Termination impedance apparatus with calibration circuit and method therefor
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United States of America Patent
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Feb 24, 2015
Grant Date -
Oct 30, 2014
app pub date -
Apr 24, 2013
filing date -
Apr 24, 2013
priority date (Note) -
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Abstract
A termination impedance apparatus includes a variable pull-up resistor, a variable pull-down resistor, and a small-signal calibration circuit. The variable pull-up resistor is coupled between a first power supply voltage terminal and an output terminal. The variable pull-down resistor is coupled between the output terminal and a second power supply voltage terminal. The small-signal calibration circuit is for calibrating the variable pull-up resistor and the variable pull-down resistor to achieve a desired small-signal impedance.
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