Carrier concentration controlled surface acoustic wave variable

Details Carrier concentration controlled surface acoustic wave variable Carrier concentration controlled surface acoustic wave variable

1979-02-12

1980-11-11

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Significant distributed parameter resonator

310313R, 310366, 333152, 333195, H01L 4104, H03B 532, H03H 925, H03H 942

Patent

active

042335736

ABSTRACT:
An electrically controlled surface acoustic wave (SAW) delay unit includes a piezoelectric and semiconductive substrate having a segmented rectifying contact disposed on the surface of an interaction region between launching and detecting transducers, with a controllable voltage applied to the rectifying contact, thereby to vary the concentration of carriers in the semiconductive material, so as to commensurately alter the velocity of surface acoustic waves in the module. The segmented contact provides significant increase in the achievable variation in velocity, and therefore in phase as well. An oscillator configuration includes such a module with an amplifier and other circuit elements formed integrally therewith in a monolithic fashion. Exemplary embodiments include depleting the carrier concentration of semiconductive material, both piezoelectric material and nonpiezoelectric material having a piezoelectric surface layer thereon, as well as enhancement of carrier concentration of semiconductive material at the interface with a piezoelectric surface layer thereon. Various adjunctive design and fabrication techniques are also disclosed.

REFERENCES:
patent: 3710465 (1973-01-01), Thomann
patent: 3894286 (1975-07-01), Armstrong
patent: 4005376 (1977-01-01), Davis
patent: 4078186 (1978-03-01), Folen et al.

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