Abstract
We propose a simple method of measuring bit error rates (BERs) for rapid single fluxquantum (RSFQ) circuits operating at high frequencies. An error detector based on aSQUID current comparator, which operates without a timing clock, is employed to simplifythe test system and measurements. We successfully investigated high-frequency operationof RSFQ cells that were utilized to implement our RSFQ digital-to-analogue converter formetrology applications. Sufficiently low BERs were demonstrated in the circuit operationat several tens of gigahertz.
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