Abstract
ABSTRACT Using the general analysis for the admittance of non-linear temperature-dependent circuit elements, the conditions for small amplitude oscillation are deduced. The results are applied to two types of semiconductor device, the thermistor and the germanium point-contact rectifier. The negative temperature coefficient of resistance and the thermal inertia of these devices endows their a.c. impedance with an inductive reactance in series with a resistance which can be negative under suitable operating conditions. When shunted with a capacitance they are consequently capable of sustained oscillations. The dependence of oscillation frequency on shunt capacitance and the upper limiting frequency are deduced in terms of the fundamental parameters of the device. Departures from the postulated model which can arise with the point-contact rectifier are discussed.
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