frequency. Surface charge on the piezoelectric film resulting from vibration of the beam allows the resonant frequency component of the unfiltered AC signal to pass through the depletion region. Alternatively, the resonant frequency component can be passed by a tunnel current through the cavity.

REFERENCES:
patent: 4191905 (1980-03-01), Yasuda
patent: 4282454 (1981-08-01), Wakat et al.
patent: 4282498 (1981-08-01), Iizawa
patent: 4633124 (1986-12-01), Kawashima
patent: 4906840 (1990-03-01), Zdeblick

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