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Radio-frequency amplifier with tenth-kelvin noise temperature based on a microstrip direct current superconducting quantum interference device

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5 Author(s)
Andre, Marc-Olivier ; Department of Physics, University of California, Berkeley, California 94720-7300 ; Muck, Michael ; Clarke, John ; Gail, Jost
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A dc superconducting quantum interference device (SQUID) with a resonant microstrip input and a cooled heterostructure field-effect transistor as a postamplifier is used as a radio-frequency amplifier in the frequency range 90–500 MHz. At liquid 3He temperatures, gains of 24 and 20 dB and intrinsic noise temperatures of 0.06±0.02 and 0.12±0.10 K were achieved at 89.6 and 438 MHz, respectively. The system noise temperature at 438 MHz was also estimated from the Nyquist noise produced by a resonant circuit coupled to the input of the microstrip SQUID. © 1999 American Institute of Physics.

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Applied Physics Letters  (Volume:75 ,  Issue: 5 )