ADC Sampling Frequency Control for Water-Wave Noise
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Solution Overview
Problem
Existing digital image systems face quality issues due to water-wave noise generated by periodic interference during analog to digital conversion, which current methods like layout modification and time division multiplexing often fail to address effectively, especially in miniaturized electronic products.
Innovation Solution
A method and system that adjust the sampling frequency and/or noise frequency to prevent water-wave noise by determining the presence of periodic interference and ensuring the sampling frequency and noise frequency satisfy specific integer relationships to eliminate the noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If layout modification or time division multiplexing is used to prevent water-wave noise, then noise interference is reduced, but system complexity increases and performance deteriorates
Solution Approach 1:
The patent changes the frequency parameter of the periodic noise by adjusting the clock signal frequency to be non-integer related to the sampling frequency. This parameter change eliminates water-wave noise without requiring layout modification or time division multiplexing, thus reducing system complexity while maintaining noise reduction effectiveness.
2Manufacturing precision
If sampling frequency is adjusted to eliminate water-wave noise, then image quality improves, but conversion efficiency may be reduced
Solution Approach 1:
The patent adjusts the sampling frequency or clock frequency to specific values that eliminate water-wave noise while maintaining acceptable conversion efficiency. By changing these frequency parameters, the system achieves both high image quality and maintained productivity without requiring complex additional processing.
Data Source
AI summary
A method of reducing a water-wave noise for an analog to digital conversion includes performing sampling on an analog input signal; determining whether the analog input signal is interfered with by a periodic noise such that a water wave is generated; and executing one or both of the following steps when the analog input signal is interfered with by the periodic noise: adjusting a sampling frequency of the ADC, and adjusting a noise frequency of the periodic noise.