RF Multiplexer Switch Layout to Reduce Receiving Sensitivity Loss
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Solution Overview
Problem
The multiplexer disclosed in Patent Document 1 experiences degradation in receiving sensitivity due to bunch loss, where the reception filter and transmission filter are bunched, leading to signal leakage and reduced sensitivity.
Innovation Solution
A radio frequency circuit design that includes multiple reception filters, transmission filters, and switches, where the reception filters are connected to a first switch and the transmission filters are connected to a second switch, allowing for separate signal paths and reduced bunch loss by using matching circuits to enhance impedance and prevent signal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reception filter and transmission filter are bunched together in a multiplexer, then the device complexity is reduced, but the receiving sensitivity is degraded due to bunch loss and signal leakage
Solution Approach 1:
The patent divides the filter connection structure into separate segments: the reception filter is connected to the first switch while the transmission filter is connected to the second switch. This segmentation prevents the bunch loss that occurs when filters are directly bunched together, thereby maintaining receiving sensitivity while still achieving a compact multiplexer structure.
Solution Approach 2:
The patent introduces a first switch and a second switch as intermediary components between the reception filter and transmission filter. These switches act as mediators that prevent direct signal leakage between the reception and transmission paths, thus reducing bunch loss and improving receiving sensitivity while maintaining device integration.
2Reliability
If separate signal paths are used for reception and transmission filters, then the receiving sensitivity is improved by reducing bunch loss, but the device complexity increases
Solution Approach 1:
The first switch and second switch serve multiple functions: they route signals for both reception and transmission operations, and they prevent signal leakage between paths. By using these multi-functional switches, the patent achieves separate signal paths that improve receiving sensitivity without proportionally increasing device complexity.
Solution Approach 2:
The patent combines the filter routing function and the signal isolation function into a unified switch structure. The first switch handles reception filter connection while the second switch handles transmission filter connection, merging multiple control functions into an integrated switch-based architecture that manages complexity.
Data Source
AI summary
A radio frequency circuit includes an antenna terminal, a transmission filter, multiple reception filters, a first switch, and a second switch. In the first switch, a first terminal is connectable to a second terminal or a third terminal. In the second switch, a fourth terminal is connectable to a fifth terminal. The multiple reception filters are connected to the second terminal or the third terminal of the first switch. The first terminal of the first switch is connected to the antenna terminal. The fourth terminal of the second switch is connected to the second terminal of the first switch. The fifth terminal of the second switch is connected to the transmission filter.