Design of an Elementary Microstrip Power Splitter for Antenna Array

Kumari, Chanchala; Chattoraj, Neela

doi:10.1109/ncc52529.2021.9530097

Cited by 2 publications

(1 citation statement)

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“…Previous studies indicate that DPAs have demonstrated impressive efficiency across a broad spectrum of output power levels. Past works used analog and digital control systems for regulating the inputs of the DPA where all the control components were fabricated on the same PCB, which restricts the use of the control system for the other amplifiers [14][15][16][17][18]. Moreover, previous approaches show that either the control system was integrated at the input of a power divider, which limits the control range for two parallel-connected PAs, or two different RF generators were used for the inputs of the parallel branch instead of using a power divider, increasing the chance of error for the mismatch between two signals.…”

Section: Introductionmentioning

confidence: 99%

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

Sah,

Poulton,

Luyen

et al. 2023

Designs

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This study presents a systematic design of an optimized drive signal control system for 2.5 GHz Doherty power amplifiers (DPAs). The designed system enables the analysis of the independent control of the amplitude and phase for the signals between the main and peak amplifiers of the DPA. The independent control of the signal is achieved by incorporating a variable attenuator (VA) and a variable phase shifter (VPS) in each of the two parallel paths of the DPA. This integration allows for driving varying power levels with an arbitrary phase difference between the individual parallel PAs for reduced control complexity and power consumption. The specific VA (Qorvo QPC6614) and VPS (Qorvo QPC2108) components are used for the test system to provide an amplitude attenuation range from 0.5 dB to 31.5 dB and a phase range from 0∘ to 360∘ at the intended operating frequency of 2.5 GHz, offering the benefit of characterizing the behavior of PAs for an extensive range of drive signals to optimize the output performance, such as PAE or the ACLR. For experimental validation, the designed drive signal control system is integrated with GaN PAs (Qorvo QPD0005—DUT) 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. In this manuscript, we analyzed and compared the PAE of the DPA and parallel-connected PA for diverse input signals generated using a designed optimized control system.

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