FEEDFORWARD AMPLIFIER SYSTEM HAVING MASK DETECTING COMPENSATION

摘要

PURPOSE: A feed forward amplifier system is to reduce an out-of band frequency component of RF amplification input signal. CONSTITUTION: An amplifier system(100) amplifies an input signal inputted through a line(101) and outputs the amplified signal to a line(103). A feedback loop(107) controls a gain and phase of variable gain-phase network according to an out-of band frequency component within the amplified signal. The variable gain-phase network is controlled by a first control signal and a second control signal. An error amplifier connected to the variable gain-phase network amplifies an output of the variable gain-phase network. The feedback loop includes a control system(104) having a component for detecting a position of band width allocated to signal. The input signal includes a CDMA(code division multiplexing access) signal.