Ranzani, L.
, Spietz, L.
and Aumentado, J.
(2013),
Broadband S-parameter characterization of a DC-SQUID amplifier, Applied Physics Letters, [online], https://doi.org/10.1063/1.48135
(Accessed October 9, 2025)
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Broadband S-parameter characterization of a DC-SQUID amplifier
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Abstract
In this work we characterize the 2-port scattering parameters of a superconducting quantum interference device (DC-SQUID) ampli er at 20 mK in the 2{8 GHz band. The measurement reference plane is positioned on a 6.25 microstrip line situated directly at the input and output of the device by means of a thru-reflect-line cryogenic calibration procedure. From the scattering parameters, we derive the device available power gain, isolation and input impedance over the 2{8 GHz range. This measurement methodology provides a path towards designing wide-band matching circuits for low impedance superconducting ampli ers operating at dilution refrigerator temperatures.Citation
Applied Physics Letters
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Created July 8, 2013, Updated October 14, 2020