Title :
Achieving Sub-100-ns Switching of Programmable Josephson Arrays
Author :
Williams, Jonathan M. ; Henderson, Dale ; Patel, Pravin ; Behr, Ralf ; Palafox, Luis
Author_Institution :
National Phys. Lab.
fDate :
4/1/2007 12:00:00 AM
Abstract :
The accuracy of voltage waveforms, generated using programmable Josephson junction arrays, is limited by the time taken to switch between quantized levels. Relevant parameters are the time constants within the array chip, the characteristics of the cables, and the bandwidth of the bias electronics. A drive system for a 1-V SINIS array with 8192 junctions has been optimized, and a cable scheme has been devised which compensates for cable reflections. The measurements of the array´s temporal response, made with this cable system, are compared to an RC model, both with 3- and 7-ns single time constants
Keywords :
superconducting arrays; superconducting cables; superconductor-insulator-superconductor devices; 1 V; 3 ns; 7 ns; RC model; SINIS array; array´s temporal response; cable reflections; cable system; programmable Josephson junction arrays; superconductor-insulator-normal conductor-insulator-superconductor junctions; voltage waveforms; AC generators; Cables; Capacitance; Frequency; Joining processes; Josephson junctions; Laboratories; Superconducting devices; Switches; Voltage; Josephson junction array; temporal response; waveform synthesis;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891155
