HIGH-FREQUENCY AMPLIFIER CIRCUIT

A drive stage amplifier circuit including drive stage transistors is arranged on a substrate. A balun that converts a high-frequency signal output from the drive stage amplifier circuit to a differential signal is arranged on the substrate. A power stage differential amplifier circuit that includes power stage transistors and amplifies the differential signal converted by the balun is arranged on the substrate. A drive stage power supply terminal supplies power to the drive stage transistors via the balun. When the substrate is viewed in plan view, a minimum encompassing rectangle that encompasses the power stage transistors is long in a first direction. The balun is arranged within a range of the minimum encompassing rectangle with respect to the first direction. The drive stage power supply terminal and the drive stage transistors are arranged at positions sandwiching the balun in the first direction.