Patent ID: 6252395
Filing Date: 2001-06-26
Classification: G01D,G01R

Abstract:
An amplification circuit comprising:an operational amplifier for inputting a sensing signal from a temperature-dependent element;a gain-determining input resistor connected to an input terminal of said operational amplifier; anda gain-determining feedback resistor disposed in a feedback path extending from an output terminal of said operational amplifier to the input terminal of said operational amplifier;wherein temperature characteristics of said gain-determining input resistor and said gain-determining feedback resistor are opposed to that of said temperature-dependent element, and the gain of said operational amplifier is defined by said gain-determining input resistor and said gain-determining feedback resistor so that temperature characteristics of said gain can cancel the temperature characteristics of said temperature-dependent element, andwherein said gain-determining input resistor and said gain-determining feedback resistor are impurity-diffusion resistive elements.