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

被引:0
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作者
André, MO [1 ]
Mück, M
Clarke, J
Gail, J
Heiden, C
机构
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Univ Giessen, Inst Angew Phys, D-35392 Giessen, Germany
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中图分类号
O59 [应用物理学];
学科分类号
摘要
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 He-3 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. (C) 1999 American Institute of Physics. [S0003-6951(99)02731-X].
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页码:698 / 700
页数:3
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