Low-Ron Antenna Switch Modules for Carrier Aggregation
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Solution Overview
Problem
The simultaneous connection of multiple filters in RF modules for carrier aggregation and ENDC leads to loading issues, reducing performance and power efficiency due to increased Ron resistance in antenna switch modules.
Innovation Solution
Implementing antenna switch modules with switches having lower on-state resistance by increasing the gate length and reducing the number of stacked gates for switches used in multiplexing wireless communication, while maintaining the same or smaller die size as modules with uniformly configured switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters are connected to the antenna simultaneously for carrier aggregation and ENDC, then multiplexing capability is improved, but loading between filters increases causing performance degradation and reduced power efficiency
Solution Approach 1:
The patent applies different switch configurations to different functional paths: single-band switches for standard operation and multi-band switches with lower on-state resistance for carrier aggregation and ENDC operations. This local differentiation optimizes power efficiency specifically where multiplexing occurs, without compromising other system functions.
Solution Approach 2:
The patent changes the on-state resistance parameter of switches by using different physical configurations (gate length, number of stacked gates) depending on the operational mode. Multi-band switches used during carrier aggregation have lower on-state resistance compared to single-band switches, directly reducing loading effects and improving power efficiency during multiplexing operations.
2Adaptability or versatility
If multiple filters are connected to the antenna simultaneously for carrier aggregation and ENDC, then multiplexing capability is improved, but filter performance is reduced due to loading effects
Solution Approach 1:
The patent implements local quality differentiation by using specialized multi-band switches with optimized characteristics (lower on-state resistance) specifically at the antenna connection points where multiple filters are simultaneously connected. This localized optimization minimizes loading effects on filters during carrier aggregation and ENDC while maintaining standard switch configurations elsewhere in the system.
Solution Approach 2:
The patent modifies the on-state resistance parameter of switches based on their functional role. Multi-band switches that connect multiple filters to the antenna have lower on-state resistance values achieved through increased gate length and reduced number of stacked gates, thereby reducing the loading effect on filters and preserving filter performance during multiplexing operations.
3Reliability
If switches with lower on-state resistance are used for multiplexing, then loading between filters is reduced, but switch complexity increases due to different gate lengths and stacked gate configurations
Solution Approach 1:
The patent segments the switch population into distinct types based on functional requirements: single-band switches for standard operations and multi-band switches for carrier aggregation and ENDC. This segmentation allows each switch type to be independently optimized without affecting the entire system, managing complexity through functional categorization.
Solution Approach 2:
The patent creates multi-band switches that can handle multiple frequency bands simultaneously, making these switches universal for carrier aggregation and ENDC operations. This multi-functionality reduces the need for multiple specialized switches, thereby managing overall device complexity while achieving the goal of reduced loading during multiplexing.
4Reliability
If switches with different configurations are used for single-band and multi-band operations, then performance is optimized, but manufacturing complexity increases
Solution Approach 1:
The patent segments manufacturing into two distinct processes: standard single-band switch fabrication and specialized multi-band switch fabrication. By clearly defining separate manufacturing pathways for each switch type with specific gate length and stacked gate requirements, the patent manages manufacturing complexity through standardized segmentation rather than attempting to produce all switches with variable parameters.
Solution Approach 2:
The patent establishes specific parameter values for different switch types (gate length of about 180 um and fewer stacked gates for multi-band switches versus about 140 um for single-band switches). These discrete parameter specifications simplify manufacturing by providing clear design targets rather than continuous optimization requirements, making the complexity manageable through parameter standardization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces loading between filters during carrier aggregation and ENDC, improving insertion loss and power output of mobile devices by minimizing Ron resistance, thereby enhancing battery life and performance.
Implementation Method 1
the second switches having a lower on-state resistance than the first switch
Data Source
AI summary
Systems and methods for reducing loading in antenna switch module multiplexing are disclosed. In one aspect, a radio frequency front end includes a plurality of filters configured to filter radio frequency signals, the filters including a first filter configured for single band wireless communication and two second filters configured for multiplexing wireless communication. The radio frequency front end further includes an antenna switch module including a first switch configured to connect an antenna to the first filter for the single band wireless communication, and two second switches configured to connect the antenna to the second filters for the multiplexing wireless communication, the second switches having a lower on-state resistance than the first switch.