Method to find a value within a range using weighted subranges
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United States of America Patent
Stats
-
Apr 8, 2003
Grant Date -
Feb 14, 2002
app pub date -
Aug 14, 2001
filing date -
Aug 25, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of finding an unknown value from within a range of values is disclosed that divides the range into weighted subranges and then, beginning with an arbitrary search value within the range, performs a number of simple comparisons to determine the value for each subrange that will result in a match with the target value. This method can also detect those cases where the target value lies outside the range. In one embodiment, the method of finding an unknown value within a range of values is applied to impedance matching. In this embodiment, the output impedance of a pin on an integrated circuit is automatically matched to the impedance of the load connected to it. The output driver has a controllable impedance that can be adjusted within a specific range of impedances to match the external load impedance it is to drive.
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