Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1997-11-10
1998-08-04
Snow, Walter E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 7638, 360 65, 375230, H03H 1328, H03H 701, G01R 3100, G01R 1328
Patent
active
057899134
ABSTRACT:
Equalizers, used for equalizing distorted signals, are calibrated with the aid of the so-called "eye" pattern on the oscilloscope. Data bits are traced with their edges above one another by triggering to the amplitude so that an "eye" opening is produced. The "eye" is wide open and sharply delimited in the case of correct equalization. However, this method does not provide for automatic calibration of the equalizer. In order to automatically calibrate an equalizer in an optimal manner, a Lissajous figure is formed from in each case of two successive samples of the signal to be equalized. A fuzzy logic control loop compares the Lissajous figures generated with a circle in the case of a sine oscillation and with a square in the case of a square wave oscillation. From this comparison, the fuzzy logic control loop derives the parameters for the equalizer. The equalizer is optimally calibrated when a circle or, respectively, a square is formed as Lissajous figure.
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IBM Technical Disclosure Bulletin, vol. 13, No. 6, Nov. 1970, Hoffmann C.R., Eye Opening Detector S.1499-1500; 3-10.
Davenport Francis A.
Deutsche Thomson Brandt GmbH
Snow Walter E.
Tripoli Joseph S.
Wein Frederick A.
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