Balanced RF Power Amplifier for VSWR-Stable 5G Output
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Solution Overview
Problem
Existing radio frequency power amplifiers in mobile communication terminals face challenges in achieving optimal transmission power and efficiency, especially in high-frequency bands like n41, n77, and n79, due to variations in antenna standing wave ratio and the need for improved linearity and bandwidth.
Innovation Solution
A balanced radio frequency power amplifier is designed with a symmetrical balance structure for the main and auxiliary path power amplifiers, utilizing a 3 dB distributed orthogonal coupler for the inter-stage power divider and output power combiner, and incorporating a linear circuit and bias circuit to enhance linearity and broadband signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmission power is increased to meet 5G band requirements, then the transmission power is improved, but the direct current power consumption and heat generation increase
Solution Approach 1:
The power amplifier is divided into two separate amplification paths (first and second amplification units), each handling different signal components. This segmentation allows independent optimization of each path's power consumption characteristics while achieving the required total transmission power, thereby reducing overall DC power consumption efficiency.
Solution Approach 2:
The patent transforms the single power amplifier output into two separate outputs with different impedance transformations. By changing the output parameters (impedance, phase) and using separate matching networks, the system achieves better power efficiency and heat dissipation while maintaining the required transmission power level.
2Power
If the transmission power is increased to meet 5G band requirements, then the transmission power is improved, but the heat generation increases
Solution Approach 1:
The power amplifier is divided into two separate amplification paths (first and second amplification units), each handling different signal components. This segmentation allows independent optimization of each path's power consumption characteristics while achieving the required total transmission power, thereby reducing overall DC power consumption efficiency.
Solution Approach 2:
The patent transforms the single power amplifier output into two separate outputs with different impedance transformations. By changing the output parameters (impedance, phase) and using separate matching networks, the system achieves better power efficiency and heat dissipation while maintaining the required transmission power level.
3Device complexity
If a single power amplifier is used, then the device complexity is reduced, but the bandwidth and linearity under broadband signal are insufficient
Solution Approach 1:
The power amplifier is divided into two separate amplification paths (first and second amplification units), each handling different signal components. This segmentation allows independent optimization of each path's power consumption characteristics while achieving the required total transmission power, thereby reducing overall DC power consumption efficiency.
Solution Approach 2:
The patent introduces a new dimension by adding phase differentiation between two amplification paths. By using quadrature phase shifting (90° phase difference) and separate impedance transformation networks, the system achieves broadband operation and improved linearity without simply increasing the complexity of a single amplifier path.
4Adaptability or versatility
If the antenna standing wave ratio changes with usage scenario, then the adaptability is improved, but the load line and transmission efficiency are affected
Solution Approach 1:
The patent transforms the single power amplifier output into two separate outputs with different impedance transformations. By changing the output parameters (impedance, phase) and using separate matching networks, the system achieves better power efficiency and heat dissipation while maintaining the required transmission power level.
Solution Approach 2:
The patent introduces a new dimension by adding phase differentiation between two amplification paths. By using quadrature phase shifting (90° phase difference) and separate impedance transformation networks, the system achieves broadband operation and improved linearity without simply increasing the complexity of a single amplifier path.
Data Source
AI summary
A balanced radio frequency power amplifier, a front-end module, and a corresponding electronic device. The balanced radio frequency power amplifier comprises a driving-stage power unit (101, 201), an inter-stage power divider (102, 202), a main path power amplifier (103, 203), an auxiliary path power amplifier (104, 204), a first output matching network (A105, A205), a second output matching network (B106, B206), and an output power combiner (107, 207). A symmetrical balance design is used for the main path power amplifier (103, 203) and the auxiliary path power amplifier (104, 204), so that the impact of the change in the antenna voltage standing wave ratio (VSWR) on the transmission power and the transmitting efficiency is overcome to the greatest extent. Moreover, a 3 dB distributed orthogonal coupler is used for the inter-stage power divider (102, 202) and the output power combiner (107, 207).