| 摘要 |
PURPOSE:To obtain a temperature compensating circuit in which the replacement, the trimming operation and the like of a circuit component are not required with reference to an analog input signal provided with temperature dependence, in which the scale of a circuit constitution does not become large and in which an adjusting or setting operation can be performed easily. CONSTITUTION:A temperature compensating circuit is constituted of one pair of inverting amplifier circuits 20, 30 and of a voltage-dividing circuit 40. An analog signal Vin whose level is changed so as to depend on a temperature is input to an input terminal 10. The first inverting amplifier circuit 20 is constituted of an operational amplifier 22, of an input resistance 24 composed of a fixed resistance and of a feedback resistance 26 which is composed of a resistance whose polarity is opposite to the temperature coefficient of the input signal Vin, e.g. a PTC or NTC thermistor. The second inverting amplifier circuit 30 is constituted of an operational amplifier 32, of an input resistance 34 composed of a fixed resistance and of a feedback resistance 36 composed of a fixed resistance. A voltage dividing ratio in the voltage dividing circuit 40 is decided according to the temperature characteristic of output voltages of the first and second inverting amplifier circuits. |
