Patent ID: 7551055

Claim:
A resistor having a uniform resistance, comprising: a first resistor having a first width and a first length and having a negative resistance temperature coefficient; and a second resistor serially connected to the first resistor in the lengthwise direction, the second resistor having a second width and a second length, and having a positive resistance temperature coefficient, wherein a second ratio of the second length to the second width is obtained using Tp, Rp, Ta, Ra and a first ratio of the first length to the first width, where Tp and Ta are respective resistance temperature coefficients of the first and the second resistors, and Rp and Ra are respective sheet resistances of the first and the second resistors, and wherein the second ratio is equal to −(Tp×Rp)/(Ta×Ra) multiplied by the first ratio so that the resistor formed by the first resistor and the second resistor has a uniform resistance, such that, the sum of resistances of the first and second resistors is substantially independent of changes in temperature.