Linear Power Amplifier Unit-Cell Switching for Higher Average Efficiency
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Solution Overview
Problem
Linear power amplifiers (PAs) in high-frequency applications suffer from low average efficiency due to continuous DC power consumption, even when operating at signal levels below peak power, necessitating a solution to reduce static power consumption.
Innovation Solution
Implementing a method to dynamically enable or disable subsets of PA unit cells based on signal power levels, adjusting power profiles to match the required output, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear power amplifiers operate at peak power to meet spectral mask regulations, then spectral compliance is achieved, but DC power consumption increases and average efficiency decreases
Solution Approach 1:
The power amplifier is divided into multiple independently controllable unit cells, each capable of being enabled or disabled. This segmentation allows the amplifier to operate with only the necessary number of unit cells active based on current signal requirements, reducing unnecessary DC power consumption while maintaining spectral compliance through adequate peak power capability when needed.
Solution Approach 2:
The system dynamically adjusts the number of active unit cells based on real-time signal power level detection. The controller monitors the input signal and enables or disables unit cells accordingly, transitioning the amplifier between different operational states to optimize the balance between spectral compliance and power efficiency.
2Power
If linear power amplifiers continuously draw static current to support peak power, then peak power capability is maintained, but power consumption increases at low signal levels
Solution Approach 1:
The amplifier is segmented into multiple unit cells that can be independently controlled. This allows the system to activate only the necessary number of unit cells based on current signal requirements, maintaining peak power capability when needed while reducing static power consumption during low-signal operations.
Solution Approach 2:
The system changes the operational parameters by dynamically adjusting the number of active unit cells based on signal power level. This parameter change allows the amplifier to adapt its power consumption characteristics to match the actual signal requirements, reducing static power draw while preserving peak power capability.
3Power
If multiple power amplifier unit cells are used to support peak power, then peak power output is achieved, but device complexity increases
Solution Approach 1:
The amplifier is divided into multiple unit cells that can be independently controlled. This segmentation enables the system to use only the necessary number of unit cells based on current signal requirements, reducing the effective complexity during low-power operations while maintaining the capability for high peak power output when needed.
Solution Approach 2:
Each unit cell is designed to be universally functional, capable of operating independently or in combination with other unit cells. This multi-functionality allows the same hardware architecture to support both low-power and high-power operations, reducing the need for separate amplifier circuits for different power levels.
Data Source
AI summary
A power amplifier circuit including a plurality of analog power amplifiers configured to generate a output power for an output signal; at least one processor configured to: select a highest output power signal; determine an input signal power of a modulated signal; determine an output signal power based on the input signal power; compare the output signal power and the highest output power; and disable a subset of the plurality of analog power amplifiers based on the comparison, wherein a remainder of the plurality of analog power amplifiers are configured to generate the output signal power.