Fuse Protection Circuit for Accidental Programming Isolation
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Solution Overview
Problem
Integrated circuits face issues with accidental fuse programming due to power supply transients and electrical overstressing, leading to undesired fuse activation and reduced chip yield.
Innovation Solution
A fuse system with multiple switches and protection elements, including a first and second fuse programming switch, a fuse protection capacitor, and a fuse protection diode, is designed to isolate the fuse from undesired voltage spikes and transients, ensuring controlled programming and sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fuse is used to store information in integrated circuits, then manufacturing flexibility and device configuration capability are improved, but the risk of accidental fuse programming due to power supply transients and electrical overstressing increases
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the fuse and the external environment. This circuit includes control elements that mediate the programming process, ensuring that only authorized programming operations can activate the fuse while blocking accidental activation from voltage spikes or transients.
Solution Approach 2:
The protection circuit applies preliminary anti-action by pre-configuring control mechanisms that prevent accidental fuse programming before it can occur. The circuit monitors and controls the conditions under which the fuse can be programmed, actively counteracting potential harmful voltage transients before they can cause unintended fuse activation.
2Reliability
If protection circuits are added to prevent accidental fuse programming, then fuse programming stability is improved, but device complexity increases
Solution Approach 1:
The protection circuit is segmented into distinct functional modules, each performing a specific protective function. This segmentation allows the complex protection mechanism to be broken down into manageable components that can be independently designed, tested, and optimized, reducing the overall complexity burden on the integrated circuit.
Solution Approach 2:
The protection circuit is designed with multi-functionality to handle various types of threats (voltage spikes, transients, unauthorized programming attempts) using a unified control mechanism. This universal approach reduces complexity compared to having separate protection circuits for each type of threat.
Data Source
AI summary
This disclosure relates to circuits, methods, and devices designed to mitigate accidental activation of fuses. Accidental fuse activation can occur due to power supply transients, electrical overstressing, etc. A fuse system described herein can include a first fuse programming switch connected between a shared power supply and programming pad and a fuse, and a second fuse programming switch connected between the fuse and a ground or other voltage potential pad. The system can utilize these switches to selectively enable or isolate the fuse during programming or regular operation, thereby protecting the fuse from unintended voltage spikes or transients.