An envelope tracking, ET, and average power tracking, APT, modulator comprising: an ET modulator, an APT modulator, and a boost circuit, wherein the ET modulator and the APT modulator are configured to provide power supply voltage to a power amplifier; wherein the APT modulator comprises the boost circuit and an APT switch, and wherein the APT switch is coupled between the boost circuit and a power supply voltage input of the power amplifier via a LC circuit; wherein the boost circuit is configured to receive a first supply voltage (Vbat) and output a second supply voltage (BOOSTED VOLTAGE), wherein the second supply voltage is greater than the first supply voltage, wherein the boost circuit is used to generate the second supply voltage (BOOSTED VOLTAGE) for the ET modulator and to generate a third supply voltage for the APT modulator; wherein the ET modulator comprises first switching circuitry based on PMOS and NMOS transistors connected in series and second switching circuitry based on PMOS and NMOS transistors connected in series, wherein the ET modulator is configured to provide the power supply voltage through an output of the first switching circuitry and the second switching circuitry; wherein a voltage power supply to the first switching circuitry is provided by the first supply voltage (Vbat), a a voltage power supply to the second switching circuitry is provided by the second supply voltage (BOOSTED VOLTAGE); wherein if the ET modulator is operating in a boost mode, the second switching circuitry is active and the first switching circuitry is inactive; and wherein if the ET modulator is operating in a normal mode, the first switching circuitry is active and the second switching circuitry is inactive; wherein the active and inactive states of the first switching circuitry and the second switching circuitry are controlled by an enable signal via a control line; wherein the APT modulator is active if the APT switch is closed and wherein the ET modulator is active if the APT switch is open. an ET modulator, an APT modulator, and a boost circuit, wherein the ET modulator and the APT modulator are configured to provide power supply voltage to a power amplifier; wherein the APT modulator comprises the boost circuit and an APT switch, and wherein the APT switch is coupled between the boost circuit and a power supply voltage input of the power amplifier via a LC circuit; wherein the boost circuit is configured to receive a first supply voltage (Vbat) and output a second supply voltage (BOOSTED VOLTAGE), wherein the second supply voltage is greater than the first supply voltage, wherein the boost circuit is used to generate the second supply voltage (BOOSTED VOLTAGE) for the ET modulator and to generate a third supply voltage for the APT modulator; wherein the ET modulator comprises first switching circuitry based on PMOS and NMOS transistors connected in series and second switching circuitry based on PMOS and NMOS transistors connected in series, wherein the ET modulator is configured to provide the power supply voltage through an output of the first switching circuitry and the second switching circuitry; wherein a voltage power supply to the first switching circuitry is provided by the first supply voltage (Vbat), a a voltage power supply to the second switching circuitry is provided by the second supply voltage (BOOSTED VOLTAGE); wherein if the ET modulator is operating in a boost mode, the second switching circuitry is active and the first switching circuitry is inactive; and wherein if the ET modulator is operating in a normal mode, the first switching circuitry is active and the second switching circuitry is inactive; wherein the active and inactive states of the first switching circuitry and the second switching circuitry are controlled by an enable signal via a control line; wherein the APT modulator is active if the APT switch is closed and wherein the ET modulator is active if the APT switch is open.