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:
Jan. 18, 2011
Filed:
May. 30, 2007
Satoshi Tanaka, Kokubunji, JP;
Yukinori Akamine, Kokubunji, JP;
Satoshi Tanaka, Kokubunji, JP;
Yukinori Akamine, Kokubunji, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
In conventional polar-loop transmitter circuits, using two feedback circuits intended to control the amplitude in an open loop and phase of a power output in closed loop, respectively, during transmission, causes current consumption to increase during delivery of a small power output. Therefore, a complex table has to be prepared in order to correct the nonlinearities in the amplitude-to-amplitude characteristic of the power amplifier and the amplitude-to-phase characteristic thereof. In order to reduce the current consumption required for the delivery of a moderate or small power output, a polar-loop transmitter circuit in which two feedback circuits intended to control the amplitude and phase of the power output respectively are active when the power amplifier delivers a large power output exhibiting strong nonlinearity, and when the power amplifier delivers a moderate or small power output, the amplitude of the power output is controlled in the open loop.