Comprehensive measurements of the parameters characterizing an rf-biased SQUID as a linear twoport are described. The behavior of the device corresponds in detail to the predictions of a recently published model of SQUID operation and is unexpectedly similar to that of a conventional reactive parametric amplifier. The measurements have been used to make the first reliable predictions of the noise temperature and optimum source impedance of an rf-biased SQUID.
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Giffard et al. (1978) studied this question.
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