Integrated Circuit Copy Prevention via Photoelectric Self-Destruct
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Solution Overview
Problem
The increasing cost and vulnerability of semiconductor integrated circuits to reverse engineering and copying, as competitors remove light-blocking covers to inspect and de-process the circuits, necessitate a means to protect design and structure information.
Innovation Solution
Incorporating a photoelectric cell that powers the integrated circuit when exposed to light, enabling the circuit to disable itself by setting outputs permanently, blowing fuses, damaging the silicon, and erasing or reprogramming memory to prevent copying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the integrated circuit is left accessible for inspection and reverse engineering, then design and structure information can be obtained for copying, but security and protection of intellectual property deteriorates
Solution Approach 1:
The circuit performs a preliminary self-destruct action upon detecting unauthorized inspection conditions. Before the actual copying or reverse engineering can occur, the circuit has already been configured to automatically disable itself when specific conditions are met, preventing the loss of design information
Solution Approach 2:
The patent converts the harmful effect of light exposure (which enables inspection) into a beneficial trigger mechanism. The same light that would allow reverse engineering now activates the photoelectric cell to power the self-destruct sequence, turning the inspection attempt against the copier
2Reliability
If a protection mechanism is added to prevent reverse engineering, then security improves, but device complexity increases
Solution Approach 1:
The integrated circuit protects itself through self-service mechanisms. The photoelectric cell, fuse array, and self-destruct logic are all integrated within the circuit itself, eliminating the need for external protection devices or complex monitoring systems. The circuit monitors its own conditions and executes protection autonomously
Solution Approach 2:
The protection mechanism merges multiple functions into a single integrated structure. The photoelectric cell, power management, fuse array, and self-destruct logic are combined within the same circuit package, reducing overall device complexity while maintaining high reliability
3Loss of information
If the circuit disables itself upon light exposure, then copying prevention is effective, but legitimate testing and authorized access may be blocked
Solution Approach 1:
The circuit employs dynamic behavior where the response to light exposure changes based on the state of the fuse array. Initially, the circuit operates normally and can be tested. Once the fuse is blown (indicating unauthorized access attempt), the circuit dynamically switches to a disabled state, providing both flexibility for legitimate use and protection against copying
Solution Approach 2:
The circuit uses feedback from the fuse array state to control its operation. The photoelectric cell detects light and triggers the self-destruct sequence, which then provides feedback by changing the circuit state to disabled. This feedback mechanism ensures that once protection is activated, it remains effective while allowing normal operation during authorized testing phases
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
Effectively prevents unauthorized copying by ensuring the integrated circuit is rendered inoperable when power is applied, maintaining design and structure security while allowing authorized access.
Implementation Method 1
a photoelectric cell disposed on the substrate and coupled to the first circuit, the photoelectric cell to provide power to the first circuit when the photoelectric cell is exposed to light
Data Source
AI summary
An integrated circuit includes a substrate, a first circuit disposed on the substrate, a photoelectric cell disposed on the substrate and coupled to the first circuit, the photoelectric cell to provide power to the first circuit when the photoelectric cell is exposed to light, and the first circuit to allow disabling at least a portion of the integrated circuit when powered by the photoelectric cell.