LINC power transmitter

A linear amplification with nonlinear components (LINC) power transmitter, comprising:

• a digital signal processing unit which controls the LINC power transmitter;
• a frequency modulation unit which modulates or converts a digital signal output from the digital signal processing unit into a radio-frequency (RF) signal;
• a signal amplification unit which amplifies the RF signal output from the frequency modulation unit using a gain amplifier and a power amplification module;
• and
• a direct current/direct current (DC/DC) conversion unit which controls bias of the power amplification module,
• wherein the DC/DC conversion unit controls a base bias and/or a collect bias of the power amplification module, and the power amplification module operates in saturation;
• wherein the frequency modulation unit comprises:
• a digital/analog (D/A) converter which receives a digital signal output from the signal component separator and converts the received digital signal into an analog signal;
• a low pass filter which only passes a low frequency signal among analog signals output from the D/A converter;
• a quadrature modulator which quadrature-modulates a signal output from the low pass filter;
• and
• a local oscillator which provides an oscillation signal to operate the quadrature modulator.