Abstract
A computer-automated superconductive 55 GHz sampling oscilloscope based on 4 kA/cm2, Nb/Nb2O5/Pb edge Josephson junctions is presented. The Josephson sampler chip was flip-chip bonded to a carrier chip with a coplanar transmission line by use of a novel flip-chip bonding machine. A 5.6 ps step pulse was successfully coupled in to the transmission line and 18.5 GHz multiple reflections plus a parasitic oscillation at 43 GHz were observed.
Highlights
For about ten years Josephson sampling oscilloscopes have been used in a wide range of cryogenic experiments to observe electronic signals with microampere amplitude and picoseconds rise time. 1-4 As the result of a collaboration between IBM Research Center, Yorktown Heights and Physics Laboratory I, The Technical University of Denmark we have a computerized 2-55 GHz sampling oscilloscope with a sensitivity of about 1 Z.LA.The measurement data are stored as sequential files and postprocessing is possible with a variety of programs
55 GHz sampling oscilloscope based on 4 kA
flip-chip bonded to a carrier chip with a coplanar transmission line
Summary
For about ten years Josephson sampling oscilloscopes have been used in a wide range of cryogenic experiments to observe electronic signals with microampere amplitude and picoseconds rise time. 1-4 As the result of a collaboration between IBM Research Center, Yorktown Heights and Physics Laboratory I, The Technical University of Denmark we have a computerized 2-55 GHz sampling oscilloscope with a sensitivity of about 1 Z.LA.The measurement data are stored as sequential files and postprocessing is possible with a variety of programs. The 5-20 ,um spacing between the sampler chip and the carrier chip, which is typical for the flip-chip bonding technique, makes it possible to obtain much lower inductance leads to the sampling circuit than would be possible using traditional bond wires. This advantage is increasingly important as the signal frequency goes up into the GHz “Presently at the Electrotechnical Laboratory, l-l-4 Umezono, Tsukuba Science City, 305 Ibaraki, Japan. It should be noticed that hysteretic Josephson junctions were recently fabricated by Virshup et al ‘* using high temperature superconductors By utilizing such junctions it will be possible to operate superconductive samplers at higher temperatures in the future
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