Method of calibrating a slicer in a receiver or the like
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United States of America Patent
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Aug 4, 2015
Grant Date -
Mar 26, 2015
app pub date -
Sep 25, 2013
filing date -
Sep 25, 2013
priority date (Note) -
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Abstract
A method of calibrating data slicer-latches in a receiver to remove offset errors in the slicer-latches. A known voltage is applied to all but one of the inputs of the slicer-latch. The remaining input receives an offset cancelation voltage from a DAC is stepped upward from a minimum voltage until the slicer-latch output transitions by incrementing a codeword to the DAC and the codeword that resulted the transition is saved. Then the offset cancelation voltage is swept downward in steps from a maximum voltage until the slicer-latch output transitions and the codeword that caused the transition is averaged with the stored codeword. The average of the codewords is applied to the DAC to generate the offset cancelation voltage used during normal operation of the receiver.
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