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. 28, 2020
Filed:
Nov. 09, 2017
Ricoh Electronic Devices Co., Ltd., Osaka, JP;
Yohkoh Hirose, Amagasaki, JP;
RICOH ELECTRONIC DEVICES CO., LTD., Osaka, JP;
Abstract
A reference voltage generator circuit is provided with a first voltage generator circuit that generates a first direct-current voltage; a second voltage generator circuit that generates a second direct-current voltage; and an operational amplifier that generates a voltage difference between the first and second direct-current voltages. The reference voltage generator circuit generates a reference voltage based on a band gap by controlling currents flowing in the first and second voltage generator circuits based on the voltage difference, and includes a third voltage generator circuit including a PNP bipolar transistor, which is connected in parallel with the first voltage generator circuit. The third voltage generator circuit generates a third direct-current voltage corresponding to a base current flowing in the PNP bipolar transistor, and applies it to the operational amplifier with the first direct-current voltage.