Patent attributes
A predistortion amplifier for compensating distortion includes an amplifying unit; a power detection unit; a distortion compensation table; a control unit; and a predistortion unit for generating a predistorted signal to be inputted to the amplifying device by performing a predistortion on the amplitude and a phase of the input signal, the predistortion being performed by using the compensation values corresponding to the input level outputted from the power detection unit stored in the distortion compensation table. The predistortion unit includes an offset adder for adding an offset value to an amplitude compensating value, the amplitude compensating value being assigned to the amplitude of the input signal by the compensation values based on the input level, and the offset value being determined regardless of the input level. Further, the control unit includes an offset generator for generating the offset value.
