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This paper presents the analysis and design of wideband tri-stage Doherty Power Amplifier (DPA). The DPA is implemented using three 10-W packaged GaN-HEMT devices from CREE. The measured drain efficiency is more than 50% and 45% over the frequency range of 700MHz to 1000MHz at 6dB and 9.54dB output power back off (OPBO) respectively. The peak drain efficiency is better than 60% over this 300 MHz band...
This paper proposes a design scheme for extending the bandwidth of a three-stage Doherty power amplifier (DPA) based on symmetric devices for broadband applications. The proposed bandwidth enhancement scheme provides an optimized solution for the load combiner parameters while operating the auxiliary power amplifier (PA) at lower current values as compared to the main PA at saturation. The proposed...
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