Spread Spectrum Clock Rate Shaping for EMI-Sensitive Time Windows
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Solution Overview
Problem
Spread spectrum clock signals, while reducing electromagnetic interference (EMI) compared to fixed frequency signals, still cause increased EMI within specific time ranges, thereby reducing system reliability.
Innovation Solution
A spread spectrum clock generator and method that dynamically adjusts the frequency change rate of the clock signal using multiple frequency change rates, with an initial rate greater than the rate within a target time range, to reduce EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread spectrum clock signal is used, then electromagnetic interference is reduced compared to fixed frequency signal, but electromagnetic interference increases within specific time range
Solution Approach 1:
The patent applies dynamics by making the frequency change rate adjustable rather than fixed. The frequency control circuit dynamically modifies the frequency change rate of the spread spectrum clock signal based on different time ranges, transitioning from a static system to a dynamic one that can adapt its characteristics to reduce EMI at critical moments while maintaining spread spectrum benefits during other periods
Solution Approach 2:
The patent implements parameter changes by modifying the frequency change rate parameter of the spread spectrum clock signal. The frequency control circuit changes this parameter according to time ranges, creating different operational modes that balance EMI reduction with system reliability requirements
Data Source
AI summary
A spread spectrum clock generator, a memory storage device, and a spread spectrum clock generation method are provided. The method includes: generating a spread spectrum clock signal according to a reference clock signal and a control signal; and adjusting the control signal to change a frequency of the spread spectrum clock signal based on multiple frequency change rates, wherein an initial frequency change rate of the spread spectrum clock is greater than a frequency change rate of the spread spectrum clock within a target time range.