Dual thin film precision resistance trimming
First Claim
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1. A trimmable resistance structure, comprising:
- an integrated circuit die having components in a semiconductor substrate;
a resistive structure in the integrated circuit die composed of a material whose resistance is permanently changeable by application of heat thereto;
a dielectric in the integrated circuit die disposed adjacent to the resistive structure;
a heater in the integrated circuit die disposed adjacent to the dielectric, the dielectric being disposed so as to separate the heater from the resistive structure; and
a switch in the integrated circuit die configured to selectively couple the heater to a voltage supply that will cause heat from the heater to heat the resistive structure to cause a permanent change in the resistive structure.
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Abstract
A trimmable resistor for use in an integrated circuit is trimmed using a heater. The heater is selectively coupled to a voltage source. The application of voltage to the heater causes the heater temperature to increase and produce heat. The heat permeates through a thermal separator to the trimmable resistor. The resistance of the trimmable resistor is permanently increased or decreased when the temperature of the resistor is increased to a value within a particular range of temperatures.
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Citations
19 Claims
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1. A trimmable resistance structure, comprising:
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an integrated circuit die having components in a semiconductor substrate; a resistive structure in the integrated circuit die composed of a material whose resistance is permanently changeable by application of heat thereto; a dielectric in the integrated circuit die disposed adjacent to the resistive structure; a heater in the integrated circuit die disposed adjacent to the dielectric, the dielectric being disposed so as to separate the heater from the resistive structure; and a switch in the integrated circuit die configured to selectively couple the heater to a voltage supply that will cause heat from the heater to heat the resistive structure to cause a permanent change in the resistive structure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A resistor trimming method, comprising:
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applying a voltage to a heater in an integrated circuit die through a switch in the integrated circuit die; heating a resistive structure in the integrated circuit die adjacent to the heater; permanently changing the resistance value of the resistive structure during the heating step; and removing the voltage from the heater. - View Dependent Claims (8, 9, 10, 11)
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12. A circuit, comprising:
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an integrated circuit die; an amplifier in the integrated circuit die; a trimmable thin film resistor in the integrated circuit die electrically coupled to the amplifier, a gain of the amplifier being based in part on a resistance of the trimable thin film resistor; a thin film heater in the integrated circuit die thermally coupled to the trimmable thin film resistor; a transistor in the integrated circuit die and electrically coupled to the thin film heater and configured to selectively pass a current through the thin film heater to increase a temperature of the trimable thin film resistor to permanently alter the resistance of the trimable thin film resistor; and a thin film thermal separator disposed between the trimmable thin film resistor and the thin film heater. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification