Memory effect in balanced Josephson comparators

•Balanced Josephson comparator decisions depend on previous decisions at high frequencies.•The maximum effective data rate is lower than the clock frequency.•Tradeoff between maximum effective data rate and minimum comparator gray-zone. The performance of a balanced Josephson comparator is measured...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2014-05, Vol.500, p.20-24
Main Authors: Ortlepp, Th, Volkmann, M.H., Yamanashi, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Balancing
Clocks
Comparator
Comparators
Correlation
Electronics
Exact sciences and technology
Maximum data rate
Memory effect
Sampling frequency
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconducting electronics
Superconductivity
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Summary:•Balanced Josephson comparator decisions depend on previous decisions at high frequencies.•The maximum effective data rate is lower than the clock frequency.•Tradeoff between maximum effective data rate and minimum comparator gray-zone. 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.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2014.02.003