Multi-Mode Power Amplifier Switching for VSWR Load Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power amplifiers in radio frequency systems face efficiency and linearity degradation due to voltage standing wave ratio (VSWR) variations and beam scanning, particularly in high back-off efficiency designs like Doherty amplifiers, which are sensitive to load impedance variations.
Innovation Solution
A multi-mode power amplifier circuit that operates in Doherty, segmented, and balanced modes, adjusting termination impedance and power amplifier biasing to adapt to different VSWR ranges and beam angles, using a hybrid combiner and adjustable termination impedance circuit to optimize performance across varying load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a Doherty power amplifier is used to achieve high back-off efficiency, then efficiency is improved, but sensitivity to load impedance variations worsens
Solution Approach 1:
The patent implements dynamic mode switching between Doherty, segmented, and balanced amplifier configurations based on real-time operating conditions. The system transitions from a static Doherty architecture to a dynamic multi-mode system that adapts to load impedance variations, maintaining high efficiency across different VSWR conditions while preserving the benefits of high back-off efficiency when applicable.
Solution Approach 2:
The patent changes the operational parameters of the power amplifier by switching between different modes (Doherty, segmented, balanced) depending on the VSWR conditions. Each mode has optimized parameters for specific load impedance scenarios, allowing the system to maintain reliability across varying load conditions while preserving efficiency benefits in appropriate operating ranges.
2Area of stationary object
If beam scanning is performed in phased antenna arrays, then coverage area is improved, but VSWR variations worsen
Solution Approach 1:
The patent implements dynamic mode switching between Doherty, segmented, and balanced amplifier configurations based on real-time operating conditions. The system transitions from a static Doherty architecture to a dynamic multi-mode system that adapts to load impedance variations, maintaining high efficiency across different VSWR conditions while preserving the benefits of high back-off efficiency when applicable.
Solution Approach 2:
The system incorporates VSWR sensing and automatic mode selection based on detected impedance conditions. This feedback mechanism monitors load variations caused by beam scanning and dynamically adjusts the amplifier mode to compensate for VSWR variations, maintaining reliable operation across the full beam scanning range while preserving coverage area.
3Device complexity
If a single mode power amplifier is used to simplify the system, then device complexity is reduced, but adaptability to different VSWR conditions worsens
Solution Approach 1:
The patent creates a universal power amplifier system that can operate in multiple modes (Doherty, segmented, balanced) within a single device. This multi-functional architecture allows the amplifier to adapt to different VSWR conditions and beam scanning scenarios, providing versatility across various operating conditions while sharing common hardware resources to minimize complexity increases.
Solution Approach 2:
The patent implements dynamic mode switching between Doherty, segmented, and balanced amplifier configurations based on real-time operating conditions. The system transitions from a static Doherty architecture to a dynamic multi-mode system that adapts to load impedance variations, maintaining high efficiency across different VSWR conditions while preserving the benefits of high back-off efficiency when applicable.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Aspects of this disclosure relate to a multi-mode power amplifier circuit. The power amplifier circuit can include a first power amplifier core, a second power amplifier core, an output combiner, and an adjustable termination impedance circuit connected to a port of the output combiner. The adjustable termination circuit can provide different terminations for different modes of the multi-mode power amplifier circuit. In certain embodiments, the different modes can include a Doherty mode, a segmented mode, and/or a balanced mode. The multi-mode power amplifier circuit can operate in different modes based one or more of load impedance, voltage standing wave ratio variation, or beam angle in certain applications.