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:
Oct. 19, 2004
Filed:
Apr. 21, 2003
Katsuyuki Yasukouchi, Kasugai, JP;
Ayuko Watabe, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An operational amplifier for increasing the response speed of its output voltage relative to an input signal while increasing the tolerable amplitude of the output voltage. The operational amplifier includes a PNP output transistor connected to a high potential power supply, an NPN output transistor connected between the PNP output transistor and a low potential power supply, and a drive unit, which drives each output transistor in accordance with an input current. The drive unit includes a current source, a first current mirror circuit, and a second mirror circuit. The input current is supplied to a node between the first and second current mirror circuits. The base of the NPN output transistor is connected to the node, and the base of the PNP output transistor is connected to a further node between the current source and the first current mirror circuit.