Silicon Duplexer Circuit for RF Transceiver Isolation
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Solution Overview
Problem
Current radio transceivers face challenges in achieving adequate isolation between transmitter and receiver signals, particularly in full-duplex mode, due to the need for separate duplexers for multiple frequency bands, which increases size and cost, and cannot be fabricated using silicon-based technology.
Innovation Solution
A silicon-based duplexer functional circuit is implemented on the same integrated circuit as the transceiver, utilizing a multiple node isolation and coupling circuit with a balancing circuit and transformer or auto-transformer configurations to provide isolation, allowing for on-chip operation across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate duplexers are used for multiple frequency bands, then RX/TX isolation is improved, but device size and cost increase
Solution Approach 1:
The patent combines multiple frequency band handling into a single duplexer circuit by integrating a frequency selection mechanism. Instead of using separate duplexers for each frequency band, the system uses one duplexer with the capability to select and operate at multiple frequency bands through integrated circuitry, thereby reducing device size while maintaining isolation performance.
Solution Approach 2:
The duplexer is designed to be multi-functional by incorporating frequency selection capabilities that allow it to operate across multiple frequency bands. This universal design enables a single duplexer to replace what would traditionally require multiple separate duplexers, achieving space savings while maintaining the necessary RX/TX isolation for each band.
2Reliability
If separate duplexers are used for multiple frequency bands, then RX/TX isolation is improved, but manufacturing cost increases
Solution Approach 1:
By merging multiple frequency band functions into a single integrated duplexer circuit, the patent reduces the total component count and assembly complexity. This integration lowers manufacturing costs through reduced parts procurement, simplified assembly processes, and smaller bill of materials, while maintaining the required isolation performance across all frequency bands.
Solution Approach 2:
The universal duplexer design that handles multiple frequency bands reduces the need for separate components for each band, thereby lowering overall manufacturing costs. The integrated frequency selection capability allows a single component to perform what would otherwise require multiple specialized components, reducing material costs and assembly expenses.
3Ease of manufacture
If silicon-based technology is used for duplexer, then ease of manufacture is improved, but RX/TX isolation performance deteriorates
Solution Approach 1:
The patent achieves adequate RX/TX isolation using silicon-based technology by optimizing circuit parameters such as quality factor (Q), impedance matching, and frequency selection. Through careful parameter tuning and design optimization, the system attains sufficient isolation performance (e.g., 35-40 dB) for modern communication standards, making silicon-based fabrication viable despite traditionally lower isolation compared to ceramic or SAW technologies.
Solution Approach 2:
The invention uses integrated circuit techniques to replicate the isolation function traditionally achieved by discrete ceramic or SAW duplexers. By implementing the isolation functionality through silicon-based circuit design and optimization, the system achieves comparable performance to traditional materials while benefiting from the manufacturing advantages of semiconductor fabrication processes.
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 enables efficient signal isolation between transmitter and receiver, reducing interference and size, while allowing for compact, cost-effective implementation of full-duplex transceivers across multiple frequency bands.
Implementation Method 1
utilizing a multiple node isolation and coupling circuit with a balancing circuit and transformer or auto-transformer configurations to provide isolation
Data Source
AI summary
A radio frequency (RF) transceiver front-end includes an antenna, an RF receiver section, an RF transmitter section, a balancing circuit, and a multiple node isolation and coupling circuit. The multiple node isolation and coupling circuit is coupled to the antenna, the RF receiver section, the RF transmitter section, and the balancing circuit. The multiple node isolation and coupling circuit provides an inbound RF signal from the antenna to the RF receiver section and provides an outbound RF signal from the RF transmitter section to the antenna, wherein, by providing an isolating signal to the balancing circuit, the multiple node isolation and coupling circuit substantially isolates the outbound RF signal from the inbound RF signal.