Title: Method and device for amplifying an amplitude- and phase-modulated electric signal
Application Number: 200680000296 Application Date: 2006.01.04
Publication Number: 1969454 Publication Date: 2007.05.23
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03F1/02;H03G3/30;H03F3/189
Applicant(s) Name: Siemens AG Address:
Inventor(s) Name: Langer Andreas
Attorney & Agent: shaoya li lixiao shu
Abstract:
    The aim of the invention is to suppress interference caused by a mismatch of the power amplifier (5, 6) of a polar-loop transmitter. To achieve this, the crest factor of the output signal from the power amplifier (5, 6) is measured during operation to detect the state of the mismatch and to identify the modification of the transfer characteristic curve of the power amplifier. The crest factors that have been determined are compared with a target value and if the crest factor deviates from the target value, the bandwidth or the amplification of the amplitude closed loop (2, 4) is adapted accordingly. The transmitter can thus regulate the non-linear distortions that occur as a result of the mismatch. Said measures improve the linear behaviour or degree of efficiency of the power amplifier (5, 6).
Time: 6
<- Previous Patent:Slide operation device   |  Next Patent:Method for protecting hearing by ... ->