Power Amplifier Phase-Shift Control for Discrete Supply Voltages

The patent applies preliminary action by pre-shifting the phase of the input signal before it enters the power amplifier circuit. The phase shift amount is calculated in advance based on the instantaneous power level, and this pre-adjusted signal is then amplified. This preliminary phase correction compensates for the nonlinear phase distortion that will occur during amplification, thereby reducing overall nonlinear distortion more effectively than digital pre-distortion alone.

The patent changes the phase parameter of the input signal dynamically based on the power level. A phase shift amount calculation unit computes the required phase shift according to the instantaneous power, and a phase shift unit applies this variable phase shift. This parameter change approach allows the system to adapt to different operating conditions and compensate for nonlinear distortion across multiple discrete voltage levels.

The system performs preliminary phase shift adjustment before the signal enters the power amplifier circuit operating with multiple discrete voltage levels. By pre-calculating and applying the appropriate phase shift based on the power level, the system compensates for the nonlinear phase distortion that will be generated during efficient amplification, thus maintaining both high power-added efficiency and low nonlinear distortion.

The patent implements a feedback mechanism where the instantaneous power level is detected and used to determine the appropriate phase shift amount. This feedback loop allows the system to continuously adjust the phase shift according to the current operating state, ensuring that nonlinear distortion is compensated while maintaining efficient operation at multiple discrete power levels.