Adaptive Grounding for Mixed-Signal RF Noise Mitigation
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Solution Overview
Problem
Unwanted signal coupling between RF and analog/digital control sections in mixed-signal devices leads to noise and degraded RF performance, which conventional shielding methods fail to adequately address.
Innovation Solution
The implementation of adaptive grounding techniques using multiple ground paths and switches that selectively connect the control section to the ground connection, ensuring that the path farthest from active RF signal paths is used to minimize inductive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional shielding is used to prevent signal coupling, then some protection is provided, but RF devices closest to the analog control section still have degraded performance
Solution Approach 1:
The patent implements dynamic grounding by using switches to selectively connect different ground paths based on which RF components are active. The system transitions from static shielding to adaptive grounding that changes configuration in real-time, connecting the control section to ground paths farthest from active RF signals to minimize coupling while maintaining RF performance.
Solution Approach 2:
The system changes the grounding configuration parameter dynamically by selecting different ground paths based on RF signal activity. Multiple ground paths are provided with different spatial relationships to RF components, and the system switches between them to optimize the distance between ground connections and active RF signals, thereby minimizing inductive coupling.
2Object-affected harmful factors
If multiple ground paths are provided with switches for selective connection, then noise coupling is significantly reduced, but device complexity increases
Solution Approach 1:
The grounding system is segmented into multiple separate ground paths, each with different spatial relationships to RF components. This segmentation allows the system to isolate the control section from specific RF signals by selecting appropriate ground paths, reducing noise coupling through spatial separation while managing complexity through modular design.
Solution Approach 2:
Switches serve as intermediaries between the control section and multiple ground paths. These intermediary elements enable dynamic selection of the optimal ground path based on RF signal activity, providing intelligent noise mitigation while maintaining a manageable device architecture through automated control.
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 approach significantly reduces noise coupling, improving RF performance by over 20 dB and preventing harmonic generation, thereby enhancing the overall signal integrity and reducing interference between RF and control sections.
Implementation Method 1
selectively connect one of the at least two ground paths to the ground connection... ensuring that the path farthest from active RF signal paths is used to minimize inductive coupling
Data Source
AI summary
Methods and apparatus for providing adaptive grounding in mixed-signal electronic dies, circuits, modules, or other devices. In one example a module in which adaptive grounding is implemented includes a substrate having disposed thereon a plurality of signal contacts and a ground connection, and a mixed-signal die disposed on the substrate and including a signal section and a control section, the signal section having a plurality of radio frequency components each connected to a respective one of the plurality of signal contacts on the substrate by a corresponding signal connector, and the control section having at least two ground paths that selectively connect the control section to the ground connection on the substrate and which are physically spaced apart from one another, the mixed-signal die further including at least two switches, each operable to selectively connect one of the ground paths to the ground connection.