Compensated impedance calibration circuit
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United States of America Patent
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Jan 12, 2016
Grant Date -
Feb 5, 2015
app pub date -
Oct 21, 2014
filing date -
Jan 2, 2013
priority date (Note) -
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Abstract
Aspects of the invention provide for compensating impedance calibration circuits. In one embodiment, a compensated impedance calibration circuit, includes: a variable resistor network including a tunable resistor and a fixed resistor; and an external resistance network including a target external precision resistor and a parasitic distribution resistance; wherein a resistance of the variable resistor network is proportional to a resistance of the external resistance network, such that a ratio of an output voltage of the variable resistor network to a power supply voltage is constant.
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