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You searched on: Author: chih-ming wang

Displaying records 11 to 20 of 68 records.
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11. A statistical study of de-embedding applied to eye diagram analysis
Published: 2/1/2012
Authors: Paul D Hale, Jeffrey A Jargon, Chih-Ming Wang, Brett Grossman, Matthew Claudius, Jose Torres, Andrew M Dienstfrey, Dylan F Williams
Abstract: We describe a stable method for calibrating digital waveforms and eye diagrams using the measurement system response function and its regularized inverse. The function describing the system response includes the response of the oscilloscope and any ...

12. On Non-Linear Estimation of a Measurand
Published: 11/7/2011
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: We consider an estimation problem described in the Guide to the Expression of Uncertainty in Measurement (GUM). The problem is concerned with estimating a measurand that is a non-linear function of input quantities. The GUM describes two methods for ...

13. On Multiple-Method Studies
Published: 10/4/2010
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: In this paper we review statistical models that describe measurements from a multiple-method study such as in the development of a reference material. We also review requirements for the so-called GUM compliance as this appears to be an important cri ...

14. Use of Electronic Calibration Units for Vector-Network-Analyzer Verification
Published: 7/30/2010
Authors: Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, Denis X LeGolvan, Ronald A Ginley, Chih-Ming Wang, Jolene D Splett
Abstract: We present measurements indicating that electronic calibration units are stable enough to be used in place of mechanical vector-network-analyzer verification artifacts. This enables a new fully automated approach to verifying microwave vector-network ...

15. On interchangeability of two laboratories
Published: 6/18/2010
Authors: Chih-Ming Wang, Hariharan K Iyer
Abstract: This paper proposes a measure for assessing the degree of equivalence between the two laboratories in a key comparison. The measure is called asymmetric degree of interchangeability. It is asymmetric since, based on this measure, a laboratory may be ...

16. Identifying RF Identification Cards from Measurements of Resonance and Carrier Harmonics
Published: 5/27/2010
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang, Timothy X. Brown
Abstract: We show that careful measurements of the unloaded resonant frequency and quality factor of radio frequency identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with mini ...

17. Correcting sampling oscilloscope timebase errors with a passively mode-locked laser that is phase-locked to a microwave oscillator
Published: 4/1/2010
Authors: Jeffrey A Jargon, Paul D Hale, Chih-Ming Wang
Abstract: In this paper, we describe an apparatus for correcting the timebase errors when calibrating the response of an equivalent-time sampling oscilloscope using a passively mode-locked erbium doped fiber laser that is phase locked to a microwave signal gen ...

18. Uncertainty calculation for spectral-responsivity measurements
Published: 9/1/2009
Authors: John H Lehman, Chih-Ming Wang, Marla L Dowell, Joshua Aram Hadler
Abstract: This paper discusses a procedure for measuring the absolute spectral responsivity of optical-fiber power meters and computation of the calibration uncertainty. The procedure reconciles measurement results associated with a monochromator-based measure ...

19. Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards
Published: 5/2/2009
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang
Abstract: We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of measuring the elect ...

20. Calculation of pulse parameters and propagation of uncertainty
Published: 3/1/2009
Authors: Paul D Hale, Chih-Ming Wang
Abstract: The fundamental starting point for the analysis of all two-state waveforms is the determination of the low- and highstate levels. This is a two-step process. First, the data are grouped into points belonging to each state, and second, the value of ea ...

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  • SP 250-XX: Calibration Services
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