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:
May. 14, 2013
Filed:
May. 19, 2010
Mikihiro Shimada, Osaka, JP;
Kaoru Ishida, Kanagawa, JP;
Hiroshi Komori, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A transmission circuit () according to the present invention includes an RF-IC (), an EM-IC (), and a power amplifier (). The EM-IC () includes a DC-DC converter (), a transistor (), a low-dropout regulator (), and a regulator output selector switch (). After an elapse of a predetermined time from a time when an operation mode of the transmission circuit has switched from a polar modulation mode to a quadrature modulation mode to a time when a power supply voltage for the quadrature modulation mode output from the DC-DC converter () stabilizes at a desired value, the regulator output selector switch () switches a connection destination of a gate of the transistor () to a fixed potential, and outputs as a control voltage the power supply voltage for the quadrature modulation mode output from the DC-DC converter ().