Title :
Improved time-base for waveform parameter estimation
Author :
Waltrip, Bryan C. ; Laug, Owen B. ; Stenbakken, Gerard N.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
Abstract :
An improved gated-oscillator time-base and associated auto-calibration algorithm for use in a high-accuracy sampling waveform acquisition system are described. The time-base architecture consists of a stable 100 MHz gated-oscillator, 24-bit counter chain, and a clock period interpolator. The nominal, uncorrected linearity of the time-base is approximately ∀30 ps. By using an iterative, sine-fit based algorithm, the linearity has been improved to <∀5 ps. Details of the performance and major sources of error of the time-base and correction algorithm in an equivalent time sampling system are also discussed
Keywords :
calibration; clocks; computerised instrumentation; error compensation; interpolation; iterative methods; measurement errors; measurement standards; parameter estimation; time bases; waveform analysis; 100 MHz; 100 MHz gated-oscillator; 24-bit counter chain; 30 ps; 5 ps; auto-calibration algorithm; clock period interpolator; correction algorithm; equivalent time sampling system; error; iterative sine-fit based algorithm; sampling waveform acquisition; time-base architecture; uncorrected linearity; waveform parameter estimation; Clocks; Delay; Distortion measurement; Iterative algorithms; Linearity; Oscillators; Parameter estimation; Sampling methods; Timing; Voltage;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-5890-2
DOI :
10.1109/IMTC.2000.848726
