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:
Jun. 03, 2014
Filed:
Jun. 22, 2010
Maki Nakamura, Kanagawa, JP;
Maki Nakamura, Kanagawa, JP;
Paansonic Corporation, Osaka, JP;
Abstract
Disclosed is a polar modulation transmission circuit wherein distortion components resulting from variations between individual amplifiers are compensated for with few man-hours, and deterioration in signal quality is effectively suppressed. A frequency converter () converts the frequency of an output signal of a high frequency power amplifier () and outputs a frequency domain signal, and a phase compensation unit () measures the power level, for each delay amount, at a low frequency band and high frequency band wherein the detuning frequency from the frequency domain signal is the same, calculates the 'unlevel amount' (relative level difference) between the power level of the low frequency band and power level of the high frequency band for each delay amount, and determines the compensation characteristics on the basis of the relationship of the unlevel amount (relative level difference) to the delay amount. Then, the phase compensation unit () compensates for the phase signal by adding to the phase signal the phase compensation amount, in the determined compensation characteristics, that corresponds to the amplitude signal.