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:
May. 24, 2005
Filed:
Jun. 09, 2003
Nobuyuki Shimizu, Tokyo, JP;
Nobuyuki Shimizu, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A control circuit includes a plurality of drive current output circuits, a control voltage generating circuit, a first current output circuit, a second current output circuit, a voltage divider and a compensation voltage generating circuit. The voltage divider has one end connected to the control voltage generating circuit and a plurality of nodes each of which connected to the respective drive current output. The drive current output circuit outputs the control voltage to the drive circuits based on a power supply voltage and the control voltage. The compensation voltage generating circuit outputs a compensated voltage based on the difference between the current outputted from the first current output circuit and the current outputted from the second current output circuit. In order to supply the compensation voltage to the other end of the voltage divider, the values of the respective control voltage are equalized.