A transmitter comprising: • an envelope generator configured to receive a data signal to be transmitted, generate an envelope signal based on the received data signal and output the envelope signal to a pulse width modulation, PWM, generator; • a sense circuit configured to sense and generate a sense signal representative of a first supply voltage, and output the sense signal to a multiplexer; • the multiplexer configured to receive the sense signal and a boost signal representative of a second supply voltage, and selectively output the sense signal or the boost signal to the PWM generator based on an envelope tracking, ET, modulator boost enable signal received by the multiplexer, wherein the second supply voltage is greater than the first supply voltage and the ET modulator boost enable signal indicates either an enabling or a disabling of the boost signal; • the PWM generator configured to generate a PWM signal based on the envelope signal and based on either the received sense signal or the boost signal, and output the PWM signal to an envelope tracking, ET, modulator; • the ET modulator configured to receive the PWM signal, o and in case the ET modulator boost enable signal indicates the disabling of the boost signal: receive the first supply voltage, modulate the first supply voltage according to the PWM signal, thereby arriving at a modulated first supply voltage, and output the modulated first supply voltage to a power amplifier, PA,; ∘ in case the ET modulator boost enable signal indicates the enabling of the boost signal: receive the second supply voltage, modulate the second supply voltage according to the PWM signal, thereby arriving at a modulated second supply voltage, and output the modulated second supply voltage to the PA, • wherein the transmitter further comprises: an ET boost mode controller configured to generate the ET modulator boost enable signal if a magnitude of the envelope signal is greater than a predetermined value. • an envelope generator configured to receive a data signal to be transmitted, generate an envelope signal based on the received data signal and output the envelope signal to a pulse width modulation, PWM, generator; • a sense circuit configured to sense and generate a sense signal representative of a first supply voltage, and output the sense signal to a multiplexer; • the multiplexer configured to receive the sense signal and a boost signal representative of a second supply voltage, and selectively output the sense signal or the boost signal to the PWM generator based on an envelope tracking, ET, modulator boost enable signal received by the multiplexer, wherein the second supply voltage is greater than the first supply voltage and the ET modulator boost enable signal indicates either an enabling or a disabling of the boost signal; • the PWM generator configured to generate a PWM signal based on the envelope signal and based on either the received sense signal or the boost signal, and output the PWM signal to an envelope tracking, ET, modulator; • the ET modulator configured to receive the PWM signal, o and in case the ET modulator boost enable signal indicates the disabling of the boost signal: receive the first supply voltage, modulate the first supply voltage according to the PWM signal, thereby arriving at a modulated first supply voltage, and output the modulated first supply voltage to a power amplifier, PA,; ∘ in case the ET modulator boost enable signal indicates the enabling of the boost signal: receive the second supply voltage, modulate the second supply voltage according to the PWM signal, thereby arriving at a modulated second supply voltage, and output the modulated second supply voltage to the PA, o and in case the ET modulator boost enable signal indicates the disabling of the boost signal: receive the first supply voltage, modulate the first supply voltage according to the PWM signal, thereby arriving at a modulated first supply voltage, and output the modulated first supply voltage to a power amplifier, PA,; ∘ in case the ET modulator boost enable signal indicates the enabling of the boost signal: receive the second supply voltage, modulate the second supply voltage according to the PWM signal, thereby arriving at a modulated second supply voltage, and output the modulated second supply voltage to the PA, • wherein the transmitter further comprises: an ET boost mode controller configured to generate the ET modulator boost enable signal if a magnitude of the envelope signal is greater than a predetermined value.