Semiconductor Fuse Peripheral Circuit Prevents Signal Feedback
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Solution Overview
Problem
In semiconductor memory devices, the signal stored in the latch circuit can flow back to the fuse during disconnection judgment, causing negative feedback and misjudgment of whether the fuse has been blown or not.
Innovation Solution
A semiconductor device is designed with a transmission prevention circuit, including a logic gate and a transfer gate, which prevents the signal from the memory circuit from being sent back to the fuse during judgment, reducing the risk of misjudgment by converting the potential signal into a high or low output signal and using a NAND circuit for accurate disconnection determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the latch circuit is directly connected to the fuse for disconnection judgment, then the judgment process is simple, but the signal from the memory circuit flows back to the fuse causing negative feedback and misjudgment
Solution Approach 1:
A transmission prevention circuit is introduced as an intermediary component between the latch circuit and the fuse. This circuit includes a transfer gate that selectively blocks the signal path from the memory circuit to the fuse during judgment operations, preventing negative feedback while allowing normal operation signal transmission.
Solution Approach 2:
The transfer gate dynamically changes its conduction state based on the operational phase. During fuse judgment, the transfer gate is turned off to block signal transmission and prevent negative feedback. During normal operation, the transfer gate is turned on to allow signal transmission, thus adapting the circuit behavior to different operational requirements.
2Speed
If the signal is transmitted directly from the memory circuit to the fuse, then the judgment speed is fast, but negative feedback occurs causing misjudgment
Solution Approach 1:
The transmission prevention circuit acts as a mediator that controls signal flow timing. It allows rapid signal transmission during normal operation while blocking the signal path during judgment to eliminate negative feedback, thus maintaining both speed and accuracy.
Solution Approach 2:
The transfer gate operates periodically, switching between conduction and blocking states based on the operational phase. During judgment phases, it blocks signals to prevent feedback; during normal operation, it conducts signals, creating a periodic control pattern that ensures accurate judgment while maintaining operational speed.
Data Source
AI summary
A fuse peripheral circuit includes a fuse, a potential difference imparting circuit, a potential difference reducing circuit, a terminal, a memory circuit, a transfer gate, and a logic gate. The logic gate is connected to the input end of the transfer gate. The logic gate serves as a transmission prevention circuit preventing a signal stored in the memory circuit from being transmitted to the fuse, when the disconnection judgment takes place.