Amplifier circuit arrangement and electronic device

An amplifier circuit arrangement for amplifying at least one input signal to an output signal for delivery to a load, the amplifier circuit arrangement comprising:

• at least one four-port hybrid coupler,
• a main amplifier having an input terminal for receiving a first input signal and being coupled to a first port of the hybrid coupler,
• an auxiliary amplifier having an input terminal for receiving a second input signal and being coupled to the second port of the hybrid coupler,
• a negative resistance amplifier circuit being coupled to the third port of the hybrid coupler and having a reflection coefficient greater than or equal to 1, wherein the negative resistance amplifier circuit is configured to receive a signal from the hybrid coupler via the third port and to return an amplified signal thereof back to the third port of the hybrid coupler,
• wherein at least one of the auxiliary amplifier and the negative resistance amplifier circuit being selectively operable to operate in combination with the main amplifier circuit.