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Applied Physics Letters / Volume 97 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 092507 (2010); http://dx.doi.org/10.1063/1.3486156 (3 pages)

Microstrip superconducting quantum interference device amplifiers with submicron Josephson junctions: Enhanced gain at gigahertz frequencies

M. P. DeFeo1, P. Bhupathi1, K. Yu1, T. W. Heitmann1, C. Song1, R. McDermott2, and B. L. T. Plourde1

1Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA
2Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

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(Received 5 August 2010; accepted 13 August 2010; published online 2 September 2010)

We present measurements of an amplifier based on a dc superconducting quantum interference device (SQUID) with submicron Al–AlOx–Al Josephson junctions. The small junction size reduces their self-capacitance and allows for the use of relatively large resistive shunts while maintaining nonhysteretic operation. This leads to an enhancement of the SQUID transfer function compared to SQUIDs with micron-scale junctions. The device layout is modified from that of a conventional SQUID to allow for coupling signals into the amplifier with a substantial mutual inductance for a relatively short microstrip coil. Measurements at 310 mK exhibit gain of 32 dB at 1.55 GHz.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium, aluminium compounds, microstrip lines, SQUIDs, UHF amplifiers

PACS

  • 85.25.Dq

    Superconducting quantum interference devices (SQUIDs)

  • 84.40.Az

    Waveguides, transmission lines, striplines

  • 84.30.Le

    Amplifiers

  • 84.40.Lj

    Microwave integrated electronics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3486156

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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