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. 10, 2013
Filed:
Jun. 02, 2010
Mikihiro Shimada, Osaka, JP;
Ryo Kitamura, Kanagawa, JP;
Kaoru Ishida, Kanagawa, JP;
Hiroshi Komori, Shiga, JP;
Mikihiro Shimada, Osaka, JP;
Ryo Kitamura, Kanagawa, JP;
Kaoru Ishida, Kanagawa, JP;
Hiroshi Komori, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A transmission circuit according to the present invention includes: an amplitude signal driving section () that generates a control voltage based on an amplitude signal in a high-output mode, and generates a control voltage at a predetermined level and a bias current based on the amplitude signal in a low-output mode; a variable gain adjustment section () that adjusts a power level of the phase signal; and a power amplifier () which amplitude-modulates the phase signal having the adjusted power level on the basis of the control voltage, in the high-output mode, and to a power supply terminal of which the control voltage is supplied and which amplitude-modulates the phase signal having the adjusted power level on the basis of the bias current, in the low-output mode. In a specific region in a low-output region and close to a high-output region, the variable gain adjustment section () adjusts the power level of the phase signal to a predetermined upper-limit level, and the amplitude signal driving section () adjusts a gain of the power amplifier () to obtain a desired output power level.