Fuse Circuit with Comparison Unit for Accurate State Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor redundancy circuits face reliability issues due to inaccurate resistance states of fuses, leading to incorrect activation times and malfunctioning repair operations, especially when the threshold voltage of inverters varies with environmental conditions.
Innovation Solution
A fuse circuit with a comparison unit, such as a latched differential sense amplifier, is used to compare the voltage level of an output terminal driven by a fuse with a predetermined reference voltage, generating a fuse state signal to accurately detect whether the fuse is cut or not, and an auxiliary level maintaining unit ensures the output terminal is maintained at a predetermined level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional redundancy circuit with simple fuse activation is used, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates due to inaccurate resistance states of fuses leading to incorrect activation times
Solution Approach 1:
A comparison unit is introduced as an intermediary component between the fuse activation circuit and the output stage. This comparison unit measures the resistance state of the fuse and compares it with a reference value, generating a corrected activation signal only when the fuse state matches the expected state. This intermediary mechanism ensures accurate fuse state detection without requiring fundamental changes to the overall circuit architecture.
Solution Approach 2:
The patent replaces simple voltage threshold detection with a more sophisticated resistance measurement and comparison system. Instead of relying on direct voltage level detection that is sensitive to environmental variations, the system uses a comparison unit that actively measures resistance and compares it with a reference, substituting passive threshold detection with active measurement and comparison logic.
2Measurement precision
If the threshold voltage of inverters is used for fuse detection, then the device complexity is minimized, but the measurement precision deteriorates due to threshold voltage variation with environmental conditions
Solution Approach 1:
The comparison unit implements a feedback mechanism that continuously monitors the fuse resistance state and compares it with a reference value. The output of the comparison unit feeds back to control the activation signal, ensuring that the system responds only when the fuse state truly changes. This feedback loop compensates for environmental variations and ensures precise measurement regardless of temperature or voltage fluctuations.
Solution Approach 2:
The patent changes the detection parameter from voltage threshold to resistance measurement. By measuring the resistance state of the fuse directly and comparing it with a reference resistance value, the system achieves more precise detection that is less sensitive to environmental conditions. The comparison unit adjusts its operation based on the measured resistance parameter rather than relying on fixed voltage thresholds.
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
This solution ensures accurate detection of fuse states, improving the reliability of semiconductor devices by providing correct output results and enabling fast circuit analysis through precise resistance value measurement.
Implementation Method 1
measuring a resistance value of a fuse... comparing a voltage level of an output terminal driven through a current path including a fuse with a predetermined reference voltage
Data Source
AI summary
A fuse circuit includes a fuse unit configured to drive an output terminal via a current path including a fuse in response to a fuse enable signal; and a comparison unit configured to be activated in response to an activation signal for comparing a reference voltage having a predetermined level with a voltage level of the output terminal to generate a fuse state signal.