Spread Spectrum Clock Circuit for EMI Suppression Without Shutdown
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Solution Overview
Problem
Existing clock signal generation circuits in electronic devices face challenges in suppressing electromagnetic interference (EMI) without disrupting normal operation, as current methods require shutting down the device and are inflexible in adjusting modulation depth and center frequency.
Innovation Solution
A clock signal generation circuit comprising a control word generation circuit, an initial clock generation circuit, and a spread spectrum clock generation circuit that generates frequency control words based on spread spectrum parameters, allowing for real-time adjustment of modulation depth and center frequency to achieve spread spectrum processing without affecting device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread spectrum processing is performed using traditional phase-locked loop circuits with jitter, then electromagnetic interference is suppressed, but the device must be shut down and flexibility in adjusting modulation depth and center frequency is lost
Solution Approach 1:
The patent replaces the traditional mechanical/electrical phase-locked loop circuit with a digital signal processing approach. The spread spectrum processing is performed entirely in the digital domain using a field-programmable gate array (FPGA) or digital signal processor (DSP), which allows flexible adjustment of modulation depth and center frequency through software configuration rather than hardware changes. This digital substitution enables the system to maintain EMI suppression while gaining adaptability.
Solution Approach 2:
The patent implements dynamic parameter adjustment capabilities where modulation depth and center frequency can be changed in real-time through digital control. The system allows users to programmatically modify spread spectrum parameters without requiring device shutdown or hardware reconfiguration, enabling adaptive EMI suppression tailored to different operating conditions and regulatory requirements.
2Object-affected harmful factors
If traditional spread spectrum methods are used, then electromagnetic interference is suppressed, but device operation is disrupted and power consumption increases
Solution Approach 1:
The patent replaces traditional analog spread spectrum implementation with digital signal processing. The digital approach allows the spread spectrum function to be applied to individual clock signals independently, enabling continuous device operation without shutdown. The digital processing can be integrated into the existing clock generation architecture, maintaining productivity while achieving EMI suppression.
3Object-affected harmful factors
If traditional spread spectrum circuits are implemented, then electromagnetic interference is suppressed, but device complexity and power consumption increase
Solution Approach 1:
The patent implements a universal digital processing platform (FPGA or DSP) that can perform multiple functions including spread spectrum processing, clock generation, and signal synthesis. This multi-functional approach consolidates what would otherwise require separate dedicated circuits, reducing overall device complexity while maintaining EMI suppression capabilities.
Solution Approach 2:
The patent merges the spread spectrum processing function with the existing clock generation and signal processing circuits. By integrating the spread spectrum algorithm into the digital signal processing pipeline rather than adding separate hardware circuits, the system achieves EMI suppression without proportionally increasing device complexity.
Data Source
AI summary
Provided is a clock signal generation circuit. The clock signal generation circuit includes a control word generation circuit, an initial clock generation circuit and a spread spectrum clock generation circuit, wherein the control word generation circuit is connected to the initial clock generation circuit and the spread spectrum clock generation circuit; the initial clock generation circuit is further connected to the spread spectrum clock generation circuit.