Abstract
A superconducting Josephson sampling measurement system with excellent time resolution on the picosecond scale is a highly useful tool for analysing ultrahigh-speed electrical signals in a cryogenic environment. The Josephson sampling circuit was designed and fabricated with high-Jc Nb/AlOx/Nb junction integrated circuit technology. A time domain reflectometry (TDR) measurement system using a superconducting sampling circuit and a superconducting step signal generator has been developed. TDR measurement of superconducting microstrip lines was successfully carried out with a 6 ps rise time step signal. The electrical characterization of the microstrip lines was achieved.
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