The Renormalization Effects in the Microstrip-SQUID Amplifier
G. P. Berman, A. A. Chumak, and V. I. Tsifrinovich
TL;DR
This paper analyzes how the resonant input circuit affects the microstrip-DC SQUID amplifier, revealing frequency-dependent mutual inductance and conditions under which parameter renormalization vanishes.
Contribution
It introduces a detailed analysis of the frequency-dependent mutual inductance and renormalization effects in the microstrip-DC SQUID amplifier due to the input circuit's resonant structure.
Findings
Mutual inductance depends on electromagnetic frequency.
Renormalization effects vanish when Josephson frequency exceeds signal frequency.
Resonant structure significantly influences amplifier behavior.
Abstract
The peculiarities of the microstrip-DC SQUID amplifier caused by the resonant structure of the input circuit are analyzed. It is shown that the mutual inductance, that couples the input circuit and the SQUID loop, depends on the frequency of electromagnetic field. The renormalization of the SQUID parameters due to the screening effect of the input circuit vanishes when the Josephson frequency is much greater than the signal frequency.
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