Doherty power amplifier with asymmetrical drain voltages for enhanced efficiency at 8 dB backed-off output power

Summary form only given, as follows. In this paper, we present a high-efficiency 300 W Doherty power amplifier (DPA) that can improve the efficiency at an 8 dB backoff from its saturated output power (PSAT). To enhance the efficiency, asymmetrical drain voltages are supplied to a carrier amplifier and a peak amplifier in the DPA. Measurement results using a CW signal indicate a drain efficiency (Ed) of 50% at a PSAT of 55 dBm and a Ed of 48% at an 8 dB backoff from PSAT.