Abstract
The bandwidth characteristics of two-idler parametric amplifiers are investigated, and an approximate equivalent circuit derived. It is shown that under certain conditions the input impedance Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in</sub> is nearly constant and independent of pump amplitude over a relatively wide bandwidth. Computer analysis of particular one- and two-idler amplifiers has yielded comparable bandwidths and noise figures for a single-idler amplifier with a compensating resonator at its input, and a twoidler amplifier. Measured results are given for an experimental two-idler amplifier.
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