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:
Apr. 11, 2000
Filed:
Jan. 28, 1999
Tsuyoshi Takayama, Shiga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Both the distortion characteristic and the through rate characteristic of an operational amplifier are excellently retained over a wide range of a supply voltage. While an operating current of a differential circuit is controlled by a first current source circuit, an operating current of a level shift circuit is controlled by a second current source circuit. The first current source circuit controls the operating current to be substantially constant against a change of the supply voltage, so that the through rate characteristic of the operational amplifier can be good over a predetermined range of the supply voltage. The second current source circuit controls the operating current so that a difference between the supply voltage and a level shift voltage can be substantially constant against the change of the supply voltage so as not to degrade the distortion characteristic of the operational amplifier over the predetermined range of the supply voltage. As a result, the distortion characteristic and the through rate characteristic of the operational amplifier can be excellently retained over a wide range of the supply voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile