Power amplifier for amplification of an input signal into an output signal

A radio network node comprising:

• a power amplifier comprising a first and a second sub-amplifier for amplification of an input signal into an output signal, wherein the first and second sub-amplifiers are connected to an input network for receiving the input signal at an input port of the input network, and the first and second sub-amplifiers are connected to an output network for providing the output signal at an output port of the output network, wherein the output network comprises a first transmission line and a second transmission line connected to the first sub-amplifier and the second sub-amplifier, respectively, wherein a difference in electrical length between the first and second transmission lines is an integer number of quarter-wavelengths of a center frequency of the power amplifier, wherein the power amplifier is characterized by further comprising:
• a third sub-amplifier for amplification of the input signal into the output signal, wherein the third sub-amplifier is connected to the input network and the output network, wherein the output network further comprises a third transmission line connected to the third sub-amplifier, wherein a first electrical length includes the first transmission line, a second electrical length includes the second transmission line, and a third electrical length includes the third transmission line, and wherein a longest one of the first, second and third electrical lengths is at least a multiple of quarter-wavelengths of the center frequency.

A user equipment comprising:

• a power amplifier comprising a first and a second sub-amplifier for amplification of an input signal into an output signal, wherein the first and second sub-amplifiers are connected to an input network for receiving the input signal at an input port of the input network, and the first and second sub-amplifiers are connected to an output network for providing the output signal at an output port of the output network, wherein the output network comprises a first transmission line and a second transmission line connected to the first sub-amplifier and the second sub-amplifier, respectively, wherein a difference in electrical length between the first and second transmission lines is an integer number of quarter-wavelengths of a center frequency of the power amplifier, wherein the power amplifier is characterized by further comprising:
• a third sub-amplifier for amplification of the input signal into the output signal, wherein the third sub-amplifier is connected to the input network and the output network, wherein the output network further comprises a third transmission line connected to the third sub-amplifier, wherein a first electrical length includes the first transmission line, a second electrical length includes the second transmission line, and a third electrical length includes the third transmission line, and wherein a longest one of the first, second and third electrical lengths is at least a multiple of quarter-wavelengths of the center frequency.