Accession Number : AD0764259

Title :   Noise in Microwave Semiconductor Oscillators and Amplifiers.

Descriptive Note : Interim rept. no. 2, 1 Jan-30 Nov 72,

Corporate Author : MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB

Personal Author(s) : Gupta,Madhu S. ; Haddad,George I. ; Lomax,Ronald J. ; Patterson,Joseph T.

Report Date : MAY 1973

Pagination or Media Count : 247

Abstract : ESTIGATION OF NOISE IN AVALANCHE TRANSIT-TIME DEVICES HAS BEEN CARRIED OUT. The main emphasis has been on oscillator noise which is characterized by AM and FM noise spectra. Detailed calculations have been carried out for determining the AM and FM noise in avalanche transit-time oscillators as a function of various operating parameters of the device, the diode structure and material properties as well as the external circuit. The theoretical results are compared with experimental results which were obtained for various operating points. These results lead to an improved understanding of noise in oscillators utilizing these devices. The effect of oscillator noise on the signal-to-noise ratio of a self-mixing avalanche-diode oscillator used in a short-range doppler radar is determined. AM noise is found to be the limiting factor with the contribution of video noise becoming important at low frequencies and small signal levels. (Modified author abstract)

Descriptors :   (*AVALANCHE DIODES, NOISE(RADIO)), MICROWAVE AMPLIFIERS, MICROWAVE OSCILLATORS, WAVEGUIDES, CIRCUITS, DOPPLER RADAR

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE