Reconfigurable RF Power Amplifier for Antenna Mismatch Adaptation
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Solution Overview
Problem
Power amplifiers in RF transceivers face challenges in achieving both high linearity and efficiency, with existing architectures often compromising on one aspect at the expense of the other, and struggling with time-varying antenna mismatch conditions.
Innovation Solution
A reconfigurable RF power amplifier with adjustable amplification paths and a reconfigurable isolator that can switch between linear, efficient, and intermediate operating modes based on signal characteristics, such as EVM and antenna mismatch, to optimize linearity and efficiency dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplifier is configured for high linearity operation, then linearity is improved, but efficiency deteriorates
Solution Approach 1:
The amplifier circuit dynamically switches between different operating modes (linear mode, efficient mode, intermediate mode) based on real-time signal characteristics such as EVM requirements and antenna mismatch conditions. This is achieved through a reconfigurable architecture that can adjust the operating point of the power amplifier stage, allowing the system to optimize the trade-off between linearity and efficiency dynamically rather than being fixed in one mode.
Solution Approach 2:
The invention changes key operating parameters of the amplifier including bias conditions, load impedance, and operating point based on the detected signal characteristics. By adjusting these parameters, the amplifier can transition between high linearity mode (with higher bias current and specific load conditions) and high efficiency mode (with lower bias current and different load conditions), thereby resolving the contradiction between linearity and efficiency.
2Use of energy by moving object
If the amplifier is configured for high efficiency operation, then efficiency is improved, but linearity deteriorates
Solution Approach 1:
The system dynamically adjusts the amplifier's operating mode based on real-time conditions. When efficiency is prioritized (such as during battery-powered operation or when signal conditions permit), the amplifier switches to efficient mode with optimized bias points. When linearity requirements increase (such as during high EVM requirements or antenna mismatch conditions), the system automatically transitions to linear mode, thus dynamically resolving the efficiency-linearity trade-off.
Solution Approach 2:
The invention implements parameter changes by adjusting bias currents, load impedances, and operating points based on detected signal characteristics. The system can lower bias current and adjust load conditions to maximize efficiency when linearity requirements are relaxed, while maintaining the capability to quickly revert to high linearity parameters when needed, thus resolving the contradiction in favor of efficiency when appropriate.
3Device complexity
If the amplifier uses a fixed architecture, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The amplifier architecture is segmented into distinct functional blocks including a power amplifier stage, driver stage, and reconfigurable elements. This segmentation allows independent optimization of each block and enables flexible reconfiguration through switching elements and variable components, achieving adaptability without proportionally increasing overall system complexity.
Solution Approach 2:
The reconfigurable amplifier architecture serves multiple functions through a single unified structure. The same amplifier circuit can operate in linear mode, efficient mode, or intermediate mode depending on configuration, eliminating the need for separate dedicated circuits for each mode. This multi-functionality reduces overall device complexity while maintaining high adaptability to different operating conditions and signal characteristics.
Data Source
AI summary
An amplifier circuit includes a first adjustable amplification path and a second adjustable amplification path; wherein the first adjustable amplification path and the second adjustable amplification path are configurable in different operating modes selected from a linear operating mode, an efficient operating mode, and an intermediate operating mode to amplify a transmission signal based at least in part on a characteristic of the transmission signal.