Modified Doherty Power Amplifier with Hybrid Current-Voltage Amplification for High-Efficiency Broadband Applications

There is an urgent need to improve the performance of power amplifiers in modern communication system applications in terms of linearity, efficiency, and output power to ensure performance that meets the requirements of these applications. This research contributed to developing a switched-mode hybrid amplifier that simultaneously combines current and voltage amplification by modifying both the main and auxiliary amplifiers in the Doherty power amplifier, merging their output power through a load modulation network, and applying this combined power to the load. The characteristics of the hybrid amplifier enable an increase in efficiency and gain and an enhancement in output power, while the load modulation network achieves an ideal matching that contributes to improving the linearity of the amplifier. The suggested amplifier was modeled with the ADS simulation program. The simulation results at a frequency of 850 MHz were an output power of 38 dBm, a power-added efficiency of 71.3%, a dynamic range of 12 dB, and a power gain of 23 dB in the single-tone test. As for the results of the amplifier test for a two-tone signal with a bandwidth of 100 MHz, the output power was 29.5 dBm, the additional power efficiency was 30%, and the power gain was 17 dB. The results indicate that the suggested power amplifier is appropriate for implementation in fifth-generation communication system transmitters.