Reconfigurable EBD Feed-Forward Paths for Low-Loss Duplexing
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Solution Overview
Problem
Conventional transceivers using electrical balance duplexers face challenges with signal insertion loss and increased costs due to the need for additional filters, which also result in limited isolation between transmitter and receiver paths, especially in frequency division duplexing applications.
Innovation Solution
The integration of feed-forward paths into the electrical balance duplexer allows for dynamic mode changes, including an insertion loss reduction mode, frequency swap mode, and high isolation mode, which can be selectively enabled through processing circuitry and switches, to mitigate signal loss and enhance isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrical balance duplexers are used for isolation between transmitter and receiver, then isolation is provided, but signal insertion loss increases
Solution Approach 1:
The patent implements dynamic switching between different operational modes (isolation mode and feed-forward mode) based on real-time communication conditions. The system transitions from a static EBD configuration to a dynamic reconfigurable system that adapts its topology to optimize performance metrics such as isolation and insertion loss depending on whether transmission or reception is the dominant operation.
Solution Approach 2:
The feed-forward paths act as intermediary signal routes that bypass the traditional EBD isolation path during reception. By introducing these intermediate feed-forward channels, the system provides an alternative low-loss path for received signals while maintaining the isolation capability through the original EBD structure when needed.
2Loss of energy
If additional filters are added to reduce insertion loss, then signal quality improves, but device complexity and cost increase
Solution Approach 1:
The reconfigurable EBD system serves multiple functions through a single integrated structure. The same feed-forward paths and switching mechanisms provide both insertion loss reduction during reception and isolation maintenance during transmission, eliminating the need for separate filter components that would otherwise be required to achieve these functions.
Solution Approach 2:
The system changes its operational parameters dynamically by reconfiguring the connectivity topology through switches. By altering which paths are active (isolation path vs. feed-forward path) based on operational mode, the system achieves different performance characteristics without adding physical components, thereby reducing complexity while maintaining signal quality.
3Ease of manufacture
If fixed EBD configuration is used, then manufacturing is simple, but adaptability to different communication modes is limited
Solution Approach 1:
The patent transforms a static EBD circuit into a dynamic reconfigurable system by incorporating controllable switches that enable real-time topology changes. This dynamic capability allows the same manufactured structure to adapt to different communication modes (transmission, reception, full-duplex) without requiring multiple specialized components for each mode.
Solution Approach 2:
The EBD system is segmented into distinct functional paths (isolation path and feed-forward paths) that can be independently controlled through switches. This segmentation allows selective activation of different paths based on operational requirements, providing versatility while maintaining a relatively simple base manufacturing structure that can be configured post-manufacturing.
Data Source
AI summary
Systems, methods, and devices for reducing insertion loss and/or swapping transmitter (TX) and receiver (RX) frequencies in an electrical balance duplexer (EBD) used in a transceiver device for frequency division duplexing (FDD) applications are provided. Feed-forward receiver path from the antenna to a low noise amplifier (LNA) and a feed-forward path from the antenna to a power amplifier (PA) of the EBD may be used for reducing insertion loss of the RX and TX signals. In some embodiments, switches may be used to selectively alter operational modes for varied levels of isolation and/or swapping of TX and RX frequencies.