Published November 11, 1996
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A low-noise series-array Josephson junction parametric amplifier
Abstract
We have obtained parametric gain at 19 GHz from a distributed Josephson junction parametric amplifier whose active gain medium consists of a series array of 1000 Josephson junctions embedded in a coplanar waveguide. When cooled to 1.7 K the amplifier provides 16 dB gain in a mode where the internally generated double sideband noise referred to input is 0.5 ± 0.1 K. This noise is consistent with Nyquist noise generated from the losses. An instantaneous bandwidth of 125 MHz has been observed with a peak gain of 12 dB. The 3 dB compression point with a peak gain of 14.6 dB is -90.5 dB and the dynamic range is 38 dB.
Additional Information
© 1996 American Institute of Physics. (Received 15 July 1996; accepted 4 September 1996) We would like to thank Ron Miller for providing trilayers from which our devices were fabricated. We also wish to thank Mark Ketchen and the management and staff of the Si Technology and Superconductivity areas at IBM Research, Yorktown Heights, New York for the fabrication of the devices under the auspices of the Consortium for Superconducting Electronics.Attached Files
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