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. 27, 2005
Filed:
Jun. 18, 2003
Takatoshi Katsura, Hyogo, JP;
Kenji Itoh, Hyogo, JP;
Shinjirou Fukuyama, Hyogo, JP;
Mitsuru Mochizuki, Hyogo, JP;
Hiroaki Nagano, Hyogo, JP;
Yoshinori Matsunami, Hyogo, JP;
Fumio Ishizu, Hyogo, JP;
Ryoji Hayashi, Hyogo, JP;
Takatoshi Katsura, Hyogo, JP;
Kenji Itoh, Hyogo, JP;
Shinjirou Fukuyama, Hyogo, JP;
Mitsuru Mochizuki, Hyogo, JP;
Hiroaki Nagano, Hyogo, JP;
Yoshinori Matsunami, Hyogo, JP;
Fumio Ishizu, Hyogo, JP;
Ryoji Hayashi, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A level of a base band signal at an input side of a variable gain amplification circuit is detected by a logarithmic amplifier having a wide input voltage range at a start of an operation, a control unit then performs a coarse feedforward control on a gain of the variable gain amplifier based on the detected level and finds a level of an output of an A/D converter by a mean square deriving circuit and inputs the resulting signal to the control unit. Then the control unit performs a fine feedback control on the variable gain amplifier based on the detected level.