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:
Sep. 20, 2005
Filed:
Nov. 22, 2002
Masatoshi Kokubun, Kawasaki, JP;
Shinya Udo, Kawasaki, JP;
Chikara Tsuchiya, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A differential amplifying circuitincludes a current mirror circuit having first and second current ends to which drains of MOS transistors Mand Mare respectively connected, and a pair of differential MOS transistors Mand Mhaving gates between which a switch SWis connected. A reference potential Vref is applied to the gate of the MOS transistors M. A switch SWis connected between the output VO of an output buffer circuitand the gate of a MOS transistor M, and a switch SWis connected between the output VO and the gate of the MOS transistor M. During the offset-cancel preparation period, the switches SWand SWare on and the switch SWis off. Next, the switches SWto SWare turned over, consequently outputting offset-canceled potential VO.