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:
Dec. 15, 2009
Filed:
Apr. 11, 2008
Danya Sugai, Tokyo, JP;
Naoaki Sugimura, Tokyo, JP;
Danya Sugai, Tokyo, JP;
Naoaki Sugimura, Tokyo, JP;
Oki Semiconductor Co., Ltd., , JP;
Abstract
A reference current circuit includes a differential amplifier amplifying a difference in potential between a reference voltage and a first node and outputting the amplified potential difference to a second node, and adjusting transistors connected between a supply voltage and the first node. The reference current circuit further includes switches provided correspondingly to the adjusting transistors to apply a voltage of the second node to control electrodes of the adjusting transistors in response to control signals that are respectively input to the switches. The reference current circuit further includes a resistance connected between the first node and a common potential, and an output transistor having its conduction state responsive to the voltage of the second node for controlling a current supplied from the supply voltage to a load.