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. 10, 2009
Filed:
Jun. 21, 2007
Koji Kimura, Kanagawa, JP;
Koji Kimura, Kanagawa, JP;
NEC Electronics Corporation, Kawasaki, Kanagawa, JP;
Abstract
In a semiconductor device capable of adjusting an output impedance of a first output impedance adjustable output buffer of an external semiconductor device connectable to the semiconductor device, a second output impedance adjustable output buffer is provided. A comparator compares a first output voltage of a real load circuit including the first output impedance adjustable output buffer with a second output voltage of a replica load circuit including the second output impedance adjustable output buffer. An output impedance control circuit transmits an output signal of the comparator to the external semiconductor device to adjust the output impedance of the first output impedance adjustable output buffer, so that the first output voltage is made equal to the second output voltage.