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Search Publications by: Samuel P. Benz (Fed)

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Displaying 226 - 250 of 289

A New Approach to Johnson Noise Thermometry using a Josephson Quantized Voltage Source

April 1, 2002
Author(s)
Samuel Benz, John M. Martinis, Sae Woo Nam, Weston L. Tew, David R. White
We describe a new approach to Johnson Noise Thermometry (JNT) that addresses certain limitations found in the conventional approach. The concept takes advantage of recent advances in digital synthesis and signal processing techniques together with advances

Nanotechnology for Next Generation Josephson Voltage Standards

December 1, 2001
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We have developed two voltage standard systems: 1) the programmable Josephson voltage standard and 2) the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable dc voltages from -1.2 V to +1.2

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

AC and DC Voltages From a Josephson Arbitrary Waveform Synthesizer

May 7, 2001
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus, Laurie Christian
We have synthesized and measured ac and dc voltages using a Josephson arbitrary waveform synthesizer. On-chip filtering has enabled the first practical operating margins for ac and arbitrary waveforms. Using a digital voltmeter, we demonstrate the

Nanotechnology for Next-Generation Josephson Voltage Standards

August 30, 2000
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We have developed two voltage standard systems: the programmable Josephson voltage standard and the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable DC voltages from -1.2 V to +1.2 V. The

Low Harmonic Distortion in a Josephson Arbitrary Waveform Synthesizer

August 14, 2000
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus
The use of broadband integrated filters has enabled practical operating margins for ac waveforms synthesized from the perfectly quantized voltage pulses of Josephson junction arrays. This improvement enabled the digital synthesis of arbitrary waveforms

1 Volt Josephson Fast Reversed DC Source

May 1, 2000
Author(s)
Charles J. Burroughs, Samuel Benz, Todd E. Harvey, H. Sasaki
We have made several improvements to the NIST Josephson FRDC (fast reversed dc) source so that it now operates at 1 Volt. We have made a precision comparison to a conventional semiconductor FRDC source by measuring the thermoelectric transfer difference of

DC Voltage Synthesis Using a Pulse-Quantized Josephson Voltage Source

May 1, 2000
Author(s)
Samuel Benz, Laurie Christian, Charles J. Burroughs, Clark A. Hamilton
We have synthesized and measured dc voltages using a bipolar pulse-quantized Josephson voltage waveform synthesizer. Bias current ranges were determined for 101 equally spaced dc voltage steps between -18.6 and +18.6 mV. The flatness of a step at -7.444 mV

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

December 31, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, C. Buchal, 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

1 Volt DC Programmable Josephson Voltage Standard System

June 1, 1999
Author(s)
Charles J. Burroughs, Samuel Benz, Todd E. Harvey, Clark A. Hamilton
NIST has developed a programmable Josephson voltage standard (JVS) that produces intrinsically stable voltages that are programmable from -1.1 V to +1.1 V.

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 Conditions for a Pulse-Quantized AC and DC Bipolar Voltage Source

June 1, 1999
Author(s)
Samuel Benz, Charles J. Burroughs, Todd E. Harvey, Clark A. Hamilton
We have developed an accurate ac and dc bipolar voltage source based on the quantized pulses of Josephson junctions. A factor-of-6 increase in output voltage over previous unipolar waveforms is achieved by generating bipolar waveforms where arrays of

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

Superconducting Thin-Film Transformers at Microwave Frequencies

June 1, 1999
Author(s)
A. H. Miklich, J. X. Przybysz, T. J. Smith, Samuel Benz, Todd E. Harvey
We describe the use of thin-film superconducting transformers at frequencies up to 20 GHz. Transformers with turns ratios of 2,3, and 7 were fabricated out of Nb and tested in a liquid-He Dewar. The measured S-parameters showed considerably less bandwidth

Programmable 1 V DC Voltage Standard

April 1, 1999
Author(s)
Charles J. Burroughs, Samuel Benz, Clark A. Hamilton, Todd E. Harvey
We have developed a Josephson voltage standard that produces intrinsically stable voltages that are programmable of 32 768 SNS (superconductor-normal-superconductor) Josephson junctions. The output can source or sink up to 2 mA and thus has high noise
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