Patent ID: 6163210
Filing Date: 2000-12-19
Classification: H03F

Abstract:
A feed-forward amplifier apparatus comprising:an error detection part including a signal divider for dividing an input signal into two divided input signals, a first level-and-phase adjusting circuit for adjusting a level and a phase of one divided input signal, a main amplifier for amplifying an output of said first level-and-phase adjusting circuit and a first combining circuit for combining an output of said main amplifier and the other divided input signal to extract a distortion component generated in said main amplifier,an error elimination part including a second level-and-phase adjusting circuit for adjusting a level and a phase of said distortion component, an auxiliary amplifier for amplifying an output of said second level-and-phase adjusting circuit and a second combining circuit for combining an output of said auxiliary amplifier and the output of said main amplifier to deliver a resultant compensated output signal,a first control means for controlling said first level-and-phase adjusting circuit such that said distortion component is minimized, anda second control means for controlling said second level-and-phase adjusting circuit such that a predetermined signal component contained in said resultant compensated output signal is minimized, wherein said first control means includes a first temperature sensor for sensing a corresponding temperature of said main amplifier, said second control means includes a second temperature sensor for sensing a corresponding temperature of said auxiliary amplifier, said first control means performs control of said first level-and-phase adjusting circuit with controlling values preset by a sensed corresponding temperature of said main amplifier at a start-up of said feed-forward amplifier apparatus and said second control means performs control of said second level-and-phase adjusting circuit with controlling values present by a sensed corresponding temperature of auxiliary main amplifier at a start-up of said feed-forward amplifier apparatus.