Power-measured pulses for thermal trimming

Details Power-measured pulses for thermal trimming Power-measured pulses for thermal trimming

2011-06-07

2011-06-07

Lee, Kyung (Department: 2833)

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

C338S048000, C338S320000, C029S610100

Reexamination Certificate

active

07956717

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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International Search Report dated Apr. 23, 2007 from the International Application PCT/CA2007/000139.
Feldbaumer et al., “Pulse Current Trimming of Polysilicon Resistors”, Transactions on electron devices, IEEE, vol. 42, No. 4, Apr. 1995.

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