Patent ID: 6359460
Filing Date: 2002-03-19
Classification: G01D,G11C

Abstract:
A semiconductor device provided with a read-out circuit, comprising:a measuring resistance group with at least one measuring resistance for converting a physical value to a resistance value; a switching means connected to each said measuring resistance for allowing a desired measuring resistance to be conductive; an integration circuit connected to said measuring resistance group for applying a bias current to said measuring resistance group and integrally accumulating a current which flows through said measuring resistance group; a cancel resistance electrically connected to said measuring resistance group for canceling said bias current which flows through said measuring resistance group; and a correction resistance group comprising a plurality of correction resistance electrically connected to said measuring resistance group for correcting variations in resistance value of each said measuring resistance, so that variation in resistance value of said measuring resistance group is detected on a basis of a current accumulated in said integration circuit, a first bias circuit being electrically connected to said measuring resistance group and being provided with a reference resistance equal in resistance temperature coefficient to said measuring resistance; a second bias circuit being electrically connected to said cancel resistance group and being provided with another reference resistance equal in resistance temperature coefficient to said cancel resistance; and a third bias circuit being electrically connected to said correction resistance group and being provided with still another reference resistance equal in resistance temperature coefficient to said correction resistance; wherein said first bias circuit comprises means for applying its output voltage to said measuring resistance group, said second bias circuit comprises means for applying its output voltage to said cancel resistance, and said third bias circuit comprises means for applying its output voltage to said correction resistance.