Laser Detector Using Delay-Chain Transient Voltage Detection
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Solution Overview
Problem
Traditional laser detectors require a large layout area due to numerous detection components, leading to high hardware complexity and lower detection accuracy, and they fail to effectively protect security or authentication systems from laser signal attacks that can cause data leakage.
Innovation Solution
A laser detector utilizing a delay chain circuit and a warning circuit, coupled with substrate bias voltages and a closed-loop latch circuit, to generate a warning signal based on transient voltage fluctuations, enhancing detection accuracy and reducing hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional latch circuit with numerous detection components is used, then detection probability is improved, but layout area and hardware complexity increase significantly
Solution Approach 1:
The detection function is segmented into two parts: the delay chain circuit segments the laser signal detection into multiple stages through cascaded inverters, while the warning circuit segments the response function to detect transient voltage fluctuations. This segmentation allows detection with fewer components than traditional latch circuits.
Solution Approach 2:
The invention changes the detection parameter from monitoring multiple component states to monitoring transient voltage fluctuation at a single node. By detecting voltage changes over time in the delay chain output, the system achieves high detection probability with simplified hardware architecture.
2Reliability
If traditional latch circuit with numerous detection components is used, then detection probability is improved, but layout area increases
Solution Approach 1:
The delay chain circuit and warning circuit are merged into a compact integrated structure where the warning circuit directly monitors the delay chain output. This merging eliminates the need for separate detection components and reduces overall layout area while maintaining detection effectiveness.
3Reliability
If security systems are protected from laser attacks, then data leakage risk is reduced, but detection accuracy must be improved
Solution Approach 1:
The warning circuit provides feedback by continuously monitoring the delay chain output for transient voltage fluctuations. This feedback mechanism enables real-time detection of laser signal interference, improving both security protection and detection accuracy simultaneously.
Solution Approach 2:
The delay chain circuit performs preliminary action by propagating the input signal through multiple inverter stages before detection. This preliminary signal processing amplifies transient voltage fluctuations caused by laser interference, making them easier to detect with high accuracy using the warning circuit.
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
The laser detector provides high detection accuracy with reduced hardware complexity by using a delay chain circuit and closed-loop latch circuit, effectively identifying laser signal interference and preventing data breaches.
Implementation Method 1
when an inverter including metal-oxide-semiconductor field-effect transistors is attacked by the laser signal, a transient photoelectric current is generated at its P-N junction
Data Source
AI summary
A laser detector includes a delay chain circuit and a warning circuit. The warning circuit is coupled to the delay chain circuit for generating a warning signal. The delay chain circuit includes N inverters coupled in series, an input terminal configured to receive an input voltage to the N inverters, and an output terminal configured to output an output voltage generated by the N inverters. N is a positive integer.