Broadband doherty power amplifier

A power amplifier circuit for providing an amplified signal, the power amplifier circuit comprising:

• a main amplifier circuit comprising a main amplifier configured to amplify an input signal in one of a full-power mode and at least a back-off mode;
• a first peak amplifier circuit in parallel with the main amplifier circuit, the first peak amplifier circuit comprising a peak amplifier in series with a transmission line, the peak amplifier configured to be activated in the full-power mode and to be de-activated in at least the back-off mode;
• a combining node connected to an output of the main amplifier circuit and an output of the transmission line;
• and
• a matching network connected at the output of the combining node, the matching network being selected to match a combined load of the main amplifier circuit and the peak amplifier circuit in full power mode over a wide frequency band.