VARACTOR-CONTROLLED PN JUNCTION SEMICONDUCTOR MICROWAVE OSCILLATION DEVICE

摘要

A solid state microwave generating device comprising a 3-terminal element having a p-n junction representing a negative resistance and a junction of which the junction capacitance is varied according to a voltage applied thereto. A reverse voltage is imparted to said p-n junction so that the latter is maintained in a negative resistance condition resulting from an avalanche current. The other junction is set to a suitable reactance value so as to produce a microwave of a tuned wavelength, and under such a condition a modulating signal is supplied in superimposition to said other junction to thereby change the reactance value thereof, thus effecting microwave modulation. With this device, the oscillation wave occurring in a resonator circuit is controlled in accordance with lumped constants so that the tuning operation of the resonant circuit, modulation (FM), automatic frequency control (AFC) and so forth can be easily and efficiently performed.