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:
Mar. 13, 2001
Filed:
Apr. 28, 1999
Satoshi Eto, Kawasaki, JP;
Masato Matsumiya, Kawasaki, JP;
Masato Takita, Kawasaki, JP;
Toshikazu Nakamura, Kawasaki, JP;
Ayako Kitamoto, Kawasaki, JP;
Kuninori Kawabata, Kawasaki, JP;
Hideki Kanou, Kawasaki, JP;
Masatomo Hasegawa, Kawasaki, JP;
Toru Koga, Kawasaki, JP;
Yuki Ishii, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor integrated circuit producing a given output voltage includes first and second operational amplifiers, and first and second transistors. The first and second operational amplifiers detect a voltage difference between a voltage applied to an input terminal and at least one reference voltage. The first and second transistors are turned ON or turned OFF according to the levels of voltages output from the first and second operational amplifiers. The first operational amplifier receives the output voltage at the input terminal. When the level of the output voltage becomes lower than the reference voltage, the first operational amplifier allows the first transistor to operate so as to raise the output voltage. In contrast, the second operational amplifier receives the output voltage at the input terminal. When the level of the output voltage exceeds the reference voltage, the second operational amplifier allows the second transistor to operate so as to lower the output voltage.