A high-efficiency microwave amplifier design routine which optimises the power added efficiency of any class (A, AB, B, C, D, E,. . .) of amplifier is reported. It has the advantage of a reduced variable number, and easy synthesis for input-output circuits. A heterojunction bipolar transistor amplifier at 1 GHz for mobile telephone applications has been optimised using this routine. The simulation result shows 71% of power added efficiency under class C operation.<<ETX>>