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. 15, 2011
Filed:
Oct. 13, 2006
Yoji Idei, Tokyo, JP;
Susumu Hatano, Tokyo, JP;
Yoji Nishio, Tokyo, JP;
Seiji Funaba, Tokyo, JP;
Yutaka Uematsu, Tokyo, JP;
Yoji Idei, Tokyo, JP;
Susumu Hatano, Tokyo, JP;
Yoji Nishio, Tokyo, JP;
Seiji Funaba, Tokyo, JP;
Yutaka Uematsu, Tokyo, JP;
Elpida Memory Inc., Tokyo, JP;
Abstract
A semiconductor memory device of the present invention determines a logic level of a signal based on a predetermined reference voltage. And the memory device has an input terminal to which a reference signal having the reference voltage is input, a low-pass filter connected to the input terminal for passing a component of the reference voltage of the reference signal and eliminating undesired high frequency components, and one or more input first-stage circuits to each of which an output of the low-pass filter and a signal having the logic level to be determined are connected. In the memory device, the low-pass filter has predetermined attenuation at least at a frequency of an operating clock.