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Electronics

Superconducting electronics

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Displaying 251 - 275 of 442

Double-stacked MoSi2-barrier junctions for programmable Josephson voltage standards

June 1, 2004
Author(s)
Yonuk Chong, Charles J. Burroughs, Paul D. Dresselhaus, Nicolas Hadacek, Hirotake Yamamori, Samuel P. Benz
We are developing MoSi2-barrier stacked junction arrays for Josephson voltage standards in order to increase the output voltage, operating bandwidth, and operating margins. In this paper we present results of a programmable voltage standard circuit with

More Diamagnetism Demonstrations

February 1, 2003
Author(s)
Chris Conery, Loren F. Goodrich, Theodore C. Stauffer
The availability of very strong permanent magnets allows observation of phenomena previously difficult to see. The diamagnetism of water and diamagneticly stabilized magnetic levitation are now easy to demonstrate.

Single-Cooper-Pair Transistors: Requirements for Robust 2e Periodicity

January 3, 2003
Author(s)
Joe Aumentado, Mark W. Keller, John M. Martinis
The superconducting analog of the single-electron transistor (SET), the single-Cooper-pair transistor (SCPT), is comprised of two ultrasmall tunnel junctions in series forming an island (see Figure 1(a)). Transport through the SCPT depends on the

Stacked Nanoscale Josephson Junction Arrays for High-Performance Voltage Standards

December 4, 2002
Author(s)
Samuel Benz, Paul Dresselhaus, Yonuk Chong, Charles J. Burroughs
Superconducting Josephson voltage standard systems have replaced electrochemical cell (battery-like) artifact standards for voltage metrology because quantum-based systems produce precise and accurate voltages independent of any material parameters. The

Refrigeration Methods for Superconductors

December 1, 2002
Author(s)
Ray Radebaugh
This chapter reviews various methods commonly used for achieving the cryogenic temperatures required of superconducting materials. The problems associated with cryogenic refrigerators (cryocoolers), such as poor reliability, low efficiency, electromagnetic

All-NbN Digital-to-Analog Converters for a Programmable Voltage Standard

November 21, 2001
Author(s)
Hirotake Yamamori, M. Itoh, H. Sasaki, A. Shoji, Samuel Benz, Paul Dresselhaus
Five-bit all-NbN digital-to-analog converters (DACs) for a programmable voltage standard have been fabricated using NbN/TiNx/NbN Josephson junctions and their operation has been demonstrated. The DAC consists of six arrays of 128, 128, 256, 512, 1024 and

Broadband Josephson Voltage Standards

May 20, 2001
Author(s)
Clark A. Hamilton, Samuel P. Benz
A Josephson junction is a perfect frequency to voltage converter, that is, V=f/K j where K j = 483597.9 GHz/V. This unique property has been used to convert a narrow (1 Hz) band 75 GHz reference frequency to a dc voltage standard. Josephson standards use

Coplanar Transmission Lines with Meandering Center Conductors in Y-Ba-Cu-O/Au Bilayers

June 1, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, R. Semerad
We have investigated both conventional and meandering coplanar microwave transmission lines patterned in Y-Ba-Cu-O/Au bilayers on yttria-stablized zirconia and sapphire substrates. Within the meandering waveguides, the gentre conductor was deformed from a

Operating Margins for a Superconducting Voltage Waveform Synthesizer

June 1, 1999
Author(s)
Samuel Benz, Clark A. Hamilton, Charles J. Burroughs
Operating margins for biolar superconducting voltage waveform synthesizer were measured. Current ranges were determined for 101 equally spaced dc voltage steps between - 18.6 and + 18.6 mV. The measured voltages of these steps deviated from the expected

Progress Toward an AC Josephson Voltage Standard

June 1, 1996
Author(s)
Clark A. Hamilton, Charles J. Burroughs, Samuel P. Benz
Progress toward a Josephson voltage standrd for fast dc measurements and ac waveform synthesis is described, including a version with SNS junctions operated at 11 GHz. A bias control circuit that achieves millampere drive capability, transient suppression
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