Patent ID: 6853237
Filing Date: 2005-02-08
Classification: G01K

Abstract:
1. A first degree temperature-coefficient-generating circuit comprising an amplifying circuit that includes: a) an operational amplifier having first and second input terminals and an output terminal; b) a feedback resistor circuit having at least one resistor and coupling said output terminal of the operational amplifier to said first input terminal of the operational amplifier; c) an input resistor circuit having at least one resistor and being directly connected to said first input terminal of the operational amplifier; and an adjusting circuit coupled to the second input terminal and configured to adjust a voltage amplification factor of the amplifying circuit at a reference temperature, wherein: at least one of the feedback resistor circuit and the input resistor circuit includes a plurality of resistors having different value temperature coefficients, and a resistance value of each resistor of the feedback resistor and the input resistor circuits is decided so that the voltage amplification factor of the amplifying circuit changes linearly with a first degree temperature coefficient.