Balanced RF Power Amplifier for VSWR-Stable 5G Transmission
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Solution Overview
Problem
The high power consumption and heat generation of radio frequency power amplifiers in 5G communication systems, particularly in bands n41, n77, and n79, due to high transmission power requirements, lead to reduced battery life and efficiency, necessitating improvements in bandwidth, linearity, and efficiency, especially under varying antenna standing wave ratios.
Innovation Solution
A balanced radio frequency power amplifier design incorporating a driving-stage power unit, inter-stage power divider, main and auxiliary path power amplifiers, output matching networks, and an output power combiner, utilizing symmetrical amplifiers and 3 dB distributed orthogonal couplers to optimize performance indicators like bandwidth, insertion loss, and efficiency, with linear and bias circuits to enhance linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high transmission power is used to meet 5G communication requirements in bands n41, n77, and n79, then transmission power is improved, but power consumption and heat generation increase
Solution Approach 1:
The power amplifier is divided into two parallel paths: a main path and an auxiliary path. The main path handles the primary amplification task, while the auxiliary path provides load line optimization and linearity improvement. This segmentation allows the system to achieve high transmission power without proportionally increasing power consumption, as the auxiliary path efficiently manages the load conditions.
Solution Approach 2:
The patent employs variable load line optimization by dynamically adjusting the load conditions in the auxiliary path based on operating conditions. This parameter change approach allows the power amplifier to maintain optimal efficiency across different transmission power levels, reducing overall power consumption while meeting the required transmission power specifications for 5G bands.
2Power
If high transmission power is used to meet 5G communication requirements, then transmission power is improved, but heat generation increases
Solution Approach 1:
By segmenting the amplification function into main and auxiliary paths, the heat generation is distributed across two separate amplification stages rather than concentrated in a single stage. This segmentation allows for better thermal management and reduces peak heat generation, while still achieving the required high transmission power output.
Solution Approach 2:
The variable load line optimization dynamically adjusts operating parameters to maintain optimal efficiency, which directly reduces heat generation. By optimizing the load conditions in real-time, the system minimizes wasted energy that would otherwise be converted to heat, allowing high transmission power to be achieved with reduced thermal output.
3Adaptability or versatility
If antenna standing wave ratio varies with usage scenario, then adaptability is improved, but transmission power and efficiency become unstable
Solution Approach 1:
The auxiliary path functions as a feedback mechanism that continuously monitors and optimizes the load line conditions based on the actual antenna standing wave ratio. This feedback loop compensates for variations in usage scenarios, maintaining stable transmission power and efficiency despite changes in antenna conditions. The system automatically adjusts to maintain optimal performance across different operating environments.
4Speed
If bandwidth is increased to accommodate broadband signals in 5G bands, then bandwidth is improved, but linearity deteriorates
Solution Approach 1:
The segmentation into main and auxiliary paths allows each path to be optimized for different functions. The main path handles the broadband signal amplification, while the auxiliary path specifically addresses linearity optimization through load line management. This functional segmentation enables the system to achieve both wide bandwidth and high linearity simultaneously, overcoming the typical trade-off between these two parameters.
Data Source
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Figure 2
Figure 3(a)~3(c)
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), so that performance indicators of the radio frequency power amplifier such as the area size, the bandwidth, the insertion loss, and the transmitting efficiency are optimally balanced and optimized.