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An optoelectronic testing system of rapid, single-flux quantum circuits

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5 Author(s)
Currie, M. ; Lab. for Laser Energetics, Rochester Univ., NY, USA ; Chia-Chi Wang ; Jacobs-Perkins, D. ; Sobolewski, R.
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We have generated picosecond voltage pulses on a superconducting microstrip line by using a metal-semiconductor-metal photodiode as an optoelectronic switch. These pulses are fed into a two-Josephson-junction pulse shaper to generate single-flux quantum (SFQ) pulses. Using a reflective electro-optic sampling system, SFQ pulses are directly observed for the first time. This important demonstration of nonintrusively detecting electrical signals from superconducting microstrip lines at the level of rapid, single-flux quantum (RSFQ) circuits opens up a new way to test such circuits, on issues such as design verification, jitter, and failure-mode testing. Further, we propose a variable-rate optoelectronic clock for testing the functional speed of RSFQ logic circuits, with an adjustable clock rate up to 38 Gb/s.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )