On die termination circuit and method for calibrating the same
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United States of America Patent
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Aug 24, 2010
Grant Date -
Nov 20, 2008
app pub date -
May 8, 2008
filing date -
May 14, 2007
priority date (Note) -
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Abstract
On die termination circuit and method for calibrating the same includes a external resistor connected to a first node, a plurality of calibration resistors connected to a second node, the plurality of calibration resistors being turned on/off in response to a calibration code set, a current mirror configured to mirror currents of the first node and the second node and a code generator configured to generate a calibration code set according to the mirrored currents. In accordance with a method for calibrating an on die termination circuit of the present invention, the method includes a step of mirroring a current of a first node connected to an external resistor and a current of a second node connected to a plurality of calibration resistors and a step of generating a calibration code set according to the mirrored currents.
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