Multi-Mode Linear Power Amplifier Without Wilkinson Combiner Loss
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Solution Overview
Problem
Existing power amplifier systems face challenges in achieving high power added efficiency (PAE) across a range of power levels without compromising linearity and performance, particularly in dual-mode amplifiers where improving PAE at low power levels often comes at the expense of linearity at higher power levels.
Innovation Solution
The implementation of a multi-mode high efficiency linear power amplifier with multiple amplification paths, where each path includes independent output impedance modification and phase shift elements, allowing for selective impedance and phase adjustment, enabling improved impedance matching and phase balance without the need for a Wilkinson power combiner, which reduces signal loss and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple amplification paths are used to improve PAE at low power levels, then power added efficiency is improved, but linearity at higher power levels deteriorates
Solution Approach 1:
The power amplifier is divided into multiple independent amplification paths (first and second paths), each capable of operating independently. This segmentation allows selective activation of paths based on power level requirements, enabling high efficiency at low power (using one path) while maintaining linearity at high power (using both paths with complementary gain characteristics)
Solution Approach 2:
The system dynamically switches between different amplification path configurations based on operating conditions. A mode selection mechanism enables transition between single-path operation (for low power/high efficiency) and dual-path operation (for high power/high linearity), making the amplifier adapt its structure to maintain optimal performance across varying power levels
2Reliability
If output impedance modification and phase shift elements are combined in each amplification path, then impedance matching and phase balance are improved, but device complexity increases
Solution Approach 1:
The output impedance modification element and output phase shift element are merged into a single integrated component within each amplification path. This combination achieves both impedance matching and phase adjustment functions simultaneously, improving overall system performance while avoiding the increased complexity that would result from separate independent components for each function
Data Source
AI summary
A power amplifier includes a plurality of amplification paths in which at least one amplification path is selectively enables and disabled, wherein each amplification path includes an output impedance modification element and a phase shift element that is operable independently from the output impedance modification element, and wherein the output impedance modification element in each amplification path provides selective impedance for each amplification path.