Dynamic transfer properties of frequency multipliers

Noise and transfer properties of frequency multipliers with step-recovery diodes and depletion-layer varactors are investigated both theoretically and experimentally. Parameters are the multiplication factor the number of diodes drive level and detuning of the input frequency, the bias conditions and the terminations at the harmonics. Distortions of angle-modulated signals mainly originate in AM-PM-conversion whereas the intrinsic noise plays only a subordinate role. Fixed bias and detuning either the input or the output circuit are remedy against this source of distortion. The bias modulation sensitivity is also investigated snowing that the bias supply voltage must be carefully stabilised in order to reduce the PM output noise.