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IEEE Transactions on Magnetics

A Josephson effect parametric amplifier at 36 GHz

Y. Taur, P. L. Richards

Published Jan 1, 1977• 3 citations
Publisher

Abstract

Doubly degenerate parametric amplification by a point contact Josephson junction is observed at 36 GHz. The best amplifier showed a net gain of 11 dB and a noise temperature less than 50 K.
DOI
10.1109/tmag.1977.1059420

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Parametric amplification and oscillation at 36 GHz using a point-contact Josephson junction

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IEEE Transactions on Electron Devices•Oct 1, 1980•17 citations
We have observed doubly degenerate parametric amplification and oscillation at 36 GHz from a single point-contact Josephson junction. The experimental results agree qualitatively with theoretical calculations based on the resistively shunted junction model. The estimated noise temperature of an amplifier with 11 dB net gain is consistent with zero, but has an upper limit of 50 K. Attempts to observe parametric amplification in the singly degenerate mode with a pump frequency of 72 GHz were not successful.
We have observed doubly degenerate parametric amplification and oscillation at 36 GHz from a single point contact Josephson junction. The experimental results agree qualitatively with theoretical calculations based on the resistively shunted junction model. The estimated noise temperature of an amplifier with 11 dB net gain is consistent with zero, but has an upper limit of 50 K. Attempts to observe parametric amplification in the singly degenerate mode with a pump frequency of 72 GHz were not successful. (Author)
Doubly degenerate parametric amplification and oscillation at 36 GHz was observed from a single point contact Josephson junction. The experimental results agree qualitatively with theoretical calculations based on the resistively shunted junction model. The estimated noise temperature of an amplifier with 11 dB net gain is consistent with zero, but has an upper limit of 50 K. Attempts to observe parametric amplification in the singly degenerate mode with a pump frequency of 72 GHz were not successful.
Progress on the development of a low-noise superconducting parametric amplifier operated at liquid helium temperatures and designed for practical use with a radio telescope at 33 GHz is reported. Series arrays of small Pb - Pb oxide - Pb tunnel junctions (\sim 20 \mum × 20 μm) are coupled in a microstrip configuration and the Josephson device is operated as a reflection-type amplifier in the doubly degenerate mode. Various practical considerations in using such a devise on a telescope are reviewed. In preliminary experiments, gains of greater than 13 dB have been observed near 33 GHz.
A unified theory of the singly and doubly degenerate Josephson-junction parametric amplifier is presented. Experiments with single junctions on both amplifier modes at frequencies 10, 35, and 70 GHz are discussed. Low-noise temperature (∼100 K, single sideband (SSB)) and reasonable gain (∼8 dB) were obtained at 35 GHz in the singly degenerate mode. On the basis of the theory and experiments, a general procedure for optimizing junction parameters is discussed and illustrated by the specific design of a 100-GHz amplifier.