DocumentCode :
1070379
Title :
Minimum-width control-current pulse for Josephson logic gates
Author :
Dhong, Sang H. ; Van Duzer, Theodore
Author_Institution :
University of California, Berkeley, CA
Volume :
27
Issue :
10
fYear :
1980
fDate :
10/1/1980 12:00:00 AM
Firstpage :
1965
Lastpage :
1973
Abstract :
For a given level of overdrive, there exists a minimum-width control-current pulse that must be applied to switch a Josephson logic gate. Determination of this minimum pulsewidth is useful in setting limits on the speed of various Josephson circuit configurations and also in finding the narrowest pulse that a Josephson-junction gate can detect when it is employed as a pulse detector. The minimum control-current pulsewidth is a strong function of the overdrive factor of the control current. It scales as (C/I_{m})^{1/2} , where Imis the junction critical current, and C is the capacitance, and is on the order of 10 ps for Josephson quantum interferometers in 5-µm technology. Computer simulations have been done to find the dependence of minimum control-current pulsewidths on overdrive magnitude for a single-junction gate and for two- and three-junction interferometers. Analytic expressions of the minimum control-current pulsewidth that are in good agreement with simulations have been obtained for these three types of Josephson logic gates.
Keywords :
Computational modeling; Computer simulation; Critical current; Detectors; Interferometers; Josephson junctions; Pulse circuits; Quantum capacitance; Space vector pulse width modulation; Switches;
fLanguage :
English
Journal_Title :
Electron Devices, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9383
Type :
jour
DOI :
10.1109/T-ED.1980.20133
Filename :
1480926
Link To Document :
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