An electronic device may include wireless circuitry (24) with a processor (26), a transceiver (30), an antenna (42), and a front-end module (40) coupled between the transceiver (30) and the antenna (42). The front-end module (40) may include one or more power amplifiers (50) for amplifying a signal for transmission through the antenna (42). A power amplifier (50) may include multiple amplifier stages. Current sharing or reuse may occur between two amplifier stages (60, 62) in the power amplifier (50) via a current flow path between the two amplifier stages. A power supply voltage line (75) may be connected to the current flow path and may provide the downstream amplifier stage (62) with a supplemental supply current based on which the downstream amplifier stage (62) can amplify a radio-frequency signal received from the upstream amplifier stage (60).