An Optimized Control System for the Independent Control of the Inputs of Doherty Power Amplifier

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This thesis presents an optimized drive signal control system for a 2.5 GHz Doherty power amplifier (PA). The designed system enables independent control of the amplitudes and phases of the drive signals fed to the inputs of two parallel PAs. This control system is demonstrated here for Doherty PA architecture with a combiner network which is used as an impedance inversion between the path of two parallel connected PAs. Independent control of the inputs is achieved by incorporating a variable attenuator (VA) and a variable phase shifter (VPS) in each of the two parallel paths. Integrating VA and VPS allows … continued below

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Sah, Pallav Kumar December 2022.

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  • Sah, Pallav Kumar

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This thesis presents an optimized drive signal control system for a 2.5 GHz Doherty power amplifier (PA). The designed system enables independent control of the amplitudes and phases of the drive signals fed to the inputs of two parallel PAs. This control system is demonstrated here for Doherty PA architecture with a combiner network which is used as an impedance inversion between the path of two parallel connected PAs. Independent control of the inputs is achieved by incorporating a variable attenuator (VA) and a variable phase shifter (VPS) in each of the two parallel paths. Integrating VA and VPS allows driving varying power levels with an arbitrary phase difference between the individual parallel PAs. A Combiner network consists of a quarter-wave transmission line at the output of the main power amplifier, which is used to invert the impedance between the main and peaking transistor. The specific VA (Qorvo QPC6614) and VPS (Qorvo QPC2108) components that are used for the test system provide an amplitude attenuation range from 0.5 dB to 31.5 dB with a step size of 0.5 dB and a phase range from 0◦ to 360◦ for a step size of 5.6◦at the intended operating frequency of 2.5 GHz, offering the benefit of characterizing the behavior of PAs under test for an extensive range of drive signals to optimize the output performance such as power added efficiency (PAE) or adjacent channel leakage ratio (ACLR). For demonstration, the designed drive signal control system is integrated with two parallel GaN transistor-based PAs (Qorvo QPD0005) with a P1dB of 37.7 dBm. Each PA is preceded by a drive amplifier with a gain of 17.8 dB to boost the power fed into the PA. The control system incorporates various custom-designed components such as a 20 dB directional coupler, a 3 dB Wilkinson power splitter, a quarter-wave transmission line, and a Doherty power combiner. While Qorvo QPD0005 (DUT) is used as a specific test case in this demonstration, the proposed system can characterize the behavior of a wide range of Doherty PAs.

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  • December 2022

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  • Feb. 9, 2023, 4:59 p.m.

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  • Feb. 13, 2023, 9:10 a.m.

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Thumbnail image of item number 1 in: 'An Optimized Control System for the Independent Control of the Inputs of Doherty Power Amplifier'.
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Sah, Pallav Kumar. An Optimized Control System for the Independent Control of the Inputs of Doherty Power Amplifier, thesis, December 2022; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2048619/: accessed June 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .

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