Anti-fuse Circuit Voltage Clamp Stability
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Solution Overview
Problem
Conventional anti-fuse circuits in semiconductor memory apparatuses are sensitive to external voltage fluctuations, leading to false fuse signals and malfunctions when external voltage levels unexpectedly rise, causing unintended breakdown of the anti-fuse even if a program operation was not performed.
Innovation Solution
Incorporating a voltage clamp unit that generates a constant clamp voltage proportional to the external voltage level when it exceeds a predetermined threshold, and a fuse signal generation unit that resets the transmission node to this clamp voltage at the initial stage of the program mode, thereby minimizing external effects on the anti-fuse and preventing false fuse signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional anti-fuse circuit is used, then the circuit can perform fuse operations, but the anti-fuse sensitively reacts to external voltage levels and may break down unintentionally when voltage rises, generating false fuse signals
Solution Approach 1:
The patent introduces a clamp voltage generation unit as an intermediary component between the power supply and the anti-fuse circuit. This unit generates a clamp voltage that is clamped to a reference voltage level, acting as a buffer to isolate the anti-fuse circuit from external voltage fluctuations. The clamp voltage serves as a mediator that protects the anti-fuse from direct exposure to harmful voltage spikes, thereby resolving the contradiction between maintaining operational reliability and reducing voltage sensitivity.
Solution Approach 2:
The patent implements beforehand cushioning by pre-generating the clamp voltage through the clamp voltage generation unit before any potential voltage spikes occur. This clamp voltage is prepared in advance to cushion or absorb the impact of external voltage fluctuations. By having this protective voltage level ready beforehand, the anti-fuse circuit is shielded from unintended breakdown caused by voltage rises, thus improving reliability while mitigating external voltage sensitivity.
2Adaptability or versatility
If the external voltage level rises unexpectedly, then the anti-fuse may break down and generate a false fuse signal, but this causes malfunction of the entire semiconductor apparatus
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage level parameter through the clamp voltage generation unit. Instead of allowing the anti-fuse circuit to directly experience varying external voltage levels, the system changes the voltage parameter to a clamped reference level. This parameter transformation allows the circuit to adapt to external voltage fluctuations while maintaining stable and accurate fuse signal generation, thereby resolving the contradiction between voltage adaptability and signal accuracy.
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 stabilizes the voltage level at the transmission node, preventing abnormal breakdown of unselected anti-fuse units and ensuring the semiconductor apparatus functions correctly even under external voltage noise, thereby maintaining the integrity of the semiconductor memory apparatus.
Implementation Method 1
a voltage clamp unit configured to generate a clamp voltage proportional to an external voltage level to generate the clamp voltage having a constant voltage level when the external voltage level rises to a predetermined level or more
Implementation Method 2
The anti-fuse is electrically open in a normal state. However, when a high voltage is applied to break down the dielectric between the conductors, the anti-fuse is shorted
Data Source
AI summary
An anti-fuse circuit includes: a rupture unit including an anti-fuse programmed in response to an input rupture signal during a program mode, and configured to generate an output rupture signal corresponding to a state of the anti-fuse to output the generated output rupture signal to a transmission node, a voltage clamp unit configured to generate a clamp voltage proportional to an external voltage level to generate the clamp voltage having a constant voltage level when the external voltage level rises to a predetermined level or more, and a fuse signal generation unit configured to reset the transmission node to the clamp voltage at the initial stage of the program mode to generate a fuse signal in response to the voltage level of the transmission node during an output mode.