Abstract
The performance of a balanced Josephson comparator is measured by its gray-zone and its maximum operation frequency. A typical effect at high clock frequencies is the correlation of output bits with their predecessors, the comparator develops a memory. This is undesirable, as it imposes an upper limit on the useful clock frequency at which the comparator can be operated.In this work, we describe and observe experimentally the memory effect of a Josephson comparator and study its influence on the gray zone width and the maximum effective data rate.
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