Semiconductor Device Frequency Dispersion for EMI Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor devices in vehicle mount video systems struggle to sufficiently reduce Electromagnetic Interference (EMI) across various input signals, especially when analog signals are displayed without frequency dispersion processing.
Innovation Solution
The semiconductor device incorporates a processing unit that selectively performs frequency dispersion on input signals, generating a display clock with dispersed frequency to reduce EMI, and outputs the processed signals to a display unit, ensuring effective EMI reduction regardless of signal type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency dispersion processing is applied to reduce EMI, then EMI reduction is improved, but device complexity increases
Solution Approach 1:
The patent applies frequency dispersion processing by changing the frequency parameter of the display clock signal. The processing unit deliberately introduces frequency variations or offsets to the clock signal, which disperses the electromagnetic energy across a broader frequency spectrum, thereby reducing peak EMI levels while maintaining display functionality.
Solution Approach 2:
The patent introduces a dedicated processing unit as an intermediary component between the signal source and display unit. This processing unit specifically handles frequency dispersion processing of the display clock signal, isolating the EMI reduction function from other system components and managing complexity through functional specialization.
2Object-affected harmful factors
If frequency dispersion processing is applied to all input signals, then EMI reduction is improved, but processing time increases
Solution Approach 1:
The patent applies frequency dispersion processing selectively rather than uniformly to all signals. The processing unit targets specifically the display clock signal that causes EMI issues, while other signals may bypass or receive reduced processing. This partial application approach achieves sufficient EMI reduction without unnecessarily increasing processing time for all signals.
Data Source
AI summary
A semiconductor device includes a first input unit for receiving a first signal; a first processing unit configured to perform a frequency dispersion processing on the first signal; a first output unit configured to output the first signal or the first signal on which the first processing unit performs the frequency dispersion processing; a second input unit configured to receive a second signal generated through performing a predetermined image processing with an image processing unit on the first signal output from the first output unit; a second processing unit configured to perform the frequency dispersion processing on the second signal; an enable signal input unit configured to receive an enable signal; and a second output unit configured to output one of the first signal and the second signal as an output signal according to the enable signal.