A 220 MC parametric amplifier requiring low pump power

This paper describes the design and performance of a 220 mc negative-resistance parametric amplifier which enables the design of a low-noise, all solid-state UHF receiver. The parametric amplifiers previously described in the literature required considerable pump power, which generally precluded the use of transistorized pump sources. This amplifier, which uses less than 0.1 milliwatt of pump power thereby permitting a crystal-controlled transistorized pump, has a noise figure between 1 and 2 db and a reasonably stable gain of 13 db without using a circulator or isolator.