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:
Nov. 14, 2006
Filed:
Mar. 30, 2005
Hideaki Kobayashi, Tokyo, JP;
Hideaki Kobayashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Replica output buffers, having the same input/output characteristic as that of an output buffer, respond to the rise of a TEST signal generated by a test pulse generating circuit and causes an output signal to rise at a through rate according to voltage of an SL_SET signal, and causes an output signal to fall at a through rate according to voltage of a CNT signal. A phase comparing circuit makes a comparison between phases of the signals output from the replica output buffers, and outputs an UP signal or Down signal with a length corresponding to a phase difference to a delay control circuit. The delay control circuit changes the voltage of the CNT signal according to the UP signal and the DOWN signal, and adjusts a through rate at which a signal output from the output buffer falls.