| 摘要 |
An object of the invention is to provide a polar modulation circuit capable of reducing the capacity of data stored in memory and suppressing an increase in the circuit scale related to distortion compensation while assuring the compensation accuracy. The polar modulation circuit according to the invention stores output signal characteristic relative to the control voltage at the steady state after input of the control voltage for a predetermined input amplitude of an input high frequency signal as the basis of distortion compensation of an amplifier separately into an offset storage section 101a which stores data used to add a predetermined DC offset voltage and a coefficient storage section 102 which stores data used for multiplication by a predetermined constant, thus reducing the circuit scale related to distortion compensation while assuring the compensation accuracy.
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