Voltage Threshold Detector Using Diode Bias for Fast IC Protection
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Solution Overview
Problem
Integrated circuits are vulnerable to voltage attacks that can compromise security and cause damage, with existing voltage detectors being slow, requiring analog references, or expensive clock references, and lacking flexibility.
Innovation Solution
A voltage variation detector using a transistor diode and inverter to detect voltage thresholds, providing a self-generated reference and fast response without needing analog or clock references, capable of detecting both overvoltage and undervoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing voltage detectors are used, then voltage threshold detection is achieved, but detection speed is slow and analog/clock references are required
Solution Approach 1:
The patent implements self-generated voltage references using transistor diodes that automatically establish reference voltages based on their forward voltage characteristics. The detector circuit uses the inherent properties of transistor diodes to generate its own reference levels without external analog or clock references, enabling fast detection while eliminating complex reference circuitry
Solution Approach 2:
The patent replaces traditional analog reference systems with a digital logic-based detection mechanism. By using transistor diodes in a logic circuit configuration with inverters, the system substitutes complex analog reference generation with simpler digital logic operations that inherently provide fast response times
2Reliability
If comprehensive voltage monitoring is implemented, then security protection is improved, but silicon footprint and cost increase
Solution Approach 1:
The patent combines multiple detection functions into a single integrated circuit block that simultaneously monitors for both overvoltage and undervoltage conditions. The transistor diode-based detector integrates the reference generation, comparison, and detection logic into one compact unit, providing comprehensive security protection while minimizing silicon footprint through functional consolidation
Solution Approach 2:
The detector circuit is designed to universally detect various voltage anomaly types (overvoltage, undervoltage, voltage spikes) using the same hardware structure. The transistor diode-based reference system provides multi-functional capability, eliminating the need for separate detection circuits for different voltage conditions and thereby reducing overall chip area
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 solution offers rapid detection of voltage variations, protecting integrated circuits from security threats and component damage with a smaller silicon footprint and reduced costs.
Implementation Method 1
an inverter connected to the transistor diode and configured to detect when the voltage crosses a voltage threshold based on the transistor diode being reversed biased
Data Source
AI summary
The disclosure provides a voltage detecting circuit that detects voltage increases and voltage decreases using a diode drop and voltage thresholds. The voltage detecting circuit, referred to as a voltage variation detector, uses the diode to maintain a differential between the voltage being monitored and a voltage threshold. When the diode is reversed bias, the voltage variation detector generates a detecting signal indicating the monitored voltage crossed the voltage threshold. In one example, the method includes: (1) detecting at least one transition of a voltage across a voltage threshold, wherein the detecting is based on a transistor diode being reversed biased, (2) generating a detection signal when the voltage crosses the voltage threshold, and (3) performing one or more actions in response to the detection signal.