RF Circuit Segmentation for 4G-5G Signal Isolation
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Solution Overview
Problem
Radio frequency front-end circuits struggle to maintain signal isolation when simultaneously transferring radio frequency signals from multiple communication systems with overlapping frequency bands, such as 4G and 5G, leading to signal deterioration.
Innovation Solution
A radio frequency circuit configuration that includes two transfer circuits with overlapping passbands for different communication systems, allowing for the distribution of overlapping signals into separate circuits to improve isolation, and the use of power amplifiers with optimized bias signals for each communication system to enhance amplification performance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radio frequency signals of multiple communication systems with overlapping frequency bands are simultaneously transferred via the same transfer circuit, then the device complexity is reduced, but the isolation between signals deteriorates
Solution Approach 1:
The patent divides the transfer circuit into multiple separate transfer circuits (first transfer circuit and second transfer circuit), each handling different communication systems. This segmentation allows signals from different systems to be processed independently, preventing interference and maintaining signal isolation while simultaneously supporting multiple communication systems.
Solution Approach 2:
The patent introduces switching circuits as intermediaries between the antennas and transfer circuits, and between transfer circuits and baseband processing circuits. These switching circuits enable flexible routing and isolation of signals from different communication systems, allowing the system to maintain good isolation while supporting simultaneous operation of multiple systems.
2Reliability
If separate transfer circuits are used for different communication systems, then the signal isolation is improved, but the device complexity increases
Solution Approach 1:
The patent designs transfer circuits that can handle multiple communication systems (e.g., both LTE and 5G NR) within a single circuit. Each transfer circuit is configured with filters and switching mechanisms that allow it to process signals from different communication systems, reducing the need for completely separate dedicated circuits for each system while maintaining signal isolation.
Solution Approach 2:
The patent employs dynamic switching circuits that can reconfigure the signal paths based on which communication systems are currently in use. This dynamic reconfiguration allows the system to activate only the necessary transfer circuits and filtering paths, reducing complexity when not all systems are simultaneously operational while maintaining isolation when needed.
3Reliability
If power amplifiers with optimized bias signals are used for each communication system, then the amplification performance is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic bias signal optimization where the bias signals for power amplifiers are adjusted based on the active communication system and operating conditions. The bias control circuits receive feedback about which communication system is currently transmitting and dynamically adjust the bias levels to optimize amplification performance for that specific system while minimizing power consumption when amplifiers are not in use or operating at low levels.
Data Source
AI summary
A radio frequency circuit includes a first transfer circuit including a first filter and a second filter, and a second transfer circuit including a third filter and a fourth filter. Passbands of the first filter and the third filter at least partially overlap each other. Passbands of the second filter and the fourth filter at least partially overlap each other. The first filter transfers a radio frequency signal of a first communication system. The third filter transfers a radio frequency signal of a second communication system. The second filter transfers one of a radio frequency signal of the first communication system or a radio frequency signal of the second communication system. The fourth filter transfers the other of a radio frequency signal of the first communication system or a radio frequency signal of the second communication system.