Uplink Carrier Aggregation Front-End Architecture
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Solution Overview
Problem
Current front-end architectures for wireless devices face challenges in supporting uplink carrier aggregation (UL CA) and simultaneous 4×4 MIMO operations across various frequency bands, particularly due to limitations in switch linearity and power management, which affect intermodulation distortion and signal flow efficiency.
Innovation Solution
The proposed front-end architecture incorporates a low-band power amplifier with integrated duplexer, mid-band power amplifiers with integrated duplexers for UL CA, and a power management unit to supply voltage to these modules, enabling flexible support for all intended combinations of UL CA and 4×4 MIMO operations by minimizing filter duplication and optimizing antenna connectivity and signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional front-end architecture with separate power amplifiers and duplexers is used for each frequency band, then the device can support multiple frequency bands, but the device complexity and size increase due to filter duplication and multiple antenna switch modules
Solution Approach 1:
The patent combines multiple power amplifiers and duplexers into a single integrated module that can handle multiple frequency bands. Specifically, a first power amplifier with integrated duplexer handles low-band frequencies, while a second power amplifier with integrated duplexer handles mid-band and high-band frequencies, eliminating the need for separate components for each band and reducing overall device complexity
Solution Approach 2:
The patent designs power amplifier modules with integrated duplexers that can operate across multiple frequency bands. The second power amplifier module, for example, can provide uplink carrier aggregation for both mid-band and high-band frequencies, making it a universal component that replaces what would traditionally require multiple separate components
2Adaptability or versatility
If traditional antenna switching networks are used to route signals between multiple antennas and frequency bands, then the device can support MIMO and carrier aggregation, but signal loss increases due to switch linearity limitations and multiple routing points
Solution Approach 1:
The patent segments the frequency spectrum into distinct bands (low-band, mid-band, high-band) and assigns dedicated power amplifier modules with integrated duplexers to each segment. This segmentation allows signals to be processed in dedicated paths without passing through multiple general-purpose antenna switches, reducing signal loss while maintaining support for MIMO and carrier aggregation across different frequency segments
Solution Approach 2:
The patent introduces integrated duplexers as intermediary components within each power amplifier module. These duplexers serve as mediators that can simultaneously handle transmit and receive signals for specific frequency bands, eliminating the need for signals to pass through external antenna switch networks and thereby reducing insertion loss and improving signal integrity
3Reliability
If multiple separate power amplifier modules are used for low-band, mid-band, and high-band frequencies, then each band can be optimized independently, but the overall device size and cost increase
Solution Approach 1:
The patent merges the mid-band and high-band power amplifiers and their respective duplexers into a single integrated module. This allows the device to maintain independent optimization for different frequency bands while reducing the total number of separate modules, thereby controlling device size and complexity without sacrificing band-specific performance
Data Source
AI summary
Described herein are front-end architectures and wireless devices that support uplink carrier aggregation and simultaneous MIMO operations in a plurality of band combinations. The front-end architectures include a combination of low-band, mid-band, high-band, MIMO, and uplink carrier aggregation modules to provide the described functionality. The architectures include an antenna switch module coupled to a first antenna and to a second antenna. The second antenna is coupled to the antenna switch module through a diplexer that combines high- and mid-band signals with low-band signals received from a low-band module, the low-band signals coupled to the diplexer without passing through the antenna switch module.