| 摘要 |
PROBLEM TO BE SOLVED: To suppress decline of distortion compensation characteristics low and to attain low power consumption by having a control part stop a distortion compensation operation of a distortion compensation operation part at the time of a transmission signal power that does not need distortion compensation in a transmitter with a predistortion distortion compensation circuit. SOLUTION: In a transmitter with a preemphasis distortion compensation circuit, at the time of power of transmission base band signals I and Q that do not need distortion compensation, control of a control part 113 is made to stop a distortion compensation operation of a distortion compensation operation part 105. In this device, if a power of the transmission signal is not a power value that makes input/output characteristics of an amplifier 118 linear, distortion compensation does not need to be executed. Then, the control part 113 is made to monitor the power value of the transmission signals calculated by the power calculation part 112, the distortion compensation operation is conventionally performed in the case of the power value that needs the distortion compensation, the distortion compensation operation is stopped in the case of the value that does not need the distortion compensation, and the base band signals I and Q are made to be outputted as they are. |
