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:
Apr. 08, 2008
Filed:
Aug. 11, 2005
Koji Takekawa, Kasugai, JP;
Koji Takekawa, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An amplification circuit connected with a lowpass filter, which reduces the time required for compensating the amplification characteristic and starting up at turning on the power supply, and a control method thereof are provided. An amplification circuit, which operates in any one of the operation mode of ordinary operation mode MDN and special operation mode MDT, includes an amplifying section, a lowpass filterconnected to the amplifying section, and a lowpass filter setting sectionthat sets a cut-off frequency fc. In the case of an ordinary operation mode MDN, the cut-off frequency is set to an ordinary cut-off frequency fcn in which error in the output signal does not exceed an output allowable error as an allowable error, and in the case other than that, set to the side higher than the ordinary cut-off frequency fcn.