Dynamic Clocking Architecture for RF Subsystem EMI Reduction
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Solution Overview
Problem
The integration of RF, BB, and PMU components in a single chip leads to EMI issues, particularly desensitization of the RF receiver due to wideband noise from digital components like cameras, displays, and USB interfaces, which existing solutions like differential wiring and flip chip packages cannot fully mitigate without increasing design and manufacturing costs.
Innovation Solution
Implementing a dynamic clocking architecture using a programmable frequency divider and a Use Case Manager to adjust the clock rate of components generating wideband noise, positioning the noise PSD null just to the left or right of the RF transceiver's carrier frequency, thereby minimizing desensitization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RF, BB, and PMU components are integrated in a single chip, then manufacturing cost is reduced, but EMI issues arise causing desensitization of the RF receiver
Solution Approach 1:
The patent applies dynamic clock rate adjustment based on operational context. The Use Case Manager dynamically modifies the clock rate of digital components (cameras, displays, USB interfaces) depending on whether the RF receiver is in use or not, thereby reducing EMI emissions only when necessary while maintaining performance when interference is not an issue.
Solution Approach 2:
The patent changes the operating parameter (clock rate) of digital components to reduce their electromagnetic emissions. By adjusting the clock rate of components like cameras, displays, and USB interfaces, the system reduces the wideband noise generation that causes RF receiver desensitization while maintaining functional operation.
2Object-affected harmful factors
If differential wiring and flip chip packages are used to mitigate EMI, then RF receiver protection is improved, but design and manufacturing costs increase
Solution Approach 1:
The system uses self-service by having the Use Case Manager automatically detect operational context and adjust clock rates without requiring external intervention. This software-based approach replaces the need for complex hardware shielding and specialized packaging, reducing manufacturing costs while maintaining EMI protection.
3Object-affected harmful factors
If clock rate of digital components is dynamically adjusted, then wideband noise impact on RF receiver is reduced, but system complexity increases
Solution Approach 1:
The Use Case Manager serves multiple functions: it monitors operational context, determines when EMI reduction is needed, calculates appropriate clock rate adjustments, and coordinates with various digital components. This multi-functional approach consolidates complexity into a single management entity rather than requiring separate control mechanisms for each component.
Data Source
AI summary
A method for dynamically clocking one component located into a Wireless telecommunication apparatus comprising a RF transceiver subject to desensizitation by said component EMI, characterized in that it involves the steps of performing an adaptive control on the clock rate of said component so as to locate a wideband noise PSD null just to the left or to the right, in the frequency domain, of the RF transceiver wanted carrier frequency (fw) Particularly, the control is performed by means of the control of programmable frequency dividers, and under the control of a general control unit (UCM) for the purpose of performing a contextual analysis of the current mode of operation of said wireless telecommunications and, in response to said contextual analysis, for determining the fine tuning of the clock rate to be applied to said component.