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Search Publications by: Samuel P. Benz (Fed)

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Displaying 401 - 425 of 558

Operating Margin Measurements for an AC Josephson Voltage Standard

August 17, 2003
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
For a number of years, NIST has been developing a Josephson arbitrary waveform synthesizer as an ac Josephson Voltage Standard (ACJVS). The effort has primarily focused on increasing the output voltage to practical levels. Recent advances in circuit design

Stacked SNS Josephson Junctions for Quantum Voltage Applications

July 11, 2003
Author(s)
Paul Dresselhaus, Yonuk Chong, Samuel Benz
NIST is using SNS Josephson junctions as the basis of quantum voltage metrology. Planar junction technology limits the voltage and bandwidth of these systems due to parasitic inductances and the transit time of waveforms through the transmission line. By

4K Cryocooler Implementation of a DC Programmable Voltage Standard

June 1, 2003
Author(s)
Charles J. Burroughs, Robert J. Webber, Paul Dresselhaus, Samuel Benz
NIST and Hypres, Inc. have been collaborating to develop a 1 Volt DC programmable Josephson voltage standard (PJVS) that operates on a closed-cycle refrigerator. The goal of this work is to construct a platform that will allow the chip to work at 4 K

Stacked SNS Josephson Junction Arrays for Quantum Voltage Standards

June 1, 2003
Author(s)
Paul Dresselhaus, Yonuk Chong, J. Plantenberg, Samuel Benz
NIST is using and developing superconductor-normal metal-superconductor (SNS) Josephson arrays for both programmable DC and AC voltage standards. Increasing the output voltage is difficult because the output voltage per junction is small; hence series

AC Josephson Voltage Standard Error Measurements and Analysis

April 1, 2003
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
The Josephson arbitrary waveform synthesizer can be used as a precision voltage source for both ac and dc signals. Recent improvements in circuit designs have resulted in output voltages greater than 100 mVrms so that we can investigate ac metrology

An AC Josephson Source for Johnson Noise Thermometry

April 1, 2003
Author(s)
Samuel Benz, John M. Martinis, Paul Dresselhaus, Sae Woo Nam
We have adapted the Josephson arbitrary waveform synthesizer to create a quantized voltage noise source suitable for calibrating the cross-correlation electronics of a Johnson noise thermometer system. The requirements of long term stability and low

Johnson Noise Thermometry Measurements Using a Quantized Voltage Noise Source for Calibration

April 1, 2003
Author(s)
Sae Woo Nam, Samuel Benz, Paul Dresselhaus, Weston L. Tew, David R. White, John M. Martinis
We describe a new approach to Johnson Noise Thermometry(JNT) that takes advantage of recent advances in Josephson voltage standards and digital signal processing techniques. Currently, high-precision thermometry using Johnson noise is limited by the non

A ratiometric method for Johnson noise thermometry using a quantized voltage noise source

January 1, 2003
Author(s)
Sae Woo Nam, Samuel Benz, John M. Martinis, Paul Dresselhaus, Weston L. Tew, David R. White
Johnson Noise Thermometry (JNT) involves the measurement of the statistical variance of a fluctuating voltage across a resistor in thermal equilibrium. Modern digital techniques make it now possible to perform many functions required for JNT in highly

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