The invention relates to a low cost feed forward RF power amplifier arrangement for amplifying an RF input signal using a main power amplifier operating as a class A/B amplifier. The method and apparatus modify the input signal to the main amplifier to compensate for the distortion added by the main power amplifier. The circuit provides for injecting a delayed version of the input signal, through a fixed gain-phase circuity, at a point whereby the resulting signal is amplified by the error amplifier of the second loop. A digitally controlled processor iteratively modifies various phase and gain controls to adjust the output of the amplifier. Different gain and phase control lines are iteratively updated at different rates. <IMAGE>
申请公布号
FI19992411(A)
申请公布日期
2000.05.10
申请号
FI19990002411
申请日期
1999.11.09
申请人
POWERWAVE TECHNOLOGIES, INC.,,
发明人
POSNER,,RICHARD D.;KIM,,KWANG;GENTZLER,,CHARLES R.;SHIN,,DO B.