Accession Number : AD0620854

Title :   ACTIVE ACOUSTIC DEVICES.

Descriptive Note : Quarterly rept. no. 3, Jan-31 Mar 65,

Corporate Author : MOTOROLA INC PHOENIX ARIZ SEMICONDUCTOR PRODUCTS DIV

Personal Author(s) : Sakiotis,N. G. ; Brendecke,W. H. ; Hickernell,F. S.

Report Date : AUG 1965

Pagination or Media Count : 78

Abstract : A heat sink design has been demonstrated which maintains the maximum crystal temperature rise to less than 10 C above ambient for a range of values of drift field power density required for useful continuous acoustic gain. The work on thin film transducers has yielded processes and techniques for the deposition of insulating CdS films on CdS substrates resulting in conversion losses in the range of 6-8 db and bandwidths of the order of 50% in the frequency of 100-300 mc/sec. Bonded quartz transducers operating in the first overtone mode at 180 mc/sec with conversion losses of less than 10 db were demonstrated. Acoustic amplifier utilizing CdS material was shown to operate satisfactorily at maximum crystal temperatures of at least 70 C. (Author)

Descriptors :   (*TRANSDUCERS, SEMICONDUCTOR DEVICES), (*ACOUSTIC EQUIPMENT, SEMICONDUCTOR DEVICES), (*SEMICONDUCTOR DEVICES, TRANSDUCERS), SEMICONDUCTING FILMS, CADMIUM COMPOUNDS, SULFIDES, PIEZOELECTRIC CRYSTALS, SOLID STATE PHYSICS, VAPOR PLATING, VACUUM, GAIN, BERYLLIUM COMPOUNDS, OXIDES, QUARTZ, VERY HIGH FREQUENCY, SURFACE PROPERTIES, AMPLIFIERS, THERMAL CONDUCTIVITY, ULTRASONIC PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE