RF Splitter Circuit With Bypass Paths for LTE-LAA and WiFi Coexistence
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Solution Overview
Problem
The coexistence of LTE-LAA and WiFi wireless environments in mobile devices requires a front end module that can handle overlapping unlicensed bands, particularly the 6 GHz band, necessitating a splitter circuit capable of simultaneous operation and efficient signal splitting to prevent performance degradation.
Innovation Solution
A splitter circuit with bypass circuits and a signal divider that selectively splits or bypasses RF signals based on communication modes, using switches and matching circuits to manage impedance and prevent unnecessary signal loss, allowing for coexistence of LTE-LAA and WiFi signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a splitter circuit is used to simultaneously support LTE-LAA and WiFi communication schemes, then coexistence capability is improved, but device complexity increases due to additional circuits and switching mechanisms
Solution Approach 1:
The splitter circuit is divided into multiple functional segments including a signal divider for simultaneous communication modes and bypass circuits for single communication modes. Each segment is controlled by independent switching mechanisms that can be selectively activated based on the communication scenario, allowing the system to achieve coexistence capability while avoiding unnecessary complexity in single-mode operations.
Solution Approach 2:
The splitter circuit is designed with multi-functional capability to handle both LTE-LAA and WiFi communication schemes through a unified structure. The circuit can dynamically adapt its configuration to serve different communication standards, eliminating the need for separate dedicated circuits for each standard and thereby reducing overall device complexity while maintaining versatility.
2Adaptability or versatility
If signal splitting is performed for simultaneous communication modes, then coexistence operation is enabled, but signal loss increases due to division of signal power
Solution Approach 1:
The circuit employs dynamic switching mechanisms that can adaptively select between signal splitting mode and bypass mode based on the communication requirements. When only single communication mode is needed, the bypass circuit directs the full signal power through the direct path, avoiding signal division and minimizing power loss. When simultaneous communication modes are required, the signal divider is activated to provide appropriate signal distribution.
3Productivity
If bypass circuits are added to reduce signal loss, then transmission efficiency is improved, but device complexity increases due to additional switching components
Solution Approach 1:
The bypass circuits are pre-configured with switching mechanisms that can be activated in advance based on predicted communication scenarios. The control system proactively selects the bypass path when single-mode operation is anticipated, preventing signal loss before it occurs. This preliminary action approach allows the system to maintain high transmission efficiency while using a manageable number of switching components that are strategically placed to handle the most common scenarios.
Data Source
AI summary
A splitter circuit includes: a signal divider configured to split and transmit a first radio frequency (RF) signal received in a first receiving mode in which a first communication scheme and a second communication scheme are simultaneously performed; a first bypass circuit configured to bypass the signal divider to transmit a second RF signal received in a second receiving mode in which the first communication scheme is performed; and a second bypass circuit configured to bypass the signal divider to transmit a third RF signal received in a third receiving mode in which the second communication scheme is performed.