Electric Fuse Sensing Circuit Using Capacitor Discharge Speed
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Solution Overview
Problem
Conventional sensing circuits for electric fuses struggle to accurately determine the state of an electric fuse based on its discharging speed, as existing methods do not effectively utilize the resistance value change during programming.
Innovation Solution
A sensing circuit that includes a capacitor coupled with the electric fuse, a detection circuit controlling the capacitor's discharge according to a pulse width signal and the present resistance value, and an output circuit that outputs the fuse's state based on the detection voltage and a reference voltage, utilizing the discharging speed of the capacitor to sense the fuse's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensing circuits use constant current sources to generate voltages for sensing, then the circuit can determine fuse state based on voltage comparison, but the circuit cannot accurately differentiate between pre- and post-programmed states due to insufficient utilization of resistance value change
Solution Approach 1:
The patent changes the sensing parameter from static voltage comparison to dynamic discharge speed measurement. By controlling the capacitor discharge process and measuring the discharge speed, the circuit can accurately detect resistance value changes of the fuse, enabling precise differentiation between pre- and post-programmed states.
Solution Approach 2:
The patent replaces the conventional voltage comparison method with a capacitor discharge-based sensing mechanism. The discharge speed of the capacitor, which is influenced by the fuse resistance, serves as the key sensing parameter, providing more accurate state differentiation.
2Adaptability or versatility
If the sensing circuit controls capacitor discharge according to pulse width signal, then the detection can be dynamically adjusted, but the circuit complexity increases due to additional control components
Solution Approach 1:
The patent employs periodic pulse width signals to control the capacitor discharge process. The pulse width modulation allows dynamic adjustment of the discharge duration, enabling the circuit to adapt to different fuse states while maintaining a relatively simple control structure.
Solution Approach 2:
The sensing circuit incorporates feedback mechanisms where the discharge speed information is fed back to the output circuit for state determination. This feedback loop enables dynamic control and accurate state detection without requiring complex additional components.
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 allows for precise detection of the electric fuse's state by controlling the capacitor's discharge and using the discharging speed to determine the resistance value change, effectively indicating whether the fuse is programmed.
Implementation Method 1
The detection circuit controls the capacitor to discharge according to a pulse width signal and a present resistance value of the electric fuse, so as to generate a detection voltage
Data Source
AI summary
A sensing circuit for sensing an electric fuse and a sensing method thereof are provided. The sensing circuit includes a capacitor, a detection circuit, and an output circuit. The capacitor is coupled to the electric fuse. The detection circuit is coupled to the capacitor and the electric fuse. The detection circuit controls the capacitor to discharge according to a pulse width and a present resistance value of the electric fuse so as to generate a detection voltage. The output circuit is coupled to the detection circuit. The output circuit outputs a state of the electric fuse according to the detection voltage and a reference voltage.