Semiconductor Fake Device IP Protection via LDD Threshold Shift
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Solution Overview
Problem
The semiconductor industry faces challenges in protecting intellectual property from reverse engineering, as unscrupulous manufacturers can clone semiconductor devices through reverse engineering, which bypasses the typical development cycles and expenses involved in producing these devices.
Innovation Solution
A semiconductor apparatus with fake functionality is designed, featuring a logic device and at least one fake device formed on a substrate, where the fake device cannot be turned on by the same bias voltage applied to the logic device, making it difficult to distinguish from a normal device through reverse engineering. This is achieved by modifying the lightly doped drains (LDDs) and using different conductive types for the LDDs, creating a threshold voltage difference that prevents the fake device from being activated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fake devices are added to prevent reverse engineering, then intellectual property protection is improved, but device complexity increases
Solution Approach 1:
The patent creates fake devices that are visual copies of legitimate logic devices, making them indistinguishable through standard reverse engineering techniques. The fake devices replicate the physical structure, dimensions, and appearance of real devices, but contain internal modifications (different conductive types in LDD regions) that prevent functional activation, thereby protecting intellectual property without significantly increasing overall device complexity
Solution Approach 2:
The patent applies local quality by modifying specific regions (lightly doped drain regions) of the fake devices with different conductive types compared to the legitimate devices. This localized modification ensures that only specific parts of the device structure differ, making the fake devices visually identical to real devices while preventing their activation through standard bias voltages
2Measurement precision
If fake devices with different conductive types are used, then distinguishability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the electrical parameter (conductive type) of the lightly doped drain regions in fake devices while maintaining all physical dimensions, shapes, and visual characteristics identical to legitimate devices. This parameter change at the electrical level provides distinguishability through functional testing without requiring changes to manufacturing precision for physical structure creation
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 effectively prevents reverse engineering by ensuring the fake devices are indistinguishable from normal logic devices, thereby protecting intellectual property and making it impractical for unauthorized duplication, while maintaining manufacturing efficiency and cost-effectiveness.
Implementation Method 1
modifying the lightly doped drains (LDDs) and using different conductive types for the LDDs, creating a threshold voltage difference that prevents the fake device from being activated
Data Source
AI summary
A semiconductor apparatus with fake functionality includes a logic device and at least one fake device. The logic device is formed on a substrate and turned on by a bias voltage. The fake device is also formed on the substrate. The fake device cannot be turned on by the same bias voltage applied on the logic device.