MICROWAVE ACOUSTICS: ELECTROACOUSTIC AMPLIFICATION AND MICROWAVE SIGNAL PROCESSING.
Abstract
A review of sound wave amplification in ferroelectric semiconductors is given with a detailed calculation of coupling and gain constants for the material strontium titanate. Experiments were performed on a sample of strontium titanate using photo induced carriers, but no electrostrictive interaction was observed. It is concluded that strontium titanate has appropriate parameters for studying electrostrictive amplification, but that samples with higher carrier concentration than is presently available are required for meaningful experiments. A detailed study of acoustic amplification in GaAs over the frequency range 0.5 to 3 GHz is described. The experiments show that the gain obeys the well known linear theory for acoustic power densities below 1 watt/sq cm with relative electronic gains of about 100 dB/cm when operating well below saturation. An analysis of current and gain saturation effects is given and is compared with available theory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1968
- Accession Number
- AD0682980
Entities
People
- Calvin Quate
- D. Jefferies
- H. D. Adams
- K. K. Winslow
- M. Chodorow
Organizations
- Stanford University