Differential comparator with skew compensation function and test apparatus using the same
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United States of America Patent
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Aug 2, 2011
Grant Date -
Jun 17, 2010
app pub date -
Dec 17, 2008
filing date -
Dec 17, 2008
priority date (Note) -
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Abstract
One of differential signals is inputted to a first input terminal. The other of the differential signals is inputted to a second input terminal. A first sample hold circuit samples the signal inputted to the first input terminal and hold it thereafter. A second sample hold circuit samples the signal inputted to the second input terminal and holds it thereafter. A comparison unit compares a signal corresponding to a difference between respective output signals from the first and the second sample hold circuits, with a predetermined threshold value. A latch circuit latches an output from the comparison unit. Sample timings of the first and the second sample hold circuits and a latch timing of the latch circuit can be adjusted independently.
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