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:
Aug. 08, 2000
Filed:
Sep. 03, 1998
Fumihiko Kato, Yamagata, JP;
NEC Corportion, , JP;
Abstract
An operational amplifier having an input stage including a differential transistor pair and an output stage receiving an output of the input stage for outputting an output signal having a wide output range. The input stage includes a field effect transistor connected in parallel to a constant current source for the differential transistor pair and having a gate connected to receive a level-shifted signal of an output of the input stage, so that when the output signal of the output stage changes, the field effect transistor is turned on so as to supplying an additional bias current to the differential transistor pair in addition to a bias current supplied by the constant current source, so that the slew rate of the output signal of the output stage is elevated.