RF Module Auxiliary Switch Path for Independent Filter Testing
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Solution Overview
Problem
The high degree of integration in RF modules for mobile communication devices complicates independent measurement of passive circuit elements like filters and matching elements due to coupling with power amplifiers, making it difficult to determine module performance and identify faulty devices without influencing the power amplifier.
Innovation Solution
An RF module design with a switch that decouples the power amplifier from the filter section, allowing direct access to the filter section via an auxiliary terminal for independent testing, enabling the determination of filter parameters and performance without power amplifier influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the frontend section and power amplifier are highly integrated in a smaller volume, then miniaturization is achieved, but independent measurement of passive circuit elements becomes impossible due to coupling
Solution Approach 1:
The signal path is segmented into multiple sections using switches. The first switch divides the path between power amplifier and filter section, while the second switch divides the filter section into parallel branches. This segmentation allows independent access to the filter section for measurement without the power amplifier's influence, resolving the measurement problem while maintaining integration.
Solution Approach 2:
Switches are introduced as intermediary components that can selectively connect or disconnect different parts of the circuit. The switches act as mediators that enable independent access to the filter section for measurement purposes while maintaining the integrated structure during normal operation, thus allowing precise measurement without compromising miniaturization.
2Measurement precision
If the frontend section and power amplifier are manufactured independently and then combined, then independent testing is possible, but additional contact pins are required and space is increased
Solution Approach 1:
The switch control logic is merged with the existing module structure, and the switches themselves are integrated into the signal path between the power amplifier and filter section. This merging allows independent testing capability to be achieved within the already allocated space of the integrated module, avoiding the need for additional external contact pins and maintaining miniaturization.
3Measurement precision
If the frontend section and power amplifier are manufactured independently and then combined, then independent testing is possible, but manufacturing time and cost increase
Solution Approach 1:
The switches are pre-integrated into the module structure during manufacturing, with their control logic prepared in advance. This preliminary integration allows for rapid switching between measurement and operation modes during testing, eliminating the need for complex assembly procedures and reducing manufacturing time and cost while enabling independent filter section testing.
4Volume of moving object
If the frontend section and power amplifier are combined in a highly integrated module, then miniaturization is achieved, but identifying faulty devices becomes more difficult
Solution Approach 1:
The signal path is segmented into multiple sections using switches. The first switch divides the path between power amplifier and filter section, while the second switch divides the filter section into parallel branches. This segmentation allows independent access to the filter section for measurement without the power amplifier's influence, resolving the measurement problem while maintaining integration.
Solution Approach 2:
Switches are introduced as intermediary components that can selectively connect or disconnect different parts of the circuit. The switches act as mediators that enable independent access to the filter section for measurement purposes while maintaining the integrated structure during normal operation, thus allowing precise measurement without compromising miniaturization.
Data Source
AI summary
An RF module with improved testing capabilities is provided. The module has a first switch with signal outputs and an additional auxiliary connection connected to an auxiliary terminal. The auxiliary terminal can be connected to an RF filter while a power amplifier is decoupled from the filter.