Thermal pre-scanning of electric circuits using thermally-trimmable resistors
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United States of America Patent
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Sep 20, 2011
Grant Date -
Dec 31, 2009
app pub date -
Mar 16, 2007
filing date -
Mar 23, 2006
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Abstract
There is described a method to change the value of a thermally-trimmable resistor in a non-permanent way by raising the temperature of the thermally-trimmable resistor to a level that is somewhere between room temperature and trimming temperature. By doing this, the trimming range that is available via true thermal trimming may be explored without actually trimming the value of the resistor. This is possible when the thermally-trimmable resistor, or a portion thereof, has an essentially non-zero temperature coefficient of resistance (TCR).
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