The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2004
Filed:
Apr. 17, 2001
Toshihiro Nakamura, Nara, JP;
Masahiko Monomohshi, Kashihara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a temperature detecting circuit of the present invention, a bias voltage Vin with relatively steep temperature characteristics is supplied to an inverting input terminal of an inverting amplifier via a resistance R , a resistance R is disposed between the inverting input terminal and an output terminal of the inverting amplifier, and an output of the inverting amplifier is supplied to a non-inverting input terminal of a non-inverting amplifier, and an inverting input terminal of the non-inverting amplifier is connected with a source of a reference potential via a resistance R and further connected with an output terminal via a resistance R . Desired temperature characteristics can be obtained by properly setting resistivities of the resistances R and R , while a desired output voltage value can be obtained for the temperature characteristics given by the inverting amplifier by properly setting resistivities of the resistances R and R . This allows temperature detection with relative accuracy between the two bias voltage sources, by the inverting amplifier outputting a voltage according to a difference between two bias voltages Vin and Vbias with different temperature characteristics, enabling the temperature detecting circuit to be adapted to various temperature characteristics and output dynamic range.