Radio-frequency Module Switch Topology for Multi-band Isolation
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Solution Overview
Problem
Current radio-frequency modules are large due to separate switches for different frequency bands, which complicates the circuit configuration and increases size, despite enabling multi-band transmission and reception.
Innovation Solution
A compact radio-frequency module design with a single-chip switch and shared filters, allowing for efficient switching between transmission and reception bands, including configurations where the transmission band of one band doubles as the reception band of another, optimizing circuit layout for reduced size and improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate switches are provided for switching between different frequency bands, then multi-band transmission and reception can be enabled, but the device size and circuit complexity increase
Solution Approach 1:
The patent combines multiple switch functions into a single integrated switch that can perform both the first switching operation (between antenna and duplexers) and the second switching operation (between duplexers and amplifier circuit). This single switch has multiple terminals and can be controlled by control signals to achieve the same functionality as separate switches, thereby reducing device complexity while maintaining multi-band capability
Solution Approach 2:
The single switch is designed with universal functionality to handle multiple switching tasks. It can switch between different frequency bands (Band 28A, Band 28B, Band 29) and perform both antenna switching and amplifier circuit switching functions, making it a multi-functional component that replaces multiple dedicated switches
2Adaptability or versatility
If separate switches are provided for switching between different frequency bands, then multi-band transmission and reception can be enabled, but the device size increases
Solution Approach 1:
The patent merges multiple switch components into one integrated switch unit, which physically reduces the space required in the device. Instead of having separate switch components that each occupy space, a single switch with multiple terminals consolidates the switching functionality into one compact unit, thereby reducing overall device size
3Volume of moving object
If a filter dedicated to Band 29 is omitted and the Band 28A transmitting filter is used for Band 29 reception, then device size is reduced, but signal isolation and transmission quality may be compromised
Solution Approach 1:
The patent employs dynamic switching to assign different functions to the Band 28A transmitting filter at different times. During Band 29 reception, the filter is dynamically configured to function as a receiving filter through the switching mechanism, allowing it to adapt to the reception requirement without requiring a dedicated Band 29 filter, thus maintaining signal quality while reducing device size
Solution Approach 2:
The patent changes the operational parameters of the Band 28A transmitting filter by switching it to operate in reception mode for Band 29. The filter's function is altered through control signals that change its operational state, allowing it to serve as a receiving filter with appropriate isolation characteristics for Band 29 reception
Data Source
AI summary
A radio-frequency module includes: transmitting filter and receiving filters for a first communication band; transmitting filter and receiving filters for a second communication band; and a switch including first and second common terminals and first to fifth selection terminals. The second common terminal is connected to a first input terminal. A common terminal of the transmitting and receiving filters for the first communication band and a common terminal of the transmitting and receiving filters for the second communication band are connected respectively to the first and second selection terminals. The transmitting and receiving filters for the first communication band are connected respectively to the third selection terminal and a first output terminal. The transmitting and receiving filters for the second communication band are connected respectively to the fourth selection terminal and a second output terminal. The fifth selection terminal is connected to a third output terminal.