Abstract
Two degenerate parametric amplifiers for the frequency of 3100 Mc/s are described. The first is a single-resonator type with a bandwidth of 140 Mc/s, a gain of 19 dB and an excess noise temperature of 84°K. The second uses an additional resonant circuit to increase the bandwidth to over 300 Mc/s, but the excess noise temperature is also increased to 180° K owing to additional losses. The gain and bandwidth of the amplifiers are near optimum.
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