Title :
Uncertainty of oscilloscope timebase distortion estimate
Author :
Wang, C.M. ; Hale, Paul D. ; Coakley, Kevin J. ; Clement, Tracy S.
Author_Institution :
Stat. Eng. Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
2/1/2002 12:00:00 AM
Abstract :
We study several problems related to the characterization of the timebase in high-speed sampling oscilloscopes. First, we examine the bias of using the method of the first-order approximation to estimate the additive and time jitter noises, and present a procedure to adjust for the bias in the estimates. We then study the bias and variance of a least-squares timebase distortion estimate that uses multiple sets of waveforms. Based on simulations, a method for calculating the uncertainty of the timebase distortion estimate is proposed. We also study the effects of amplitude and phase drifts, as well as jitter error on the estimation of timebase distortion. Results are shown using simulations with parameters that are closely related to those we observe in our laboratory
Keywords :
curve fitting; digital simulation; electron device noise; least squares approximations; measurement uncertainty; oscilloscopes; signal sampling; timing jitter; amplitude drifts; curve fitting; first-order approximation; harmonic distortion; high-speed sampling oscilloscopes; jitter error; least squares methods; least-squares timebase; mean square error methods; phase drifts; time jitter noises; timebase; timebase distortion; timebase distortion estimate; timing jitter; uncertainty; variance; Additive noise; Amplitude estimation; Estimation error; Jitter; Laboratories; Oscilloscopes; Phase distortion; Phase estimation; Sampling methods; Uncertainty;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
