Spread Spectrum Clock Depth Tuning for Wide-Range EMI Suppression
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Solution Overview
Problem
Traditional clock generators face limitations in achieving large dynamic frequency ranges without affecting circuit operation, leading to restricted spread spectrum depth coefficients and boundary types, which inadequately address electromagnetic interference (EMI) in high-frequency clock signals.
Innovation Solution
A parameter determination method for spread spectrum circuits that adjusts the base time unit and determines a spread spectrum depth coefficient, allowing for a standard frequency control word and enabling a clock spread spectrum method with TAF-DPS technology to generate a spread spectrum clock signal with flexible boundary selection, maximizing spread spectrum depth without compromising clock quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional clock generators are used to generate clock signals, then the circuit operation is stable, but the frequency dynamic range is limited and spread spectrum depth coefficient is restricted
Solution Approach 1:
The patent implements dynamic frequency adjustment by introducing a spread spectrum clock generation mechanism that dynamically modulates the clock frequency around a nominal value. The frequency control word is dynamically adjusted based on spread spectrum depth coefficients, enabling the clock generator to adaptively change frequency within a controlled range while maintaining circuit operation stability through bounded modulation.
Solution Approach 2:
The patent changes the frequency parameter of the clock signal by introducing spread spectrum depth coefficients that modify the frequency control word. This allows the system to achieve large frequency dynamic ranges by adjusting the spread spectrum depth parameter, while the nominal frequency remains stable, thus resolving the contradiction between frequency adaptability and operational stability.
2Object-generated harmful factors
If spread spectrum depth coefficient is increased to improve EMI inhibition, then electromagnetic interference is reduced, but clock quality may be compromised
Solution Approach 1:
The patent applies partial action by using spread spectrum modulation that disperses energy across a frequency range rather than concentrating it at a single frequency. The frequency control word is adjusted by a spread spectrum depth coefficient that provides sufficient EMI inhibition while maintaining clock quality within acceptable bounds, avoiding excessive frequency modulation that would degrade clock performance.
Solution Approach 2:
The patent ensures continuous useful action by maintaining the clock signal's nominal frequency as the center of the spread spectrum modulation. The frequency control word continuously varies around the nominal value with a controlled deviation determined by the spread spectrum depth coefficient, ensuring both EMI reduction through spectral dispersion and clock quality maintenance through continuous operation near the nominal frequency.
3Adaptability or versatility
If frequency control word is adjusted to achieve large frequency dynamic range, then adaptability is improved, but measurement precision of frequency control is reduced
Solution Approach 1:
The patent introduces an additional dimension of control by separating the frequency control into two components: a nominal frequency determined by the base frequency control word and a dynamic adjustment determined by the spread spectrum depth coefficient. This dimensional separation allows the system to achieve large frequency dynamic ranges through the spread spectrum parameter while maintaining precise control over the nominal frequency, thus resolving the precision-adaptability contradiction.
Data Source
AI summary
A parameter determination method for a spread spectrum circuit, a clock spread spectrum method, a parameter determination device for a spread spectrum circuit, and a clock spread spectrum device are disclosed. The parameter determination method for the spread spectrum circuit includes: obtaining a base time unit and a target frequency; determining a spread spectrum depth coefficient according to the base time unit and the target frequency; determining whether the spread spectrum depth coefficient is greater than or equal to a base spread spectrum depth coefficient; if yes, determining the spread spectrum depth coefficient as a standard spread spectrum depth coefficient and determining a standard frequency control word according to the standard spread spectrum depth coefficient; and if no, adjusting the base time unit until a corresponding spread spectrum depth coefficient corresponding to the base time unit is greater than or equal to the base spread spectrum depth coefficient.