Accession Number : AD0822203

Title :   DEVELOPMENT OF A 1 KW, 1 KV AUDIO TRANSISTOR AND DRIVER TRANSISTOR FOR SONAR APPLICATIONS.

Descriptive Note : Interim engineering rept. no. 2, 16 May-16 Aug 67.

Corporate Author : RADIO CORP OF AMERICA SOMERVILLE NJ ELECTRONIC COMPONENTS AND DEVICES

Report Date : 15 OCT 1967

Pagination or Media Count : 29

Abstract : Efforts were continued on a program to develop and fabricate an audio output power transistor and a suitable driver power transistor for sonar applications. Problems encountered in the epitaxial refill of the emitter-base overlay wafer are discussed in detail. Experiments on the glassing of high-voltage collector junctions are described which show that the problem of degradation of voltage in glassing is due to positive charge formation in the oxide-silicon nitride system. Significant improvement in breakdown voltage after glassing was realized by eliminating the thermal oxide and depositing silicon nitride directly on the base junction. Collector voltages as high as 1400 volts were observed on glassed transistors. A method of diffusing the collector contact region is also described. The characteristics of driver transistors fabricated during this interval are given and the test conditions described. These devices had a BV sub CEO (sus) greater than 400 volts.

Descriptors :   (*TRANSISTORS, AUDIO FREQUENCY), SONAR EQUIPMENT, EPITAXIAL GROWTH, ELECTRODES, GLASS, COATINGS, SILICON COMPOUNDS, NITRIDES, ETCHING, FAILURE(ELECTRONICS), OXIDES, POWER AMPLIFIERS, THERMAL PROPERTIES, ELECTRICAL RESISTANCE.

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE