A system for monitoring the peak power of a telecommunication signal to be transmitted for the RF power amplification of the telecommunication signal to be transmitted, comprising:
- a RF power amplifier having a RF input, a power supply voltage input and a RF output,
- a digital processing device,
- a digital to RF converter, and
- a dc-dc converter,
- the digital processing device having an input adapted to receive the telecommunication signal to be transmitted as digital data, a first output connected to an input of the digital to RF converter and a second output connected to an input of the dc-dc converter, the digital to RF converter having an output connected to the RF input of the RF power amplifier, the dc-dc converter having an output connected to the power supply voltage input of the RF power amplifier, wherein the output of the dc-dc converter can take a discrete voltage value among N discrete voltage values, N being an integer equal to or greater than 2, the digital processing device comprising, between the input and the first output, a delay element τ and, between the input and the second output, a processing path comprising an envelope tracking control logic adapted to create a continuous envelope tracking control signal from the digital data received at the input of the digital processing device, wherein the processing path further comprises, downstream from the envelope tracking control logic, a logic for driving the dc-dc converter comprising a peak value calculating device and a power supply voltage selecting device, the peak value calculating device being adapted to time window the continuous envelope tracking control signal and to calculate the maximum value of the continuous envelope tracking control signal for each time window, and the power supply voltage selecting device being adapted to control the dc-dc converter so as to impose on the output of the dc-dc converter, from the N discrete voltage values, a discrete supply voltage value equal to or greater than the maximum value of the continuous envelope tracking control signal on the entire corresponding time window, the discrete power supply voltage value being applied for a minimum duration equal to the duration of the time window, the delay element τ being selected such that the RF signal corresponding to digital data of the telecommunication signal to be transmitted at the RF input of the RF power amplifier is synchronized with the envelope tracking-type power supply voltage of the RF signal for the same digital data at the power supply voltage input of the RF power amplifier.