Patent ID: 7956672
Filing Date: 2011-06-07
Classification: G05F

Abstract:
1. A reference voltage generating circuit comprising: a resistance dividing circuit comprising a plurality of resistors that are connected in series, the plurality of resistors being formed of a metal thin film, each of the plurality of resistors comprising a wiring pattern, an insulating film and a refractory metal film, wherein the wiring pattern is arranged below the metal thin film, the insulating film is arranged between the metal thin film and the wiring pattern, and comprises connecting holes at locations which correspond to connecting portions of the wiring pattern, each of the connecting holes having a top and a bottom, the metal thin film is ohmically connected to the connecting portions of the wiring pattern via the connecting holes, the refractory metal film is interposed between the metal thin film and the connecting portions of the wiring pattern, and the metal thin film extends through the connecting holes from the tops of the connecting holes to the bottoms of the connecting holes, such that the metal thin film is coupled to the wiring pattern via the connecting holes in the insulating film.