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. 07, 2010
Filed:
Mar. 26, 2008
Atsuo Inoue, Kyoto, JP;
Noriaki Matsuno, Hyogo, JP;
Atsuo Inoue, Kyoto, JP;
Noriaki Matsuno, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is a reference current circuit able to reduce temperature dependence of the reference current even in a case of using a resistor with extremely low temperature-dependent resistance. The reference current circuit comprises a non-inverting amplifier circuitreceiving a temperature-compensated reference voltage Vand generating a voltage Vat an output point; a current source circuitcomposed of a transistor Qconnected to the output point via a resistor and a transistor Qreceiving a voltage equal to a voltage Vgenerated across terminals of Qand generating a corresponding current. The circuit(i) includes a third transistor Q, a voltage Vgenerated across terminals of which has the same temperature characteristic as the voltage V, and (ii) is configured such that Vis a sum of (a) a temperature-compensated voltage component based on Vand (b) a voltage component equal-to-the voltage V.