Envelope Tracking PA Architecture With Multi-Voltage RF Supply Alignment
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Solution Overview
Problem
The increased output power of RF signals in mobile communication devices for higher data rates leads to higher power consumption and thermal dissipation, compromising performance and user experience, which existing power management technologies like envelope tracking (ET) struggle to efficiently address.
Innovation Solution
An envelope tracking (ET) amplification architecture that includes a signal processing unit generating target voltages for multiple tracking amplifiers, which provide modulated voltages to a power amplifier block, with choke inductors and equalizers to compensate voltage distortions, and a multi-level voltage converter with a charge pump and LDO/switch unit to optimize power supply efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output power of RF signals is increased to achieve higher data rates, then the data transmission capability is improved, but the power consumption and thermal dissipation increase
Solution Approach 1:
The patent implements dynamic supply voltage adjustment for power amplifier stages, where the supply voltage is continuously varied to track the instantaneous power requirements of the RF signal. This dynamic voltage scaling allows the PA to maintain high efficiency across varying output power levels, resolving the contradiction between high data rate transmission and power consumption by adapting the power supply to actual signal demands rather than using fixed high voltage.
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by implementing envelope tracking technology, which dynamically adjusts the supply voltage envelope to match the signal envelope. This parameter modulation enables the PA to operate at optimal efficiency points across different power levels, achieving high data rates without proportionally increasing power consumption and thermal dissipation.
2Use of energy by moving object
If the supply voltage is constantly adjusted to maintain PA efficiency, then the power efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent segments the power amplifier into multiple stages, each with its own supply voltage control. This segmentation allows independent optimization of each stage's efficiency while distributing the complexity of voltage adjustment across manageable units. The envelope tracking system is divided into separate control loops for different PA stages, making the overall complex system more controllable and maintainable.
Solution Approach 2:
The patent introduces an envelope detector and voltage control mechanism as an intermediary between the RF signal and the PA supply voltage. This intermediary component extracts the envelope information from the RF signal and uses it to modulate the supply voltage, thereby automating the efficiency optimization process and reducing the need for complex manual or feedback-based control systems.
3Use of energy by moving object
If multiple tracking amplifiers are used to provide multiple voltages, then the power efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple voltage supply functions into a unified envelope tracking architecture where multiple tracking amplifiers work in coordination rather than independence. The multiple PAs share a common envelope detection and control mechanism, allowing them to be controlled as an integrated system. This merging approach maintains the efficiency benefits of multiple voltage supplies while reducing overall system complexity through shared control infrastructure.
Data Source
AI summary
The present disclosure relates to an envelope tracking (ET) amplification architecture, which includes a power amplifier (PA) block configured to amplify a radio frequency (RF) input signal and provide an RF output signal, and an ET voltage block configured to provide modulated voltages to the PA block as power supplies. Herein, the modulated voltages are provided based on a configuration of the PA block and from one pulsed ramp signal, which contains envelope information of the RF input signal. The modulated voltages are eligible to have at least one of a time delay difference, an amplitude difference, and a phase difference.