| 摘要 |
PROBLEM TO BE SOLVED: To relatively easily reduce distortion made by processing circuits by obtaining information used to correct the distortion separated by a 1st circuit from a sideband wave of a signal appearing in the output of the system. SOLUTION: The processing circuits 130A to 130H and the 1st circuit 108 are, for instance a high frequency electric amplifier, the distortion by the circuit 108 is separated by a loop 1 at the point A, and the separated distortion is corrected on the basis of information retrieved from the sideband wave of a signal that is sent to a loop 2 and supplied to the processing circuits. When the corrected and separated distortion is supplied to the circuits 130A to 130H, the distortion is reduced so as to be negated by distortion of the processing circuits. A scanning circuit used to obtain information on the distortion by the circuits 130A to 130H is provided with a voltage controlled oscillator 144 connected to sweep receivers 146 and 138, and further, the scanning circuit is provided with log amplifiers 148 and 140, a signal detection device 150 and a timer integrating device 142.
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