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:
Dec. 09, 2008
Filed:
Feb. 02, 2004
Michitaka Kameyama, Sendai, JP;
Takahiro Hanyu, Sendai, JP;
Hiromitsu Kimura, Kyoto, JP;
Yoshikazu Fujimori, Kyoto, JP;
Takashi Nakamura, Kyoto, JP;
Hidemi Takasu, Kyoto, JP;
Michitaka Kameyama, Sendai, JP;
Takahiro Hanyu, Sendai, JP;
Hiromitsu Kimura, Kyoto, JP;
Yoshikazu Fujimori, Kyoto, JP;
Takashi Nakamura, Kyoto, JP;
Hidemi Takasu, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A logical calculation circuit capable of storing data, and performing logical calculations with high reliability and high speeds are provided. The residual polarized state s' of a load ferroelectric capacitor Cs′ is actively changed so that the residual polarized state s′ of a load ferroelectric capacitor Cs′ is opposite to the residual polarized state s of a storage ferroelectric capacitor Cs. In the case a reference potential is made c=0 in the calculation operation, even if the second data to be calculated x=1 is given to the storage ferroelectric capacitor Cs in the residual polarized state s (the first data to be calculated)=0, the ferroelectric capacitor Cs does not reverse in polarity. Even with combinations other than s=0 and x=1, the ferroelectric capacitor Cs does not reverse in polarity. Difference is great between a potential VA=VA(0) occurring at a coupling node when x=1 is given to the ferroelectric capacitor Cs of s=0 and a potential VA=VA(1) occurring at the coupling node when x=1 is given to the ferroelectric capacitor Cs of s=1.