研究目的
To design a monolithic microwave integrated circuit Doherty power amplifier (DPA) operating at sub-6 GHz for 5G communication applications, optimizing for high efficiency at output power backoff (OPBO) and investigating the DPA nonlinear characteristics using X-parameters.
研究成果
The designed DPA demonstrates high efficiency and output power at sub-6 GHz, suitable for 5G communications. The use of X-parameters provides accurate system-level analysis, showing potential for enhanced performance with DPD.
研究不足
The study is limited to sub-6 GHz applications and does not explore higher frequency bands. The DPA's performance without DPD is also a limitation, as DPD can enhance output power and efficiency.
1：Experimental Design and Method Selection:
The design employs a 0.25-μm gallium nitride high-electron mobility transistor process, focusing on compact impedance inverter and output matching using a transmission line network and shunt capacitors. The size ratio of power cells in the main and auxiliary amplifiers is optimized for high efficiency at OPBO.
2：25-μm gallium nitride high-electron mobility transistor process, focusing on compact impedance inverter and output matching using a transmission line network and shunt capacitors. The size ratio of power cells in the main and auxiliary amplifiers is optimized for high efficiency at OPBO.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The DPA is fabricated using 0.25-μm GaN technology, with measurements taken for output power, efficiency, and nonlinear characteristics.
3：25-μm GaN technology, with measurements taken for output power, efficiency, and nonlinear characteristics.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Includes a 0.25-μm GaN high-electron mobility transistor process, transmission line network, shunt capacitors, and measurement setups for X-parameters and modulated signals.
4：25-μm GaN high-electron mobility transistor process, transmission line network, shunt capacitors, and measurement setups for X-parameters and modulated signals.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The DPA is characterized for small-signal and large-signal performance, including measurements with modulated signals and X-parameters for system-level analysis.
5：Data Analysis Methods:
Analysis includes power-added efficiency, output power, and error vector magnitude measurements, with simulations based on X-parameters to predict performance with digital predistortion (DPD).
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