Patent ID: 6999734

Claim:
A nonlinear compensating circuit for compensating nonlinearity of an amplifying means on the occasion of transmission after performing frequency conversion of a plurality of input signals to obtain signals of different frequencies, synthesizing the signals, and amplifying the synthesized signals by the amplifying means, comprising: a plurality of power converting means for calculating power values of the respective input signals; an adding means for calculating a synthetic power value by adding up the power values calculated by the plural power converting means; a determining means for determining whether or not the synthetic power value is more than a predetermined threshold value, and outputting a clip control signal for turning off a clipping operation when the calculated synthetic power value is less than or equal to the threshold value, or outputting a clip control signal for turning on a clipping operation, which includes a coefficient to make the synthetic power value of the plural input signals less than or equal to the threshold value, when the calculated synthetic power value is more than the threshold value; and a plurality of clipping means for performing clipping on/off operation according to the clip control signal obtained from the determining means, which directly output the plural input signals when inputting therein the clip control signal for turning off the clipping operation, or multiply the plural input signals by the coefficient to output the resultant values when inputting therein the clip control signal for turning on the clipping operation.