Switched-Filter Duplexing Architecture for Wireless Front-Ends
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Solution Overview
Problem
Current wireless systems face challenges in simultaneous transmit and receive operations, particularly in uplink carrier-aggregation applications, where intermodulation distortion from high-power transmit signals can de-sensitize receive bands, requiring additional hardware and circuit board space.
Innovation Solution
A switched-filter duplexing architecture that includes a first system for simultaneous transmit and receive operations on one band and a second system for transmit operations on another band, using a switchable path and duplexer configuration to isolate intermodulation distortion and allow flexible routing of transmit signals between antenna nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional hardware is added to isolate intermodulation distortion in uplink carrier-aggregation applications, then receive band de-sensitization is reduced, but device complexity and circuit board space increase
Solution Approach 1:
The duplexer is designed to perform multiple functions: it provides frequency-division duplexing for the first band while simultaneously providing isolation for the second band transmit operations. This multi-functionality eliminates the need for separate isolation hardware, reducing device complexity while maintaining receive band sensitivity.
Solution Approach 2:
The patent combines the duplexing function and the isolation function into a single duplexer component. By merging these functions, the system avoids adding separate hardware for intermodulation distortion isolation, thereby reducing circuit board space and device complexity while protecting receive band sensitivity.
2Object-generated harmful factors
If separate transmit paths are used for different bands, then intermodulation distortion is reduced, but the quantity of hardware increases
Solution Approach 1:
The duplexer acts as an intermediary component that manages signal paths between different bands. It provides the necessary isolation between first band transmit/receive paths and second band transmit paths without requiring completely separate hardware systems, thus reducing the quantity of hardware while controlling intermodulation distortion.
Solution Approach 2:
The single duplexer is designed to handle multiple transmit paths and provide isolation across different frequency bands simultaneously. This multi-functional design eliminates the need for separate isolation hardware for each band, reducing overall hardware quantity while maintaining low intermodulation distortion.
3Quantity of substance
If a single antenna node is used for both first band and second band operations, then hardware quantity is reduced, but signal isolation becomes difficult to maintain
Solution Approach 1:
The duplexer is designed with different characteristics for different frequency bands: it provides frequency-division duplexing functionality for the first band and isolation functionality for the second band. This localized optimization of the duplexer's properties allows a single antenna node to handle multiple bands while maintaining signal isolation through the frequency-selective nature of the filter elements.
Solution Approach 2:
The duplexer utilizes frequency as a distinguishing parameter to separate different signal paths. By designing filters with specific frequency responses tailored to different bands, the system enables a single antenna node to handle multiple bands simultaneously while maintaining isolation through frequency-selective filtering rather than requiring separate physical paths.
Data Source
AI summary
Switched-filter duplexing architecture for front-end systems. In some embodiments, a wireless architecture can include a first system having a first signal routing circuit for a first transceiver, and a first antenna node, and be configured to be capable of simultaneous transmit and receive operations for a first band and a receive operation for a second band through the first antenna node. The wireless architecture can further include a second system having a second signal routing circuit for a second transceiver and a second antenna node, and be configured to be capable of a transmit operation for the second band through the second antenna node. The wireless architecture can further include a switchable path implemented to selectively allow the transmit operation for the second band to be performed through the second antenna node of the second system or the first antenna node of the first system.