Transceiver Front-End Frequency Blocking for Duplex Isolation
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Solution Overview
Problem
Current transceiver front-ends for communication devices face challenges in providing effective isolation between transmitters and receivers, particularly in frequency division duplex communication systems, due to the high cost, bulkiness, and frequency-fixation of off-chip duplexers, as well as the complexity and power loss associated with on-chip impedance matching and signal cancellation methods.
Innovation Solution
The implementation of a transceiver front-end with transmit and receive frequency blocking arrangements, comprising networks of passive components including transformers and filter arrangements, which block unwanted frequency signals while allowing desired frequencies to pass through, thereby isolating the transmitter from the receiver and vice versa without the need for complex impedance matching or dummy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If off-chip acoustic wave duplex filters are used to provide isolation between transmitter and receiver, then isolation performance is improved, but cost increases, device size increases, and frequency adaptability decreases
Solution Approach 1:
The patent extracts the isolation function from traditional off-chip acoustic wave duplex filters and implements it using on-chip cancellation circuits and switching mechanisms, thereby removing the need for bulky off-chip components while maintaining isolation performance
Solution Approach 2:
The patent employs dynamic switching mechanisms that can reconfigure the circuit topology based on operating frequency, enabling a single chip to adapt to multiple frequency bands without requiring separate duplexers for each band
2Ease of manufacture
If on-chip cancellation circuits are used to provide isolation, then integration is improved, but circuit complexity increases due to impedance matching requirements
Solution Approach 1:
The cancellation circuits are designed to automatically track and compensate for antenna impedance variations without requiring external impedance matching networks or complex tuning mechanisms, thereby simplifying the overall circuit design while maintaining integration benefits
3Reliability
If dummy loads are used for impedance matching in cancellation circuits, then isolation is improved, but power loss increases
Solution Approach 1:
The patent converts the previously harmful reflected power from impedance mismatches into a useful signal component that can be cancelled through the intelligent circuit design, eliminating the need for dissipative dummy loads and reducing power loss while maintaining isolation performance
4Reliability
If fixed frequency duplexers are used, then isolation at specific frequencies is improved, but adaptability to multiple frequency bands decreases
Solution Approach 1:
The patent designs a universal isolation mechanism using switching circuits and可调 components that can be reconfigured to provide effective isolation across multiple frequency bands, enabling a single chip to serve multiple communication standards and frequency ranges
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
This solution provides efficient and area-saving isolation between transmitter and receiver, reducing power loss and eliminating the need for tracking antenna impedance changes, while being tunable and suitable for multiple frequency bands, thus improving the performance and efficiency of communication devices.
Implementation Method 1
At least one of the transmit frequency blocking arrangement and the receive frequency blocking arrangement comprises a network of passive components comprising at least one transformer
Implementation Method 2
filter arrangements adapted to have a higher impedance value in the blocking frequency interval than in the non-blocking frequency interval
Data Source
AI summary
A transceiver front-end of a communication device comprises a frequency blocking arrangement, which may be either a transmit frequency blocking arrangement or a receive frequency blocking arrangement. The frequency blocking arrangement has a blocking frequency interval associated with one of a transmit frequency and receive frequency, and a non-blocking frequency interval associated with the other of the transmit frequency and receive frequency. The frequency blocking arrangement is configured to block passage of signals in the blocking frequency interval between said signal transmission and reception node and either said receiver node or said transmitter node. The frequency blocking arrangement comprises a network of passive components comprising at least one transformer and a filter arrangement adapted to have a higher impedance value in the blocking frequency interval than in the non-blocking frequency interval.