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:
May. 12, 1998
Filed:
Mar. 04, 1997
Shiro Dosho, Osaka, JP;
Shiro Sakiyama, Osaka, JP;
Masakatsu Maruyama, Osaka, JP;
Masatoshi Matsushita, Kanagawa, JP;
Koji Mochizuki, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A reference voltage output terminal of first and second reference voltage generating circuits is connected to a first current input terminal of a current mirror circuit of an operational amplifier by a diode element. At the time of start-up, a reference voltage generated on the reference voltage output terminal is 0 V. Consequently, a current flows to the diode element and an offset voltage Voff is generated on the operational amplifier so that a malfunction point is caused to disappear. Accordingly, in the case where a normal operation point on which a reference voltage having an expected value is generated and a malfunction point on which an operation is stabilized with a reference voltage having a value less than the expected value are present, the generated reference voltage is raised at the time of start-up, passes through the malfunction point to reach an expected voltage value on the normal operation point and becomes stabilized. In this state, the diode element is cut off so that the offset voltage Voff is caused to disappear.