Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1992-10-14
1994-03-08
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324617, 324 7624, 324 7638, 364723, G01R 2902, G11B 2018
Patent
active
052935205
ABSTRACT:
Periods P.sub.k between the one edges of input pulses are measured one after another by a successive period measuring circuit, and at the same time, the time interval between the one edge to the other of each input pulse, that is, a pulse width W.sub.k, is measured by a time interval measuring circuit. The measured periods are sequentially accumulated and each accumulated value is made to correspond to each pulse, as the time at which the measurement of its pulse width was started. In an interpolation part, pulse widths, which are assumed to be obtained at regular time intervals, are computed, by an interpolation method, from the sequence of measured pulse widths and the their measurement starting times. In a Fourier transform part, the pulse width data obtained by the interpolation is subjected to a Fourier transform to obtain the frequency components of a pulse width jitter.
REFERENCES:
patent: 4074358 (1978-02-01), Caputo et al.
patent: 4253184 (1981-02-01), Gitlin
patent: 4800571 (1989-01-01), Konishi
patent: 4876655 (1989-10-01), Carlton
Patent Abstracts of Japan, vol. 12, No. 173 (P-706), May 24, 1993, & JP-A-62-284 268 (Advantest), Dec. 10, 1987, Abstract only.
Patent Abstracts of Japan, vol. 12, No. 188 (P-711), Jun. 2, 1988, & JP-A-62-294 993 (Advantest), Nov. 22, 1987, Abstract only.
Technisches Messen TM, vol. 53, No. 6, 1976, Munchen De, pp. 215-219, Nawrocki et al., "Personal-Computer als Klirrfaktormessgerat" (no month).
Advantest Corporation
Solis Jose M.
Wieder Kenneth A.
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