Power Amplifier Module Supply Switching for Carrier Aggregation
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Solution Overview
Problem
Current RF communication systems in mobile devices face challenges in efficiently managing power amplifiers for multiple frequency bands, particularly in supporting advanced features like carrier aggregation and dual connectivity, which increases complexity and cost due to the need for multiple power management units and power supply lines across the phone board.
Innovation Solution
The implementation of a power management system that includes envelope tracking and average power tracking units, allowing power amplifier modules to selectively switch between supply voltages, and a multi-mode power management unit to generate shared supply voltages for multiple power amplifier modules, reducing the number of power management units and supply lines while supporting various frequency bands and operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power management units and power supply lines are used to support carrier aggregation and dual connectivity, then the system can support multiple frequency bands and operational modes, but the device complexity and cost increase
Solution Approach 1:
The patent implements a multi-mode power management unit that can operate in different modes (envelope tracking mode and average power tracking mode) to support multiple frequency bands and operational modes. This single unit performs multiple functions that previously required separate dedicated power management units, thereby reducing device complexity while maintaining adaptability across various RF communication standards and frequency ranges
Solution Approach 2:
The patent combines multiple power management functions into a single integrated power management unit. By merging the envelope tracking and average power tracking capabilities into one unit that can selectively switch between modes, the system reduces the total number of power management units and supply lines required, directly addressing the complexity issue while preserving support for carrier aggregation and dual connectivity
2Use of energy by moving object
If traditional power management is used for power amplifiers, then the implementation is simple, but power efficiency is poor
Solution Approach 1:
The patent implements dynamic power management by enabling the power amplifier to selectively switch between envelope tracking mode (which dynamically adjusts supply voltage to match the signal envelope for high efficiency) and average power tracking mode (which provides stable average power supply). This dynamic adaptation allows the system to optimize power efficiency based on operational conditions while using a unified power management architecture
Solution Approach 2:
The patent changes the power supply parameters by implementing two different power tracking modes that adjust the supply voltage characteristics differently. Envelope tracking dynamically varies the supply voltage to follow the signal envelope, while average power tracking maintains a stable average voltage level. This parameter variation enables improved power efficiency without requiring completely separate power management systems for different efficiency requirements
Data Source
AI summary
Apparatus and methods for power amplifier power management are disclosed. In certain embodiments, a mobile device includes a transceiver that generates a radio frequency signal, a front-end system including a first power amplifier module that amplifies the radio frequency signal, and a power management system including an envelope tracking power management unit that provides an envelope tracking supply voltage to the first power amplifier module, and a first average power tracking power management unit that provides an average power tracking supply voltage to the first power amplifier module. The first power amplifier module is configured to selectively switch between the envelope tracking supply voltage and the average power tracking supply voltage.