Patent ID: 7312684

Claim:
A semiconductor device comprising: a semiconductor substrate; an insulating film formed on the semiconductor substrate; and a thin-film inductor element, which is formed on the insulating film, and which includes a first terminal, a second terminal, and a conductive layer formed into a spiral shape between the first terminal and the second terminal so as to have a plurality of turns and at least one intersection, wherein the conductive layer includes: (i) a first conductive layer formed on the semiconductor substrate, and (ii) a second conductive layer which is formed on the insulating film, connects to the first terminal and the second terminal, intersects the first conductive layer via the insulating film at the intersection, and is electrically connected to the first conductive layer near the intersection, wherein the first conductive layer and the second conductive layer are symmetrically arranged in directions from an intermediate point between the first terminal and the second terminal along a longitudinal direction of the conductive layer to the first terminal and the second terminal, and wherein a ratio of a length from the first terminal to a portion of the second conductive layer which electrically connects to the first conductive layer to a length from the second terminal to a portion which electrically connects to the first conductive layer is set at a value by which a difference between a Q value of the thin-film inductor element viewed from the first terminal and a Q value of the thin-film inductor element viewed from the second terminal is not more than 10%.