Two-diode bandpass parametric amplifier

The gain-bandwidth performance of a filter-type degenerate parametric amplifier incorporating two synchronously pumped varactor diodes is analysed for general conditions, in which the source and load are not necessarily matched to the characteristic impedance of the filter. The diodes are the shunt capacitive elements in a conventional bandpass filter. Experimental work carried out in the h.f. band confirms the theory. The potential bandwidth of this type of amplifier is very great.