Aggressor IC Frequency Configuration for Spur-Safe Victim Bands
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Solution Overview
Problem
In electronic devices, spurs generated by one integrated circuit (IC) can interfere with the operation of another IC, leading to degradation of signal-to-noise ratio and mixing of undesirable noise, as existing techniques like frequency planning and clock spreading are often insufficient to mitigate these interferences effectively.
Innovation Solution
A first IC identifies frequencies to be protected and sends protection information to a second IC, which configures its operations to avoid generating spurs that interfere with these frequencies, prioritizing the protection of critical frequencies based on their importance to the victim IC's functional performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency planning and clock spreading techniques are used to mitigate spurs, then some spur interference is reduced, but the interference is not sufficiently mitigated to avoid degradation of signal-to-noise ratio at the victim circuit
Solution Approach 1:
The victim IC performs frequency analysis on its received signals to identify spur frequencies in advance, then sends protection information to the aggressor IC before the interference occurs. This allows the aggressor IC to proactively adjust its operating parameters to avoid generating harmful spurs, rather than reacting after interference has already degraded the signal-to-noise ratio.
Solution Approach 2:
The system establishes a feedback loop where the victim IC continuously monitors its signal quality, identifies spur frequencies, and communicates this information back to the aggressor IC. The aggressor IC then adjusts its operating parameters based on this feedback to eliminate the spurs, creating a closed-loop control system that dynamically maintains signal-to-noise ratio above acceptable thresholds.
2Adaptability or versatility
If multiple ICs operate in close physical proximity with multiple operating frequencies, then functional integration is achieved, but spur generation from one IC interferes with another IC's operation
Solution Approach 1:
Protection information acts as an intermediary mechanism between the victim IC and aggressor IC. The victim IC analyzes its signal characteristics and communicates protected frequency ranges to the aggressor IC through this intermediary information channel. The aggressor IC then uses this information to select operating parameters that avoid generating spurs in the protected frequencies, enabling multiple ICs to coexist without direct interference.
Solution Approach 2:
The aggressor IC dynamically changes its operating parameters (such as clock frequencies, modulation schemes, or transmission power) based on protection information received from the victim IC. By adjusting these parameters, the aggressor IC shifts its operating characteristics to avoid generating spurs that would interfere with the victim IC's frequency bands, thus maintaining functional integration while eliminating harmful interactions.
Data Source
AI summary
Embodiments relate to identifying frequencies to be protected at a victim integrated circuit (IC) and sending protection information including the identified frequencies to an aggressor IC. The aggressor IC configures its subsystems or circuits to operate using operating frequencies that prevents spurs that may interfere with the frequencies identified in the protection information. If not all of the frequencies in the protection information can be protected, the aggressor IC selects a subset of the frequencies to be protected. Then, the aggressor IC configures the operating frequencies of its subsystems or circuits so that spurs that they generate do not interfere with the selected frequencies.