Patent ID: 6831626
Filing Date: 2004-12-14
Classification: G09G

Abstract:
A temperature detecting circuit comprising:an inverting amplifier for outputting a voltage in accordance with a difference between a first bias voltage from a first bias voltage source with relatively steep temperature characteristics and a second bias voltage from a second bias voltage source with relatively gradual temperature characteristics, the inverting amplifier outputting the voltage in accordance with a difference between the first bias voltage and the second bias voltage so as to perform temperature detection with relative accuracy between the first and the second bias voltage sources; a first resistance for supplying the first bias voltage to an inverting input terminal of the inverting amplifier; a second resistance which is disposed between the inverting input terminal and an output terminal of the inverting amplifier; a non-inverting amplifier having a non-inverting input terminal for receiving the output from the inverting amplifier; a third resistance for supplying a predetermined reference potential to an inverting input terminal of the non-inverting amplifier; and a fourth resistance which is disposed between the inverting input terminal and an output terminal of the non-inverting amplifier, so that the temperature detecting circuit performs temperature detection between at least the first and second bias voltage sources.