Coupling of current and frequency-modulated noise in Gunn oscillators

This brief report is concerned with an experimental investigation of the correlation coupling of the frequency-modulated and current noise of Gunn oscillators at low frequencies of wave selections from the carrier F, as well as refinement of the relations which couple the absolute levels of the noise. A waveguide oscillator served as the object of the investigation, and a Type AA703 diode was used as the active element. The correlation coefficient of the frequency and current fluctuations rho was measured by a method described in a 1977 paper. The results of measurement of rho at various frequencies F are presented. As a whole the values obtained indicate the existence of an appreciable correlation of current and FM noise.