Front-End Module Switch Layout for Lower RF Noise Figure
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Solution Overview
Problem
Existing front end modules in wireless communication systems suffer from high noise figures due to multiple switches affecting the reception signal, leading to reduced reception sensitivity.
Innovation Solution
A front end module design that includes a low noise amplifier, a power amplifier, and multiple switches configured to form different paths for reception and transmission modes, minimizing the number of switches in the signal path to reduce signal loss and improve noise figure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switches are used in the reception path to enable path switching between transmission and reception modes, then the versatility and path switching capability are improved, but the noise figure increases and reception sensitivity deteriorates
Solution Approach 1:
The patent extracts the switches from the reception path by implementing a dedicated reception bypass path that connects the antenna terminal directly to the receiving terminal, eliminating switches from the signal path. This allows the reception signal to bypass the low noise amplifier and switches entirely, thereby reducing the noise figure while maintaining the ability to switch between transmission and reception modes through separate transmission path switches.
2Adaptability or versatility
If multiple switches are placed in the signal path to enable mode switching, then the adaptability is improved, but the signal loss increases due to multiple switch insertions
Solution Approach 1:
The patent segments the signal path into distinct transmission path and reception path components. The transmission path includes switches for mode switching, while the reception path is segmented to include a bypass option that eliminates switches. This segmentation allows the system to use switches only when needed for transmission mode switching, while providing a switch-free path for reception to minimize signal loss.
3Ease of operation
If switches are positioned in the reception path to enable path selection, then the ease of operation for path switching is improved, but the reception sensitivity is reduced due to increased noise figure
Solution Approach 1:
The patent introduces a reception bypass path as an intermediary route that mediates between the need for path switching capability and the requirement for high reception sensitivity. This bypass path acts as a mediator that allows the reception signal to avoid the noisy switch-containing path while still enabling operational control through the transmission path switches, thus maintaining ease of operation without compromising reception sensitivity.
Data Source
AI summary
A front end module includes a low noise amplifier configured to amplify a receiving signal; a power amplifier configured to amplify a transmitting signal; a first switch positioned in a first path that bypasses the low noise amplifier and configured to form the first path; and a second switch positioned in the first path, connected to the first switch at a first node in the first path, and configured to form the first path together with the first switch, wherein an output terminal of the power amplifier is connected to the first node.