Apparatus and method for adjusting the impedance of an output driver
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United States of America Patent
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Sep 27, 2005
Grant Date -
Jun 17, 2004
app pub date -
Dec 5, 2003
filing date -
Dec 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An output impedance bias compensation system for adjusting output impedance of at least one output including a reference impedance generator, an impedance matching controller, at least one output impedance generator, and a programmable bias controller. The reference impedance generator develops a reference impedance based on a reference value. The impedance matching controller continually adjusts an input of the reference impedance generator to match the reference value within a predetermined tolerance. Each output impedance generator is coupled to a corresponding output and is controlled by an output impedance control input. The programmable bias controller combines a bias amount with the value of the input of the reference impedance generator to provide the output impedance control input. The bias controller is programmable to provide a bias amount to compensate for any process variations between the reference impedance generator and each output impedance generator.
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