FEM Switch Topology for Multi-Band PA Power Supply Sharing
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Solution Overview
Problem
Electronic devices face challenges in supporting various frequency ranges with a simplified structure of power supply circuits, necessitating a more flexible and reduced number of components for improved antenna performance.
Innovation Solution
The implementation of a front-end module (FEM) with a switch that optimizes the connection structure of power supply circuits, allowing for miniaturization and reduced component count while supporting multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate switching element is added to control the power supply to the display unit, then the display unit can be selectively powered, but the device complexity increases
Solution Approach 1:
The switching element is integrated into the pixel circuit structure, merging the switching function with the display pixel circuit. This eliminates the need for a completely separate switching element and reduces overall device complexity while maintaining selective power supply capability.
Solution Approach 2:
The pixel circuit is designed to serve multiple functions: it acts as both the display pixel circuit and the switching element for power control. This multi-functionality reduces the total number of components needed in the device.
2Reliability
If the source signal line is extended to extend into the first direction beyond the data decoding unit, then signal distribution is improved, but the layout area increases
Solution Approach 1:
The source signal line is routed in a multi-dimensional path, extending in the first direction beyond the data decoding unit while utilizing vertical and lateral spaces efficiently. This allows signal distribution improvement without a proportional increase in layout area.
Solution Approach 2:
The source signal line is nested within the existing pixel circuit layout structure, utilizing available spaces between other circuit elements. This allows the signal line to extend further without occupying additional layout area that would increase the overall device footprint.
3Ease of manufacture
If the data decoding unit is disposed between the first scanning line and the second scanning line, then signal routing is simplified, but the pixel circuit layout becomes more complex
Solution Approach 1:
The pixel circuit is segmented into distinct functional blocks: the data decoding unit is separated and positioned between scanning lines, while the switching element and other components are arranged in specific regions. This segmentation simplifies signal routing by creating clear signal paths between functional blocks.
Solution Approach 2:
The pixel circuit layout employs asymmetric arrangement where the data decoding unit is positioned between the first and second scanning lines rather than in a symmetric location. This asymmetric placement simplifies signal routing by creating more direct signal paths while the overall layout maintains functional symmetry.
Data Source
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AI summary
An electronic device includes a first power supply circuit, a second supply circuit, a switch, a first front end module (FEM), a second FEM, a third FEM, a fourth FEM, and a processor. The processor is configured to, based on transmitting a signal using a first power amplifier (PA) in the first FEM operating based on a first voltage provided from the first power supply circuit, electrically connect the second power supply circuit to a third PA and a fourth PA through the switch, to transmit a signal using the third PA in the third FEM or the fourth PA in the fourth FEM operating based on a second voltage provided from the second power supply circuit. Various other embodiments are possible.