Patent ID: 8604589

Claim:
A semiconductor device, comprising: a semiconductor substrate; at least one resistor disposed on the semiconductor substrate, and made of polycrystalline silicon, each of the at least one resistor having a low concentration impurity region and a high concentration impurity region, the low concentration impurity region having a resistance and a resistivity; and a metal portion provided to extend above the at least one resistor so as to cover at least the low concentration impurity region of the at least one resistor, the low concentration impurity region being affected by presence of the metal portion to change its resistivity, wherein an area of the low concentration impurity region of the at least one resistor is modified according to an area of the metal portion such that the low concentration impurity region remains constant in its resistance before and after the change of the resistivity of the low concentration impurity region caused by the metal portion, and wherein the area of the low concentration impurity region after the modification thereof is a linear function of the area of the low concentration impurity region before the modification thereof having a slope which is a ratio of the area of the metal portion to the area of the metal portion adjusted with a value derived from a linear function defined between the resistivity of the low concentration impurity region and the area of the metal portion.