Power Amplifier Supply Switching for Multi-Band RF Efficiency

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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 costs 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 modes.

Engineering Contradictions & Design Principles

VSEngineering 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 advanced features, but the device complexity and cost increase

Engineering Contradiction:

Improvesupport for multiple frequency bands and advanced featuresVSAvoidnumber of power management units and supply lines

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The power management unit is designed to perform multiple functions by dynamically switching between envelope tracking mode and average power tracking mode. This multi-functionality allows a single power management unit to support multiple frequency bands and advanced features like carrier aggregation and dual connectivity, eliminating the need for separate power management units for different operating modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system dynamically switches between envelope tracking and average power tracking modes based on the operating conditions and frequency band being used. This dynamic adaptation allows the power management unit to optimize performance for different scenarios while maintaining a simplified hardware architecture, resolving the contradiction between versatility and complexity.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If envelope tracking supply voltage is used for all power amplifier modules, then power efficiency is improved, but the number of power management units increases

Engineering Contradiction:

Improvepower efficiency of power amplifierVSAvoidnumber of power management units

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The power management unit is designed to serve multiple power amplifier modules across different frequency bands by implementing both envelope tracking and average power tracking modes. This universal design allows a single power management unit to efficiently power multiple amplifiers, maintaining high power efficiency while reducing the total number of power management units required.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system changes the operating parameters of the power management unit, switching between envelope tracking mode for high efficiency in specific bands and average power tracking mode for other bands. This parameter change allows optimal power efficiency to be achieved across multiple frequency bands without requiring separate dedicated power management units for each band.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If separate power management units are used for different frequency bands, then power optimization for each band is achieved, but the device size and cost increase

Engineering Contradiction:

Improvepower optimization per frequency bandVSAvoiddevice size and component count

Core Design Contradiction:

Use of energy by moving objectVSArea of stationary object

Solution Approach 1:

The power management unit is designed as a universal platform that can optimize power delivery for multiple frequency bands by dynamically switching between envelope tracking and average power tracking modes. This eliminates the need for separate dedicated power management units for each frequency band, reducing device size and component count while maintaining band-specific power optimization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the functionality of multiple separate power management units into a single unified power management unit that handles multiple frequency bands. By combining these functions and implementing mode switching, the system achieves power optimization for each band without the physical separation of dedicated units, thereby reducing overall device size and component count.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12095430B2Power amplifier power management in user equipment

Publication Date: 2024.09.17 SKYWORKS SOLUTIONS INC

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.