Semiconductor Inverter Pair for Unclonable Chip Identification
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Solution Overview
Problem
Current methods for generating unique identification keys for semiconductor chips are costly and increase production cycle times, as they rely on hardware or software solutions that are reproducible and not easily scalable.
Innovation Solution
A semiconductor chip design that utilizes process variations to generate a unique and irreproducible digital value or identification key through a feedback structure of paired elements, such as inverters with different logic thresholds, ensuring each chip produces a distinct and unclonable key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware or software methods are used to generate identification keys, then unique identification can be achieved, but development and production costs increase and production cycle time is extended
Solution Approach 1:
The semiconductor chip generates its own unique identification key automatically during the manufacturing process by utilizing inherent process variations in identical circuit elements. The system does not require external hardware security modules or software programming to create unique identifiers - the identification is self-generated through natural manufacturing variations, thereby reducing development complexity and production costs while maintaining reliability
Solution Approach 2:
The invention changes the approach from using external complex systems to exploiting inherent parameter variations (electrical characteristics) that naturally occur during semiconductor manufacturing. By measuring and utilizing these natural parameter differences in identical circuit elements, the system achieves unique identification without adding complex hardware or software layers
2Productivity
If process variation is utilized to generate identification keys, then manufacturing cost is reduced and production cycle is shortened, but the complexity of ensuring unique and irreproducible keys increases
Solution Approach 1:
The invention replaces complex mechanical or software-based key generation systems with an electrical measurement system that exploits natural process variations. Instead of using physical hardware security modules or complex software algorithms, the system uses electrical characteristic measurements of circuit elements, simplifying the overall system while maintaining security and uniqueness
Solution Approach 2:
The invention creates unique identification by measuring and capturing the natural variations that already exist in the manufacturing process. Rather than creating complexity through additional components, it copies and utilizes the inherent electrical characteristic differences that occur naturally, transforming existing process variations into secure unique identifiers
3Manufacturing precision
If identical circuit elements are manufactured through the same process, then manufacturing consistency is improved, but micro electrical characteristics still vary due to process variation
Solution Approach 1:
The invention converts the harmful effect of process variation (which creates unwanted electrical characteristic differences) into a beneficial feature for generating unique identification keys. By measuring and utilizing these natural variations, the system transforms manufacturing imperfections into secure, unique identifiers, thereby converting a problem into a solution
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 approach simplifies the circuit structure, reduces costs, and guarantees high security by producing a unique and permanent identification key for each chip, even when manufactured using the same process, ensuring the key remains constant and unreplicable.
Implementation Method 1
The plurality of identical circuit elements may be provided on the same wafer through the same manufacturing process according to the same design rule. Accordingly, macroscopic electrical characteristics or digital characteristics of circuit elements may be the same, whereas micro electrical characteristics or analog characteristics of circuit elements may not be exactly the same. The above slight differences result from a process variation existing in a semiconductor process.
Data Source
AI summary
Provided is a semiconductor chip to generate an identification key. The semiconductor chip may include a first inverter having a first logic threshold, a second inverter having a second logic threshold, and a first switch. The first switch may include a first terminal and a second terminal, and may short or open a connection between the first terminal and the second terminal according to an first input voltage value. An input terminal of the first inverter, an output terminal, and the first terminal of the first switch may be connected to a first node. An output terminal of the first inverter, an input terminal of the second inverter, and the second terminal of the first switch may be connected to a second node.