| 摘要 |
PURPOSE: A linear amplifier using feed forward linearization circuit is provided to effectively eliminate noises of radio frequency signals by performing a power amplification operation to radio frequency signals using a feed forward linearization circuit. CONSTITUTION: A splitter(10) acts to split radio frequency signals received and input form a mobile station. A power amplifier(20) makes each of radio frequency signals splitted by the splitter to be amplified into high power signals using first through fourth power amplifiers. A combiner(30) synthesizes each of radio frequency signals amplified by the first through fourth power amplifiers within the power amplifier. A feed forward linearization circuit(40) eliminates noises, such as an inter modulation distortion component generating when amplifying the radio frequency signals into the high power signals, a spurious and the like, and noises of inter modulation distortion component generating when passing through the combiner, by means of a feed forward linearization operation such as a delay, a phase inversion, a gain control and the like with respect to the radio frequency signals output from the combiner and input into the splitter.
|
