Excavating
Patent
1991-02-11
1995-01-24
Beausoliel, Jr., Robert W.
Excavating
371 471, 371 48, G06K 504, G11B 500, G06F 1100
Patent
active
053847814
ABSTRACT:
An automatic skew calibration technique for a multi-channel signal source uses a cross-coupled flip-flop calibration circuit and a microprocessor to align the timing of a pair of signals from the multi-channel signal source. The flip-flop calibration circuit indicates which of the pair of signals is leading, and the microprocessor uses the output of the flip-flop calibration circuit to determine in which signal source to adjust the signal delay. The signal source is incrementally delayed by the microprocessor while the microprocessor also observes the output of the flip-flop calibration circuit. When the flip-flop calibration circuit indicates a time interval over which the relative time position of the input signals changes, then the microprocessor determines a calibrated value for the signal delay, completing skew calibration of the multi-channel signal source.
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Beausoliel, Jr. Robert W.
Gray Francis I.
Tektronix Inc.
Tu T.
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