Power-measured pulses for thermal trimming
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United States of America Patent
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Jun 7, 2011
Grant Date -
Jun 4, 2009
app pub date -
Jan 30, 2007
filing date -
Jan 30, 2006
priority date (Note) -
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Abstract
A circuit for trimming a thermally-trimmable resistor, measuring a temperature coefficient of resistance of the thermally-trimmable resistor, and annealing a thermally-trimmable resistor post-trimming, the circuit comprising: a thermally-isolated area on a substrate housing the thermally-trimmable resistor; heating circuitry for applying a signal to a heating resistor; and a constant-power module adapted to maintain power dissipated in the heating resistor substantially constant over a duration of the signal by varying at least one parameter of the signal as a result of a change in resistance of the heating resistor during the signal.
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