Common Light Sensing Circuit for Synchronous Color Signal Detection
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Solution Overview
Problem
Conventional optical sensors face challenges in simultaneously sensing multiple color light signals due to the need for multiple analog-to-digital converters, which increases space occupation and costs, and results in errors due to prolonged sensing intervals.
Innovation Solution
A common light sensing circuit with a plurality of gain amplifiers, an arithmetic circuit, an analog-to-digital converter circuit, and a counter circuit that amplifies and combines photocurrents from multiple photoelectric components, allowing for synchronous sensing of multiple color light signals using a single or fewer analog-to-digital converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple analog-to-digital converters are used to sense multiple color light signals simultaneously, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple analog-to-digital conversion functions into a single shared ADC resource. Multiple photoelectric components (first photoelectric component and second photoelectric component) convert different color light signals to photocurrents, which are then amplified by gain amplifiers and combined through arithmetic circuits. The single ADC sequentially converts these combined analog signals to digital signals, eliminating the need for multiple separate ADCs while maintaining synchronous sensing capability.
Solution Approach 2:
The single analog-to-digital converter is designed to serve multiple functions by sequentially processing signals from different photoelectric components. The ADC acts as a universal conversion resource that handles conversion for the first photoelectric component, then the second photoelectric component, and potentially other components, replacing what would traditionally require dedicated ADCs for each component.
2Measurement precision
If multiple analog-to-digital converters are used to sense multiple color light signals simultaneously, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple analog-to-digital conversion functions into a single shared ADC resource. Multiple photoelectric components (first photoelectric component and second photoelectric component) convert different color light signals to photocurrents, which are then amplified by gain amplifiers and combined through arithmetic circuits. The single ADC sequentially converts these combined analog signals to digital signals, eliminating the need for multiple separate ADCs while maintaining synchronous sensing capability.
3Device complexity
If sequential sensing of multiple color light signals is used to reduce circuit complexity, then device complexity is reduced, but measurement precision deteriorates due to time intervals
Solution Approach 1:
The patent implements periodic action through time-division multiplexing where the single ADC sequentially and periodically converts analog signals from different photoelectric components at different time intervals. The first ADC conversion process handles the first photoelectric component, then the second ADC conversion process handles the second photoelectric component. This periodic sequential conversion maintains circuit simplicity while achieving accurate measurements by capturing signals in rapid succession.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous and accurate synchronous sensing of multiple color light signals, reducing errors from environmental changes and minimizing the space and cost associated with analog-to-digital converter circuits.
Implementation Method 1
The plurality of photoelectric components respectively convert the plurality of color light signals into a plurality of photocurrents
Data Source
AI summary
An optical sensor having a common light sensing circuit for synchronously sensing a plurality of color light signals is provided. A plurality of photoelectric components respectively convert the plurality of color light signals into a plurality of photocurrents. A plurality of gain amplifiers respectively multiply the plurality of photocurrents by a plurality of gains to output a plurality of amplified photocurrents. An arithmetic circuit adds up the plurality of amplified photocurrents to output a total amplified photocurrent signal. A common analog-to-digital converter converts the total amplified photocurrent signal into a digital signal. A counter circuit counts bit values of the digital signal to output a counting signal.