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
fDate :
8/1/2001 12:00:00 AM
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; computerised instrumentation; iterative methods; parameter estimation; signal sampling; time bases; waveform analysis; 100 MHz gated oscillator; autocalibration algorithm; clock period interpolator; equivalent time sampling; error sampling; gated oscillator time-base; iterative sine-fit based algorithm; linearity below 5ps; sampling waveform acquisition; time-base architecture; uncorrected linearity; waveform parameter estimation; Clocks; Counting circuits; Distortion measurement; Iterative algorithms; Linearity; NIST; Oscillators; Parameter estimation; Sampling methods; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
