Dynamic gain and phase compensation for power amplifier load switching

In a radio frequency (RF) transmitter having a closed loop transmit power control system and having at least one RF/Intermediate Frequency (IF) analog stage in a transmit feedforward signal path having a transmit signal, a method for phase compensation during load switching of the at least one RF/IF analog stage, the method comprising the steps of:

• monitoring transmit power on a feedback path of the closed loop transmit power control system;
• determining load switching of the at least one RF/IF analog stage in response to the transmit power;
• and
• digitally phase compensating the transmit signal in response to determining load switching of the at least one RF/IF analog stage.

A radio frequency (RF) transmitter having a transmitter signal path for modulating a signal to generate a transmitted signal following an RF or intermediate frequency (IF) power control stage, the RF transmitter comprising:

• at least one power amplifier (PA) located in the transmitter signal path for providing the transmitted signal therefrom, the transmitted signal having a signal power associated therewith;
• an RF power detector coupled to the at least one PA for detecting the signal power of the transmitted signal;
• an analog to digital (A/D) converter coupled to the RF power detector;. moving average filter coupled to the A/D converter;
• a hysteresis unit coupled to the moving average filter;
• and
• a load switch control unit coupled to the hysteresis unit and the at least one power amplifier for providing load switching of the at least one power amplifier