Abstract
We have investigated mixing and parametric amplification with high- T c superconductor microbridges both experimentally and theoretically. The microbridges were operated as down converters, converting a 20 GHz radio frequency (RF) signal to a 1.5 GHz intermediate frequency (IF) signal under the action of an 18.5 GHz local oscillator (LO). In this paper, we show that the resistively shunted junction (RSJ) model agrees with the experimentally observed behavior. The RSJ model accurately describes the performance of the microbridges, predicting weak conversion in the parametric regime and high conversion gain in the mixing regime.
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