Optical Sensor Signal Conversion With Parallel Channels for Low-Noise Range
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Solution Overview
Problem
Optical monitoring systems for semiconductor processes face challenges in achieving high dynamic range and noise performance, particularly in detecting small changes in optical signals due to increased noise from operating outside temperature ranges and thermal fluctuations, which can lead to false results and data corruption.
Innovation Solution
The system includes an optical sensor with a conversion system featuring multiple parallel signal channels, an analog switch, and an analog-to-digital converter, synchronized with an external sync signal to select and convert electrical signals into digital outputs, and a thermal monitoring system that warns of potential data corruption by tracking cooling system parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single signal channel is used for conversion, then device complexity is reduced, but dynamic range and noise performance deteriorate
Solution Approach 1:
The conversion circuitry is divided into multiple parallel signal channels (e.g., multiple ADCs processing separate signal paths). Each channel can be independently optimized for different signal ranges and noise characteristics, allowing the system to handle both small and large signal variations with high precision while maintaining manageable complexity through modular architecture
Solution Approach 2:
The system transitions from a single-dimensional signal conversion path to a multi-dimensional parallel channel architecture. By processing signals through multiple concurrent channels with different gain settings and noise profiles, the system expands the dynamic range capability without proportionally increasing overall system complexity
2Reliability
If thermal monitoring is added to monitor cooling system parameters, then data reliability is improved, but device complexity increases
Solution Approach 1:
Thermal monitoring sensors provide continuous feedback on cooling system performance and optical sensor temperature. This feedback loop enables real-time detection of thermal conditions that could compromise data integrity, allowing the system to alert operators or adjust operations before data corruption occurs, thereby improving reliability through proactive thermal management
Solution Approach 2:
The thermal monitoring system detects potential thermal issues before they cause data corruption. By continuously monitoring cooling system parameters and predicting thermal problems in advance, the system can take preventive actions (such as alerting operators or adjusting operational parameters) before data integrity is compromised
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
This configuration enhances data quality by reducing noise, improving signal-to-noise ratio, and preventing data corruption by synchronizing signal processing with plasma modulation and monitoring thermal conditions, ensuring accurate monitoring of semiconductor processes.
Implementation Method 1
an optical sensor configured to receive an optical input and convert the optical input to electrical signals
Data Source
AI summary
The disclosure provides an optical instrument, a method of converting an optical input to a digital signal output, and a spectrometer. In one embodiment, the optical instrument includes: (1) an optical sensor configured to receive an optical input and convert the optical input to electrical signals, and (2) a conversion system having conversion circuitry having multiple parallel signal channels that are configured to receive and modify the electrical signals to analog outputs, an analog switch configured to select one of the parallel signal channels according to an operating mode of the optical instrument, and an analog to digital converter configured to receive and convert the analog output from the selected parallel signal channel to a digital signal output.