Avalanche Photodiode Pulse Conversion for Multi-Voltage Integration
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Solution Overview
Problem
Existing photoelectric conversion apparatuses face challenges in achieving high integration and speed while managing different power supply voltages for photodiode and circuit units, with limited discussion on configurations using multiple power supply voltages.
Innovation Solution
A photoelectric conversion apparatus is designed with a diode of avalanche amplification type, pulse shaping and conversion circuits, and signal processing circuits, utilizing multiple power supply voltages to optimize signal processing and integration, where the difference between the first and second power supply voltages is greater than the difference between the third and fourth power supply voltages, allowing for efficient pulse signal conversion and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power supply voltages are used for photodiode and circuit units, then integration and speed are improved, but power supply management complexity increases
Solution Approach 1:
The photoelectric conversion apparatus is divided into distinct units with different power supply requirements: a photodiode unit operating at a first power supply voltage and a circuit unit operating at a second power supply voltage. This segmentation allows each unit to be optimized independently for its specific function while managing power supply complexity through clear separation of voltage domains.
Solution Approach 2:
Different regions of the apparatus are assigned different power supply voltages according to their specific operational needs. The photodiode unit receives a first power supply voltage optimized for photoelectric conversion, while the circuit unit receives a second power supply voltage optimized for signal processing, thereby achieving local optimization of performance while maintaining overall system integration.
2Power
If avalanche amplification diode is used, then signal amplification is improved, but noise and power consumption increase
Solution Approach 1:
The avalanche amplification diode operates in a dynamic regime where high voltage is applied only during the photoelectric conversion phase to generate amplified signals, while the circuit unit processes these signals at a lower, stable voltage level. This dynamic power management allows signal amplification when needed while reducing continuous power consumption and associated noise in the processing stages.
Solution Approach 2:
The apparatus separates the high-power avalanche amplification function into a dedicated photodiode unit from the lower-power signal processing circuit unit. This segmentation confines the high energy consumption and noise generation to the photoelectric conversion stage only, while the subsequent processing stages operate with reduced power and noise, improving overall signal-to-noise ratio.
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 the integration and speed of the photoelectric conversion apparatus by effectively managing multiple power supply voltages, ensuring reliable pulse signal processing and output, thereby improving the overall performance and reliability of the system.
Implementation Method 1
a diode of avalanche amplification type
Data Source
AI summary
A photoelectric conversion apparatus includes a pulse shaping circuit that shapes an output from a diode of avalanche amplification type into a pulse, and a pulse conversion circuit that converts a pulse signal output from the pulse shaping circuit. The pulse conversion circuit converts a pulse signal having a first amplitude and output from the pulse shaping circuit into a pulse signal having a second amplitude smaller than the first amplitude.