Abstract
In the present paper the parametric amplifier is analysed in terms of its equivalent circuit. Three resonant circuits with resonant frequencies W1 W2 and W3 known as signal, idling and pump respectively are coupled to a nonlinear variable capacitance. The charge in the non-linear capacitance is assumed to vary as a quadratic function of the voltage across it. Expressions for the parametric gain, net power gain, bandwidth and noise figure for the two cases of the negative conductance amplifier, one in which the signal and idling frequencies are well separated and the other in which the two frequencies are same, have been obtained.
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