Design of wide-band degenerate parametric amplifiers for 3100 Mc/s

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.