North-HoUand Publishing Company NEGATIVE RESISTANCE AND CONVERSION GAIN IN SIS MIXERS
نویسندگان
چکیده
We report the observation of negative quasiparticle dynamic resistance on the DC I-V curves of superconductor-insulator-superconductor tunnel junctions. This negative resistance appears on the first few photon assisted tunneling steps below 2A/e when our tin-tin oxide-tin tunnel junctions are pumped with a 36 GHz microwave current source. We present a simple analytical model which shows that large (and also negative) dynamic quasiparticle resistance is expected for junctions with sharp I-V curves when the microwave source impedance is high. Because the dynamic resistance can be very large, an impedance-matched quasiparticle mixer should have unlimited gain. We have observed a net mixer gain of 4.3±1 dB at 36 GHz with a mixer noise temperature ~IOK.
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