Study on Saturation Power in SAW Amplifiers
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.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- March 1977
- DOI:
- 10.1143/JJAP.16.413
- Bibcode:
- 1977JaJAP..16..413T
- Keywords:
-
- Power Gain;
- Surface Acoustic Wave Devices;
- Traveling Wave Amplifiers;
- Acoustic Propagation;
- Cadmium Sulfides;
- Current Distribution;
- Nonlinearity;
- Ohmic Dissipation;
- Saturation;
- Signal Analysis;
- Wave Amplification;
- Electronics and Electrical Engineering