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Search Publications by: Dylan Williams (Fed)

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Displaying 276 - 300 of 583

Complete waveform characterization at NIST

June 8, 2008
Author(s)
Paul D. Hale, Tracy S. Clement, Darryl A. Keenan, Dylan F. Williams, Arkadiusz C. Lewandowski, C. M. Wang, Andrew Dienstfrey
We present a method for calibrating the voltage a pulse generator delivers to a load at every point in the measured waveform epoch. The calibration includes an equivalent circuit model of the generator so that the user can calculate how the generator will

The Beginnings of This TRANSACTIONS

March 1, 2008
Author(s)
Dylan F. Williams, Admir Mortazawi
In July, 1951, Ben Warriner (chairman, 1952-1953) circulated a petition to begin the Microwave Theory and Techniques Society under the auspices of the Institute of Radio Engineers. Despite an initial lack of support from the IRE, the roots of the

Comb-Generator Characterization

February 1, 2008
Author(s)
Howard C. Reader, Dylan Williams, Paul D. Hale, Tracy S. Clement
We characterize a 50 GHz comb generator measured on a sampling oscilloscope. With careful control of the input power, input harmonics and comb generator temperature, we find the output spectrum to be stable to 0.1 dB and 0.5 degrees. We correct results for

Absolute Magnitude and Phase Calibrations

October 1, 2007
Author(s)
Kate Remley, Paul D. Hale, Dylan Williams
In VNA measurements, the magnitude and phase of a transmitted or reflected wave are measured relative to that of the incident wave. VNA measurements are made a single frequency at a time and each frequency component is acquired relative to the internally

Chip-level Security for RFID Smart Cards and Tags

September 4, 2007
Author(s)
Dylan Williams, Kate Remley
This report on RFID chip-level security is written to help both technical and non-technical audiences navigate the complex chip-level security features of RFID smart cards and tags, and make intelligent security choices. The report explores both attacks

Systematic Error of the Nose-to-Nose Sampling-Oscilloscope Calibration

September 1, 2007
Author(s)
Dylan Williams, Tracy S. Clement, Kate Remley, Paul D. Hale, F. Verbeyst
We use traceable swept-sine and electrooptic-sampling-system-based-sampling-oscilloscope calibrations to measure the systematic error of the nose-to-nose calibration, and compare the results to simulations. Our results show that the errors in the nose-to

The Sampling Oscilloscope as a Microwave Instrument

August 1, 2007
Author(s)
Dylan Williams, Paul D. Hale, Kate Remley
Many modern high-speed oscilloscopes are well suited for precise microwave waveform, modulated-signal, and nonlinear measurements. These oscilloscopes have bandwidths of up to 100 GHz and are available with nominally 50 ? input impedances. Like their low

RFID Devices and Systems in Homeland Security Applications

July 1, 2007
Author(s)
Kate Remley, Jeffrey R. Guerrieri, Dylan Williams, David R. Novotny, Anthony B. Kos, Nelson Bryner, Nader Moayeri, Michael Souryal, Kang Lee, Steven Fick
This article reports on activities being carried out by the National Institute of Standards and Technology to ensure secure, reliable use of Radio-Frequency Identification (RFID) technology in homeland security and public safety applications. These

Compensation of Random and Systematic Timing Errors in Sampling Oscilloscopes

December 1, 2006
Author(s)
Paul D. Hale, C. M. Wang, Dylan Williams, Kate Remley, Joshua Wepman
In this paper, a method of correcting both random and systematic timebase errors using measurements of only two quadrature sinusoids made simultaneously with a waveform of interest is described. The authors estimate the fundamental limits to the procedure

Terminology for High-Speed Sampling-Oscilloscope Calibration

December 1, 2006
Author(s)
Dylan Williams, Tracy S. Clement, Paul D. Hale, Andrew Dienstfrey
We discuss procedures for calibrating high-speed sampling oscilloscopes at the National Institute of Standards and Technology, and the terminology associated with those calibrations. The discussion clarifies not only the calibration procedures, but how to

Shielding And Attenuation Properties of Large Buildings and Structures

September 4, 2006
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Kate Remley, S. A. Schima, Dylan Williams
For various applications, there is a growing need to understand the shielding and/or attenuation properties of large buildings and structures. In this paper, we present experimental data for the coupling of electromagnetic fields into various types of