Method and apparatus for maintaining an accurate I/O calibration cell
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United States of America Patent
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Oct 18, 2016
Grant Date -
Sep 3, 2015
app pub date -
Nov 7, 2012
filing date -
Nov 7, 2012
priority date (Note) -
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Abstract
An integrated circuit includes an input/output “I/O” cell arranged to drive an output signal and an activity analysis unit arranged to generate an activity factor based on the output signal. The activity factor represents a switching activity intensity of the I/O cell. The switching activity intensity is associated with an ageing effect of the I/O cell. The circuit further includes a calibration unit arranged to generate a switching pattern signal based on the generated activity factor and an I/O calibration cell arranged to be driven by the switching pattern signal, wherein the switching pattern signal emulates the ageing effect of the I/O cell.
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