Accession Number : AD0864906

Title :   Suppression in Active Devices-Circuits.

Descriptive Note : Interim technical rept. (Annual), 1 Nov 68-31 Oct 69,

Corporate Author : CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING

Personal Author(s) : Ballantyne, J. M.

Report Date : DEC 1969

Pagination or Media Count : 115

Abstract : The aim of this project is to study the spurious emissions from transit-time Gunn diodes which affect the electromagnetic compatibility of these devices. Harmonic emission far from the fundamental and noise emission in the vicinity of the fundamental have been studied. Efforts on the harmonic program this year were directed toward the isolation and elimination of extraneous reflections and interferences in the far infrared interferometer. Noise from Gunn effect oscillators has been extensively measured. A major contribution to the noise spectrum is upconverted flicker noise present in the diode current. An analytic treatment of this up-conversion process is given. Good agreement is found between measured and calculated spectra. From a single noise measurement performed on a sample in a standard circuit, one may calculate the sample's noise spectrum in an arbitrary circuit if the loaded Q, power, and voltage pushing are known. Transit-time Gunn diodes are characterized by an equivalent noise temperature of 7500K which is comparable to the noise temperature of klystrons. (Author)

Descriptors :   (*SEMICONDUCTOR DIODES, MICROWAVE OSCILLATORS), (*MICROWAVE OSCILLATORS, RELIABILITY(ELECTRONICS)), ELECTROMAGNETIC COMPATIBILITY, NOISE(RADIO), INTERFEROMETERS, COMPUTER PROGRAMS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE