Multi-Mode Power Amplifier Branching for Low-Power PAE and Linearity
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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, particularly in multi-mode power amplification topologies where improving PAE at low power levels often comes at the expense of linearity at higher power levels.
Innovation Solution
A multi-mode power amplifier system that includes high-power, mid-power, low-power, and ultra-low-power modes, with the ability to selectively enable or disable amplifier branches, eliminating the need for an RF switch to avoid impedance mismatch and board layout issues, and utilizing a load insensitive power amplifier structure to maintain performance across various power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an RF switch is used to provide ultra-low-power mode, then power consumption is reduced, but impedance mismatch and board layout problems occur
Solution Approach 1:
The patent removes the RF switch component from the system entirely. Instead of using an RF switch to achieve ultra-low-power mode, the invention extracts this component and replaces it with a direct connection approach that maintains impedance match while reducing power consumption through selective amplifier branch disabling.
Solution Approach 2:
The power amplifier is divided into multiple independently controllable branches (first branch with first amplifier, second branch with second amplifier). By selectively enabling or disabling specific branches, the system achieves different power modes without requiring an RF switch, thus maintaining impedance match while reducing power consumption.
2Loss of energy
If multiple amplification paths are implemented to improve PAE at low power levels, then power added efficiency is improved, but linearity at higher power levels deteriorates
Solution Approach 1:
The system dynamically selects which amplifier branch to operate based on the required power level. At low power levels, only the first amplifier branch is active, while at higher power levels, the second amplifier branch is enabled. This dynamic configuration allows the system to optimize PAE at each power level while maintaining linearity through proper branch selection and load matching.
Solution Approach 2:
The invention changes the operational parameters by selectively activating different amplifier branches for different power levels. The first amplifier branch is optimized for low-power operation with corresponding load matching, while the second amplifier branch handles high-power operation. This parameter-based segmentation resolves the contradiction between PAE and linearity.
Data Source
AI summary
A multi-mode power amplifier includes a high-power mode amplifier circuit, a mid-power mode amplifier circuit, and a low power amplifier circuit, where the low-power mode amplifier circuit comprises a plurality of independently selectable power cell/amplifier branches. The multi-mode power amplifiers selectively enable or disable amplifier branches to provide multiple levels of amplification. Selectively enabling certain of a plurality of split collector amplifier branches provides multiple low power and ultra-low power amplifier modes without the impedance mismatch or board layout problems associated with an RF switch.