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DC SQUIDs as radiofrequency amplifiers

DC SQUIDs as radiofrequency amplifiers The optimization of radiofrequency amplifiers involving dc SQUIDs is discussed for both tuned and untuned input circuits. For a given frequency and input coil coupled to the SQUID, expressions are obtained for the optimum source resistance, gain, and noise temperature. The performance of two amplifiers designed according to these predictions is described. The gain of an untuned amplifier operated at 100 MHz and 4.2 K was 16.5±0.5 dB with a noise temperature of 3.8±0.9K; at 1.5 K the gain increased to 19.5±0.5 dB, while the noise temperature decreased to 0.9±0.4 K. A tuned amplifier operated at 93 MHz and 4.2 K had a gain of 18.6±0.5 dB and a noise temperature of 1.7±0.5 K. These results were in good agreement with predicted values. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

DC SQUIDs as radiofrequency amplifiers

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References (17)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00681635
Publisher site
See Article on Publisher Site

Abstract

The optimization of radiofrequency amplifiers involving dc SQUIDs is discussed for both tuned and untuned input circuits. For a given frequency and input coil coupled to the SQUID, expressions are obtained for the optimum source resistance, gain, and noise temperature. The performance of two amplifiers designed according to these predictions is described. The gain of an untuned amplifier operated at 100 MHz and 4.2 K was 16.5±0.5 dB with a noise temperature of 3.8±0.9K; at 1.5 K the gain increased to 19.5±0.5 dB, while the noise temperature decreased to 0.9±0.4 K. A tuned amplifier operated at 93 MHz and 4.2 K had a gain of 18.6±0.5 dB and a noise temperature of 1.7±0.5 K. These results were in good agreement with predicted values.

Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: Nov 6, 2004

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