Dual RF Connection Circuit With Filtered Port Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly with the advent of 5G networks, the challenge of securing adequate isolation between ports in RFICs to prevent sensitivity degradation and reception performance loss due to induced transmission signals is exacerbated by increased signal bandwidth and complex modulation schemes, leading to issues like spurious noise and intermodulation distortion.
Innovation Solution
The implementation of filters in the RFFE to selectively remove induced transmission signals, ensuring that only intended radio frequency signals are input to the appropriate RFFE, thereby maintaining isolation and preventing reception performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between ports of the switch is increased to raise isolation between ports, then isolation performance is improved, but component size increases
Solution Approach 1:
A filter is introduced as an intermediary component between the RFIC and the first RFFE. This filter selectively removes the induced transmission signal from the path to the first RFFE, effectively mediating the isolation problem without requiring physical distance increases. The filter acts as a signal processing mediator that cleans the signal path.
Solution Approach 2:
The signal path is segmented into separate processing channels: one path goes directly from RFIC to second RFFE for transmission, while another path goes from RFIC through a filter to first RFFE for reception. This segmentation allows independent optimization of each path, with the filter specifically addressing the isolation requirement for the reception path.
2Reliability
If the switch inner implementation structure is changed to raise isolation between ports, then isolation performance is improved, but the number of transistors increases and manufacturing complexity increases
Solution Approach 1:
Instead of modifying the complex internal structure of the switch, a filter is introduced as an external intermediary component. This filter handles the isolation function by selectively removing unwanted signals, thereby avoiding the need to increase the number of transistors or complicate the switch's internal architecture.
Solution Approach 2:
The isolation function is extracted from the switch component itself and placed into a separate filter component. This extraction allows the switch to maintain its simple structure while the filter independently provides the necessary signal separation and isolation performance.
3Power
If the output power of the RFIC or the gain of the amplifier is increased to increase transmission signal power, then transmission signal power is improved, but current consumption increases and linearity degrades
Solution Approach 1:
The induced transmission signal, which was previously a harmful interference causing isolation problems, is now beneficially utilized. By removing only the induced portion through the filter while preserving the desired signal, the system can maintain lower RFIC output power and amplifier gain, thereby reducing current consumption and improving linearity while still achieving adequate transmission performance.
Data Source
AI summary
Various embodiments of the disclosure disclose a method and apparatus, comprising: a communication processor; a radio frequency integrated circuit (RFIC) connected to the communication processor and outputting at least one of a first radio frequency signal, a second radio frequency signal, a third radio frequency signal, and a fourth radio frequency signal; a first circuit connected to the RFIC and including a first filter; a first radio frequency front end (RFFE) connected to the first circuit and including a first amplifier configured to amplify the first radio frequency signal and/or the third radio frequency signal; and a second RFFE including a second amplifier configured to amplify the second radio frequency signal and/or the fourth radio frequency signal output from the RFIC, wherein the communication processor is configured to control the first circuit to remove the fourth radio frequency signal induced to the first circuit through the first filter.