This paper presents a low-loss load-insensitive Doherty power amplifier (DPA) technique. The proposed DPA is insensitive to ohmic load variation by adjusting its supply voltages and input drive of the main and peaking stages in a mirrored approach. Moreover, a low-loss tunable matching network (TMN) is employed to cancel out any reactive part of the load. To validate this technique, a printed circuit board (PCB) based demonstrator consisting of the Doherty PA, a six-port reflectometer, and a tunable shunt resonator have been fabricated. When subjected to a 50 Ω load, at the 1 dB compression point, the DPA delivers an output power of 32.3 dBm with a power gain and peak drain efficiency of 14.6 dB and 61 %, respectively. When the DPA is driven with a pre-distorted 64-QAM 4 MHz signal optimized for the 50 Ω loading condition, it delivers 24.4 dBm at 41 % average drain efficiency, with EVM/ACLR −40.9 dB / −46.9 dBc. Subsequently, when subjected to a 2:1 VSWR over a 0°−360° mismatch trajectory, using the unaltered 50 Ω DPD correction, it is capable of delivering an output power of 24.4 ± 0.1 dBm with a 34–39 % drain efficiency while maintaining an EVM/ACLR better than −32.3 dB / −39.3 dBc for all load conditions.
|Title of host publication||Proceedings of the 52nd European Microwave Conference (EuMC)|
|Number of pages||4|
|Publication status||Published - 2022|
|Event||2022 52nd European Microwave Conference (EuMC) - Milan, Italy|
Duration: 27 Sep 2022 → 29 Sep 2022
|Name||2022 52nd European Microwave Conference, EuMC 2022|
|Conference||2022 52nd European Microwave Conference (EuMC)|
|Period||27/09/22 → 29/09/22|
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Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
- self-healing transmitter
- control circuit
- six-port reflectometers
- tunable matching networks