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Radio-frequency amplifiers based on dc SQUIDs
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DOI：10.1088/0953-2048/23/9/093001.png)
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SQUIDs are an attractive candidate for the amplification of low-level rf and microwave signals. Compared to semiconductor amplifiers, they offer lower noise and much lower power dissipation. Especially at frequencies below 1 GHz, the improvement in noise temperature compared to the best cold semiconductor amplifiers can be as high as 50; noise temperatures only slightly above the quantum limit have been achieved in this frequency range. This article will review the current status of radio-frequency amplifiers based on dc SQUIDs and provide detailed discussions of amplifier noise temperature, input and output impedance, and nonlinearities.
Keyword:
QUANTUM INTERFERENCE DEVICE
RF AMPLIFIER
PARAMETRIC AMPLIFICATION
NOISE
OPTIMIZATION
SEARCHES
SIGNAL
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