Amplification Circuit Having Optimization of Power

Power amplifier circuit comprising an input, an output comprising:

• means for sensing the input voltage;
• a set of n cascode circuits, each comprising a first transistor having a gate, a source and a drain terminal and further comprising a second transistor having gate, source and drain terminal;
• the source and gate of the first transistor of said cascode circuits being respectively connected to a first reference voltage and to receive the input signal, the drain of said first transistor being connected to the source of said second transistor, the drain of which being coupled to said output;
• a control circuit receiving the input voltage sensed by said sensing means for generating a set of control signals which are transmitted to the gates of the second transistors of said n cascode circuits;
• so as to activate or deactivate some of said n cascode circuits and adapt the size of the transistors to the output power to issue to a load.