Fast-switching power management integrated circuit

A wireless communication circuit comprising a power management integrated circuit (PMIC) comprising:

• a voltage output that outputs an average power tracking (APT) voltage for amplifying a radio frequency, RF, signal modulated in a plurality of modulation units each comprising a plurality of time intervals;
• an offset circuit coupled to the voltage output and configured to change the APT voltage from a present voltage level in a present time interval among the plurality of time intervals to a future voltage level in an upcoming time interval among the plurality of time intervals during a transition interval that falls within one of the present time interval and the upcoming time interval;
• and
• a voltage amplifier coupled to an input of the offset circuit, the voltage amplifier is activated at a start of the transition interval and deactivated at an end of the transition interval to generate a modulated voltage at the input of the offset circuit based on an amplifier target voltage determined to cause the modulated voltage to be higher than or equal to a headroom voltage at the end of the transition interval.

A method for fast switching an average power tracking (APT) voltage in a power management integrated circuit (PMIC) comprising:

• outputting the APT voltage for amplifying a radio frequency (RF) signal modulated in a plurality of modulation units each comprising a plurality of time intervals;
• changing the APT voltage from a present voltage level in a present time interval among the plurality of time intervals to a future voltage level in an upcoming time interval among the plurality of time intervals during a transition interval that falls within one of the present time interval and the upcoming time interval;
• and
• activating a voltage amplifier at a start of the transition interval and deactivating the voltage amplifier at an end of the transition interval to generate a modulated voltage based on an amplifier target voltage determined to cause the modulated voltage to be higher than or equal to a headroom voltage at the end of the transition interval.