MODELING OF HIGH-T(C) SUPERCONDUCTOR PARAMETRIC-AMPLIFIERS AND MIXERS

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