Random Clock Generator Feedback for Low-EMI Switching Amplifiers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Switching amplifiers generate high-frequency pulse signals that cause electromagnetic interference, leading to distortion issues, and existing solutions like low-pass filters increase cost and space while compromising efficiency.
Innovation Solution
A spread spectrum device with a random clock generator that uses a random number generator, reference wave generator, and trigger signal generator to produce a triangular wave with feedback control, maintaining linearity and reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low-pass filters are added to filter out high frequency parts, then electromagnetic interference is reduced, but cost and space increase dramatically
Solution Approach 1:
The patent extracts the harmful high-frequency components from the output signal by using a feedback mechanism that detects and corrects distortion caused by electromagnetic interference, rather than physically filtering them out with expensive low-pass filters. The feedback circuit removes the harmful frequency components through signal processing rather than physical filtration.
Solution Approach 2:
The patent replaces the mechanical/physical low-pass filter system with an electronic feedback control system. Instead of using physical components to block high frequencies, the system uses electronic detection and correction mechanisms to achieve the same electromagnetic interference reduction without the associated cost and space penalties.
2Object-affected harmful factors
If spread spectrum is used to randomly vary operational frequency, then electromagnetic compatibility requirements are met, but linearity of triangular wave deteriorates causing distortion
Solution Approach 1:
The patent introduces a feedback control mechanism that monitors the triangular wave generation process and dynamically adjusts parameters to maintain linearity even when spread spectrum frequency variation is applied. The feedback circuit detects distortion and corrects it in real-time, allowing the system to benefit from spread spectrum's electromagnetic compatibility improvements while compensating for the resulting linearity degradation.
Solution Approach 2:
The patent dynamically changes operational parameters of the triangular wave generator in response to spread spectrum frequency variations. By adjusting parameters such as amplitude, frequency, and timing based on feedback signals, the system maintains wave linearity across the varying frequency range required for spread spectrum operation.
Data Source
AI summary
A random clock generator for a spread spectrum modulating device includes a random number generator for generating a plurality of random number signals according to a first square wave signal and a control signal, a reference wave generator coupled to the random number generator for generating a triangular signal and a second square wave signal according to the plurality of random number signals, and a trigger signal generator coupled to the random number generator and the reference wave generator, for generating the first square wave signal according to the second square wave signal.