Abstract
This paper has proved, by using Weinreich relation, that a carrier depletion effect is a main cause for power saturation phenomena in the acoustic bulk-wave (BAW) amplifiers formerly reported. By using this proof, a standard of the saturation power in several kinds of acoustic surface-wave (SAW) amplifiers is derived in a general form, and it is indicated that monolithic SAW amplifiers are better suited for obtaining high saturation power than compound-medium ones. The large signal amplification characteristics of the monolithic SAW amplifier are studied theoretically by using a simple analytical nonlinear theory as well as computer calculations and also experimentally by using CdS SAW amplifiers. Finally, it is proposed that the acoustic wave amplifier could have a higher saturation power under constant current drive than under constant field drive.
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