Power Amplifier Supply Circuit With Symbol-Level Envelope Tracking
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Solution Overview
Problem
Existing power amplifier power supply circuits in radio frequency communication systems face inefficiencies due to static power supply voltages that do not adapt quickly enough to changing transmit power requirements, leading to energy losses and reduced performance.
Innovation Solution
A power amplifier power supply circuit with a first and second power supply circuit connected in parallel, where the second power supply circuit dynamically adjusts the power supply voltage at the symbol level based on an envelope signal, using a main power supply branch with transistors and a gate driving circuit to rapidly change the power supply voltage, and an auxiliary branch to stabilize voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static power supply voltage is used for the power amplifier, then the circuit structure is simple, but the work efficiency is low and energy losses increase
Solution Approach 1:
The patent applies dynamics by transitioning from a static power supply voltage to a dynamic power supply voltage that changes over time. The power supply voltage is modulated to follow the envelope signal of the power amplifier output, enabling the power supply to adapt to instantaneous transmit power requirements and improve work efficiency
Solution Approach 2:
The patent implements parameter changes by varying the power supply voltage parameter dynamically. The voltage parameter is adjusted according to the envelope signal characteristics, allowing the power amplifier to operate at optimal efficiency points under different transmit power conditions
2Productivity
If the power supply voltage changes rapidly to track envelope signal, then the work efficiency improves, but voltage fluctuations and instability increase
Solution Approach 1:
The patent applies feedback by using the envelope signal (which represents the instantaneous power requirement) as a feedback parameter to control the power supply voltage. This closed-loop control ensures the power supply voltage tracks the required power level while maintaining stability through proportional control
Solution Approach 2:
The patent implements periodic action by modulating the power supply voltage at the symbol level, synchronizing with the periodic nature of communication signals. This allows the power supply to efficiently track the envelope signal while maintaining stability through rhythmic, predictable adjustments
3Loss of energy
If symbol-level power supply adjustment is implemented, then energy losses are reduced, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by implementing symbol-level power supply adjustment where the power supply voltage changes dynamically at each symbol period. This enables precise energy efficiency optimization by matching the power supply to the instantaneous transmit power requirements of each symbol
Solution Approach 2:
The patent implements segmentation by dividing the power supply control into discrete symbol-level segments. Each symbol period receives independently optimized power supply voltage, allowing fine-grained energy efficiency improvements without requiring continuous complex control mechanisms
Data Source
AI summary
A power amplifier power supply circuit includes a first power supply circuit and a second power supply circuit that are connected in parallel, where the first power supply circuit and the second power supply circuit jointly supply power to a power amplifier by using a power supply end of the power amplifier. The second power supply circuit is configured to adjust a power supply voltage of the power amplifier at a symbol level. Power supply voltages output by the second power supply circuit and the first power supply circuit change based on a change of an envelope signal output by the power amplifier.