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:
Feb. 17, 2009
Filed:
Jan. 05, 2006
Kenichi Kawakami, Kanagawa, JP;
Kenichi Kawakami, Kanagawa, JP;
NEC Electronics Corporation, Kawasaki, Kanagawa, JP;
Abstract
A driver circuit that prevents amplitude reduction at a high temperature comprises a differential pre-buffer circuitfor performing signal clamping by diodesandeach having a nonlinear voltage-current characteristic with respect to an input signal and a differential output circuitfor amplifying output signals of the differential pre-buffer circuit, for output. The driver circuit further includes a temperature characteristic compensation circuitfor controlling direct currents to be passed through the diodesandbased on a current to be passed through a diodehaving a voltage-current characteristic with the same temperature coefficient as those of the diodesand. A current related to constant currents Iand Iis supplied from the temperature characteristic compensation circuitas a current that cancels the temperature characteristic of a fall in forward voltages of the diodesand