Switching Time Versus DC Current Overdrive of a Josephson Junction Sampler
- Resource Type
- Periodical
- Authors
- Van Zeghbroeck, B.J.
- Source
- IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 34(3):1-4 May, 2024
- Subject
- Fields, Waves and Electromagnetics
Engineered Materials, Dielectrics and Plasmas
Switches
Junctions
Damping
Josephson junctions
Numerical models
Detectors
Symbols
Josephson
overdrive
sampler
simula- tion
superconductor
switching
- Language
- ISSN
- 1051-8223
1558-2515
2378-7074
The time resolution of a Josephson junction sampler depends on the switching time of the junction. This switching time depends on the junctions’ plasma frequency and McCumber parameter, but also on the amount of overdrive current applied. An approximate closed form expression is derived for the switching time as a function of the overdrive, excluding damping or noise. A key result is that the switching time depends logarithmically on the overdrive. Numeric simulations are used to justify the approximations made and reveal the dependence on damping. Comparisons are made between the analytic expression and a numeric simulation of the switching time. Application of the results to a Josephson sampler is presented.