| 摘要 |
PROBLEM TO BE SOLVED: To provide a system capable of reducing distortion without a pilot signal. SOLUTION: A feed forward distortion reducing step 64 receives a signal S to be amplified on a main signal route from a splitter 68 and copies it onto routes 72 and 74. The signal S on the route 72 is passed through a gain and phase circuit 75 and an amplifier 62 and becomes an amplified signal S having a distortion D caused by the amplifier 62. A part of these outputs S and D is arranged on a coupling route 76 and coupled with the signal S delayed on the route 74 at a distortion separating point 78 (coupler 80) and the distortion D caused by the amplifier 62 is separated. The output of the cooler 80 is inputted to a gain/phase regulator 88, controlled by a gain/phase control circuit 90 and inputted to an amplifier 96. This output is composed of the amplified signal S and a distortion signal d1 generated by the amplifier 96. A step 64 is designed for canceling the signal D at a coupler 100 and a residual distortion D in an output 86 is reduced.
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