Feedback Output Circuit for Weak Signal Vision Sensing
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Solution Overview
Problem
Sensing elements in event-based vision sensors struggle to detect weak signals, leading to insufficient amplification and ineffective data output.
Innovation Solution
A data output device comprising a converter circuit, a boosting circuit, and an output circuit that generates a conversion signal, a boosting signal, and an output signal based on input and feedback signals, respectively, to amplify and process signals effectively, particularly using a photodiode and converter to generate and amplify voltage signals from light intensity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amplification circuits are used to amplify weak signals from sensing elements, then the circuit complexity increases and more transistors are required, but the signal amplification remains insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the output signal is fed back to the input through a feedback circuit. This feedback loop enables the circuit to automatically adjust and amplify weak signals without requiring complex external control circuits. The feedback signal is combined with the input signal to produce the output signal, creating a self-regulating amplification system that improves signal detection capability while maintaining circuit simplicity.
2Power
If more transistors are added to increase gain in conventional amplifiers, then the device area increases and manufacturing complexity increases, but the amplification effect is limited
Solution Approach 1:
The patent merges the amplification function with the existing sensor structure by integrating the amplification circuit directly with the sensing element. This integration allows the circuit to achieve high signal gain without requiring additional discrete transistors or increased device area. The merged structure enables efficient signal processing within the same physical footprint as the original sensor.
3Measurement precision
If conventional amplification methods are used for small signal changes, then the output signal quality remains poor and data output is ineffective, but increasing amplification strength increases noise and distortion
Solution Approach 1:
The patent introduces a feedback circuit as an intermediary element that processes the output signal and feeds it back to the input. This intermediary feedback mechanism allows for controlled signal amplification while filtering out noise and distortion. The feedback circuit acts as a mediator that separates the useful signal from harmful noise, enabling high-quality output without the adverse effects of excessive amplification.
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
Enhances signal amplification, reducing the number of transistors required while maintaining effective gain, enabling efficient data output even with small signal changes, thus improving the performance of event-based vision sensors.
Implementation Method 1
a photodiode configured to generate a current signal corresponding to a change in an intensity of incident light
Data Source
AI summary
A data output device is provided. The data output device includes a converter circuit configured to generate a conversion signal based on an output signal; a boosting circuit configured to generate a boosting signal based on the output signal; and an output circuit configured to generate the output signal based on an input signal and a feedback signal, the feedback signal being based on the conversion signal and the boosting signal.