An integrated Doherty amplifier based on a multichip module structure is disclosed. The amplifier comprises an input integrated passive die including a Wilkinson power divider, a phase compensation circuit and input matching circuits for the main and peaking amplifiers based on lumped components, the active GaN HEMT die including the main device, a peaking device and a bondwire inductor connected between the drain terminals of the main and peaking devices, and an output matching network including a two-section matching circuit with low-pass and high-pass matching section operating as an impedance-transforming bandpass filter and a dc-feed power supply circuit based on lumped components and microstrip lines.