Area-efficient, digital variable resistor with high resolution
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United States of America Patent
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Jul 31, 2007
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N/A
app pub date -
Dec 19, 2005
filing date -
Dec 19, 2005
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Abstract
A system, apparatus and method for providing a digital variable resistor with high resolution and efficient use of substrate area is described. In one embodiment of the invention, a digital variable resistor string comprises a serial array of resistors that is connected to a parallel array of resistors through a switching network. A compensation network is coupled in parallel to the parallel array of resistors in order to compensate for resistance drift caused by non-linear responses of components within the variable resistor. For example, the compensation network may interpolate the digital variable resistor to a preferred resistance value that is within an error margin tolerance.
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