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The conventional quasi-one junction SQUID (QOS) as a comparator must have a loop inductance less than a threshold. Such a small loop inductance cannot be realized in high temperature superconductor (HTS) having larger sheet inductance. We suggest novel comparators based on QOS for HTS material, in which a few circuits are added to the QOS. The comparator operation is shown in analog simulation. It results in high accuracy below the sampling rate of 50 GS/s by use of typical YBCO junction parameters. The comparator operation at extremely high sampling rate over 100 GS/s is also feasible.
Date of Publication: June 2003