A power amplifier arrangement (200, 300, 400, 600) for amplifying an input signal to produce an output signal, the power amplifier arrangement comprising: a plurality N of successive amplifier sections (211, 212, 311, 312, 411, 412, 611, 612), wherein N is a positive integer that is greater than or equal to 2; a first input transmission line (221, 321, 421, 621) comprising multiple segments; a first output transmission line (231, 331, 431, 631) comprising multiple segments; wherein each amplifier section of the plurality N of successive amplifier sections comprises one or more first transistors distributed along the first input transmission line (221, 321, 421, 621) and the first output transmission line (231, 331, 431, 631) such that gates of the one or more first transistors are connected to respective segments of the multiple segments of the first input transmission line, drains of the one or more first transistors are connected to respective segments of the multiple segments of the first output transmission line: and wherein each amplifier section of the plurality N of successive amplifier sections is configured to amplify a respective portion of the input signal to produce a respective portion of the output signal, wherein the respective portion of the input signal is one of N portions of the input signal partitioned on an amplitude basis by the plurality N of successive amplifier sections or by digital or analog shaping circuits before being input to each amplifier section of the plurality N of successive amplifier sections; lengths of segments of the multiple segments of the first output transmission line segments are non-equal such that the segments of the multiple segments of the first output transmission line are longer at beginning and end regions of the first output transmission line; and the output signal is produced at an end of the first output transmission line (231, 331, 431, 631) by building up N portions of the output signal from each amplifier section of the plurality N of successive amplifier sections. a plurality N of successive amplifier sections (211, 212, 311, 312, 411, 412, 611, 612), wherein N is a positive integer that is greater than or equal to 2; a first input transmission line (221, 321, 421, 621) comprising multiple segments; a first output transmission line (231, 331, 431, 631) comprising multiple segments; wherein each amplifier section of the plurality N of successive amplifier sections comprises one or more first transistors distributed along the first input transmission line (221, 321, 421, 621) and the first output transmission line (231, 331, 431, 631) such that gates of the one or more first transistors are connected to respective segments of the multiple segments of the first input transmission line, drains of the one or more first transistors are connected to respective segments of the multiple segments of the first output transmission line: and wherein each amplifier section of the plurality N of successive amplifier sections is configured to amplify a respective portion of the input signal to produce a respective portion of the output signal, wherein the respective portion of the input signal is one of N portions of the input signal partitioned on an amplitude basis by the plurality N of successive amplifier sections or by digital or analog shaping circuits before being input to each amplifier section of the plurality N of successive amplifier sections; lengths of segments of the multiple segments of the first output transmission line segments are non-equal such that the segments of the multiple segments of the first output transmission line are longer at beginning and end regions of the first output transmission line; and the output signal is produced at an end of the first output transmission line (231, 331, 431, 631) by building up N portions of the output signal from each amplifier section of the plurality N of successive amplifier sections.