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. 23, 2008
Filed:
Nov. 29, 2004
Atsushi Yoshizawa, Kanagawa, JP;
Masahisa Tamura, Kanagawa, JP;
Atsushi Yoshizawa, Kanagawa, JP;
Masahisa Tamura, Kanagawa, JP;
Sony Ericsson Mobile Communications Japan, Inc., Tokyo, JP;
Abstract
In order to avoid disappearance of output symbols in accompaniment with DC voltage fluctuations occurring at the timing of switching gain in receiving systems for mobile telephones or the like compatible with W-CDMA systems, the present invention provides a variable gain amplifier circuit, a gain control circuit and a mobile communication terminal apparatus, in which a PGA section is comprised of PGAs having different amplification widths continuously arranged in plural stages as in, two coarse adjustment PGAs, a fine adjustment PGA and a coarse adjustment PGA from the input side to the output side; and a gain control circuit has a memory storing a history of gain control with regard to the PGA section and a logic circuit individually controlling gain of each PGA.