RF Power Amplifier Supply Path Switching for Band-Specific Filtering
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Solution Overview
Problem
Existing RF module designs face challenges in achieving both low loss and favorable attenuation characteristics across multiple communication bands, particularly when using a common path for supplying power supply voltage to power amplifiers supporting various communication bands.
Innovation Solution
The RF module incorporates multiple power amplifiers, an external connection terminal, a filter, and a switch. The filter is strategically placed on a path between the external connection terminal and only one of the power amplifiers, allowing the switch to route the power supply voltage either with or without the filter, depending on the communication band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common path is used to supply power supply voltage to power amplifiers supporting multiple communication bands, then device complexity is reduced, but it becomes difficult to achieve both low loss and favorable attenuation characteristics in all communication bands
Solution Approach 1:
The power supply path is segmented into multiple independent paths, with each path containing a filter specifically designed for certain communication bands. This allows different bands to receive power supply voltage with appropriate filtering characteristics, resolving the contradiction between device complexity and attenuation performance.
Solution Approach 2:
A switching element is introduced to dynamically select between different power supply paths based on the active communication band. This dynamic configuration enables the system to achieve optimal attenuation characteristics for each band without permanently increasing complexity, as the additional paths are only activated when needed.
2Reliability
If a filter is placed on the power supply path to reduce harmonic components, then attenuation characteristic is improved, but signal loss increases
Solution Approach 1:
Different power supply paths are equipped with filters having different characteristics tailored to specific communication bands. This local optimization ensures that filtering is applied only where and when needed, minimizing energy loss while maintaining adequate attenuation for each band's specific requirements.
Solution Approach 2:
The switching element enables dynamic selection of power supply paths with appropriate filter characteristics based on the active communication band. This allows the system to adaptively balance between attenuation performance and energy loss by selecting the most suitable path for each operating condition.
Data Source
AI summary
A radio frequency module is provided that includes a plurality of power amplifiers, an external connection terminal, a filter, and a switch. The amplifiers include a first power amplifier and a second power amplifier. The external connection terminal is connected to a tracker component configured to supply a power supply voltage to the power amplifiers. Moreover, the filter is not disposed on a first path between the external connection terminal and the first power amplifier, but instead it is disposed on a second path between the external connection terminal and the second power amplifier. The switch is configured to switch connection to the external connection terminal between the first path and the second path.