Monostable PUF Circuit Self-Filtering via Schmitt Trigger Hysteresis
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Solution Overview
Problem
Conventional monostable PUF circuits suffer from stability issues due to fluctuating output voltages caused by temperature and voltage variations, leading to unreliable PUF responses.
Innovation Solution
A self-filtering monostable PUF circuit utilizing a Schmitt trigger's hysteresis effect to filter out unstable PUF units, ensuring only stable outputs are retained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional monostable PUF circuits use amplifiers in series to extract entropy sources, then PUF responses can be generated, but the output voltage shifts with voltage and temperature fluctuations causing stability problems
Solution Approach 1:
The patent introduces a Schmitt trigger as an intermediary component between the PUF units and the output. The Schmitt trigger's hysteresis effect creates a threshold mechanism that filters out small voltage variations caused by temperature and voltage fluctuations, allowing only significant changes to pass through. This mediator protects the PUF response stability from environmental disturbances while maintaining the core functionality of the PUF circuit.
Solution Approach 2:
The patent utilizes the hysteresis parameter of the Schmitt trigger to change the sensitivity threshold of the PUF circuit. By adjusting the hysteresis voltage levels, the circuit can distinguish between normal environmental fluctuations and actual PUF response changes. This parameter change allows the system to maintain stability across varying temperature and voltage conditions while preserving the unique PUF characteristics.
2Loss of information
If PUF units generate entropy sources near amplifier switching voltage, then high entropy is achieved, but output voltage shifts lead to unstable PUF responses
Solution Approach 1:
The Schmitt trigger acts as a buffer intermediary that decouples the high-entropy generation process from the output stage. It allows the PUF units to operate at optimal entropy-generating voltage levels without directly exposing these sensitive operations to environmental variations. The hysteresis mechanism in the Schmitt trigger absorbs voltage shifts while maintaining stable output levels.
Solution Approach 2:
The Schmitt trigger provides beforehand cushioning by pre-establishing hysteresis thresholds that protect against voltage and temperature fluctuations before they can affect the PUF response stability. The hysteresis effect creates a buffer zone that absorbs environmental variations, cushioning the PUF output from instability caused by voltage and temperature changes.
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 circuit significantly improves stability by reducing the bit error rate by over 91.89% under extreme conditions, maintaining high reliability and randomness of PUF responses.
Implementation Method 1
By adding a filter unit based on a Schmitt trigger, the self-filtering monostable PUF circuit utilizes the hysteresis effect of the Schmitt trigger to efficiently self-filter the PUF units with unstable outputs
Data Source
AI summary
A self-filtering monostable PUF circuit based on hysteresis effect is provided. The self-filtering monostable PUF circuit includes a PUF unit array formed by n×m PUF units distributed in n rows and m columns, wherein n and m are integers greater than or equal to 1. By adding a filter unit based on a Schmitt trigger, the self-filtering monostable PUF circuit utilizes the hysteresis effect of the Schmitt trigger to efficiently self-filter the PUF units with unstable outputs to improve the overall stability of the PUF circuit. The advantage of high stability is achieved.