Tri-Level Power Supply for RF Amplifier Efficiency
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Solution Overview
Problem
Conventional power amplifiers in wireless communications devices face inefficiencies due to constant boost voltage requirements, leading to power loss and reduced battery life, especially in next-generation wireless systems that require efficient power management for multiple transmit signals.
Innovation Solution
A tri-level converter architecture that switches between three power levels (auxiliary, battery, and ground) using back-to-back transistor-diode pairs with reversed body diode polarity, allowing direct paths from battery and auxiliary power sources, and employing high-side and low-side switch regions with cascode transistors to manage voltage efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant boost voltage is supplied to the power amplifier, then the power amplifier can maintain stable operation, but power loss increases and battery life decreases
Solution Approach 1:
The patent implements dynamic voltage adjustment by switching between multiple power supply levels (first power supply level from auxiliary power source, second power supply level from battery, and third power supply level of 0V) based on operational conditions. The controller dynamically selects which power supply level to apply to the power amplifier, transitioning from static constant voltage to dynamic adaptive voltage control, thereby reducing unnecessary power consumption while maintaining stable operation when needed.
2Use of energy by moving object
If envelope tracking is implemented to improve power amplifier efficiency, then power consumption decreases, but voltage spikes and di/dt noise increase
Solution Approach 1:
The patent introduces an intermediary power supply architecture with multiple controlled voltage levels (auxiliary power source and battery power source) that act as buffers between the main power source and the power amplifier. This multi-level intermediate structure allows for smoother transitions and better control over voltage changes, reducing voltage spikes and di/dt noise while maintaining the efficiency benefits of envelope tracking.
3Duration of action of stationary object
If multiple power supply levels are used to reduce power loss, then battery life extends, but device complexity increases
Solution Approach 1:
The patent segments the power supply system into distinct functional modules: an auxiliary power source providing a first power supply level, a battery providing a second power supply level, and a controller that manages switching between these levels. This segmentation allows each component to be optimized independently and simplifies the overall control logic, reducing the perceived complexity despite the multi-level architecture.
Data Source
AI summary
A tri-level converter provides three levels of power supply to a power amplifier that includes a supply path. The supply path has a first transistor and a first inherent body diode associated with the first transistor, as well as a second transistor and a second inherent body diode associated with the second transistor. A polarity of the second body diode is reversed relative to a polarity of the first body diode. A first driver is configured to drive the first transistor and the first inherent body diode to control a power supply, including a battery supply signal, to an output of the tri-level converter. The tri-level converter is coupled to a switching node.