Abstract
A large-signal noise theory to second order in the r.f. amplitude is developed for the noise generator of an IMPATT oscillator of Read-type. The coefficient for the second order term in the noise spectrum is calculated as function of frequency. The large-signal noise measure is shown to increase less than 3 dB from the small-signal noise measure for avalanche current modulations of J 1 J 0 = 1 , where J 0 is the bias current. Good noise performance is predicted when the operating frequency is a factor of 1·4 higher than the avalanche frequency.
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