| 摘要 |
PURPOSE: A predistorter of a power amplifier is provided to compensate the degree of gain and changing of the phase according to the condition of the operation of a power amplifier by using an envelop predistorter. CONSTITUTION: A predistorter of a power amplifier includes a signal attenuating portion(1000), a phase shifter(2000), a signal distorter(6000), a vector modulating portion(3000), an amplifying portion(4000), an error detection correcting portion(5000). The signal attenuating portion(1000) distorts and attenuates the appointed input signal with reference to the first control signal input from the outside. The phase shifter(2000) shifts the phase of the signal output from the signal attenuating portion(1000) with reference to the second control signal input from the outside. The signal distorter(6000) outputs the control signal distorting the input signal according to the power of the input signal. The vector modulating portion(3000) generates the signal of the phase output from the phase shifter(2000). The amplifying portion(4000) amplifies the signal output from the vector modulating portion(3000). The error detection correcting portion(5000) outputs the first and second control signals comparing the signal amplified in the amplifying portion(4000) and the input signal and detecting and correcting the error.
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