INPUT LEVEL CORRECTION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To output an amplified high frequency signal stably while preventing the internal circuit of a power amplification means from being damaged by correcting the input level of a plurality of high frequency signals having different input levels from a plurality of signal sources at the prestage of the power amplification means.

SOLUTION: The input level of high frequency signals having different input levels from a plurality of signal sources 40a-40c is corrected appropriately by a matching circuit (PLD) 118 as a means for changing the amount of attenuation which changes the amount of attenuation of a variable attenuator 112 as an attenuation means in accordance with the amount of attenuation which is obtained by linear approximation of an appropriate input level at a frequency between the lower limit frequency and the upper limit frequency based on the amount of attenuation which is changed in correspondence with the lower limit frequency and the upper limit frequency of the high frequency signal.

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