Parametric amplifiers and converters with pumped inductance and capacitance

It is shown that when both inductance and capacitance are pumped in a parametric amplifier or converter, a special kind of resonance involving only the variable parts of the L and C may occur and produce null responses. An equivalent circuit has been devised for the up-converter, in which an idealized frequency-converter appears. Doublesideband converters are also briefly considered.