Some Considerations of Stability in Lossy Varactor Harmonic Generators

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Abstract
Explicit expressions are derived for the scattering parameters which relate small-signal fluctuations in a lossy varactor harmonic generator of order N = 2n, n an integer. The effect of losses on the stability of the mutiplier is then studied. The very important particular case is then examined in which all the losses occur in the series resistance of the varactor diode, and it is shown that absolute stability is obtained provided the efficiency ηt of the multiplier ≪N−1, because of the particular distribution of the losses at various carrier frequencies. Therefore, the conclusion is reached that in most cases of practical interest restrictions have to be placed on the available circuit configurations to prevent instability of the multiplier.

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