Patent ID: 7659176
Filing Date: 2010-02-09
Classification: H01L

Abstract:
1. A method of fabricating a resistive element, comprising: providing a design temperature coefficient of resistance for said resistive element; selecting a first material having a first temperature coefficient of resistance and selecting a second material having a second temperature coefficient of resistance; said second temperature coefficient of resistance different from said first temperature coefficient of resistance; forming a first resistor of said resistive element from said first material in a first dielectric layer of an integrated circuit having at least two dielectric layers, each dielectric layer containing metal wires; forming a second resistor of said resistive element from said second material in said first dielectric layer or a second dielectric layer; electrically connecting said first resistor to said second resistor and electrically coupling said first resistor and said second resistor to a voltage source by metal wires in said first or said first and a second dielectric layer, said metal wires having a lower resistance than either of said first or said second resistors; wherein, when said first resistor and second resistor are both in said first dielectric layer, a bottom surface of said second resistor is on a top surface of said first resistor; and selecting said first and said second temperature coefficients of resistance such that a temperature coefficient of resistance of said resistive element matches said design temperature coefficient of resistance.