Power Clamping Circuit With Voltage-Triggered EOS Discharge Path
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Solution Overview
Problem
Existing integrated circuits struggle to form an effective discharge path for electrical overstress (EOS) events, which can lead to EOS surge currents flowing into internal circuits and causing damage, as they typically last for microseconds, whereas existing power clamping circuits are inadequate in handling such events.
Innovation Solution
An integrated circuit for power clamping is designed with a switch, resistor, capacitor, inverter, and voltage detection circuit, where the voltage detection circuit connects the first node to the ground line when the power line voltage exceeds a threshold, activating the switch and forming a discharge path through the inverter to prevent EOS surge currents from entering the internal circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power clamping circuits are used, then ESD protection is provided, but EOS events cannot be handled effectively
Solution Approach 1:
The circuit employs dynamic response mechanisms where the voltage detection circuit continuously monitors power line voltage and activates the discharge path only when voltage exceeds the threshold, allowing the circuit to adapt its behavior based on real-time conditions rather than maintaining a fixed state
Solution Approach 2:
The circuit changes its operational parameters based on the detected voltage level. During normal operation, the switch remains off. When voltage exceeds the threshold during an EOS event, the switch turns on to create a low-impedance discharge path, effectively changing the circuit's resistance parameter in response to the stress condition
2Reliability
If existing power clamping circuits are used, then circuit structure is simple, but discharge path cannot be formed for EOS events
Solution Approach 1:
The power clamping circuit is segmented into distinct functional modules: voltage detection circuit, control switch, and discharge path components. This segmentation allows each module to perform its specific function independently while working together to achieve EOS protection
Solution Approach 2:
The voltage detection circuit acts as an intermediary between the power line and the control switch, monitoring voltage conditions and triggering the switch activation only when necessary, thereby mediating between normal operation and protection mode
3Object-affected harmful factors
If existing power clamping circuits are used, then ESD surge current is blocked, but EOS surge current flows into internal circuit
Solution Approach 1:
The circuit prepares for EOS events by continuously monitoring voltage levels and having the discharge path components ready to activate. When voltage exceeds the threshold, the switch rapidly turns on to create the discharge path before the EOS surge current can damage the internal circuit
Solution Approach 2:
The circuit converts the harmful EOS surge current into a beneficial protective mechanism by using the excessive voltage itself as the trigger signal to activate the discharge path, thereby transforming the harmful condition into the activation signal for protection
Data Source
AI summary
An integrated circuit for power clamping is provided. The integrated circuit for power clamping is electrically coupled to an internal circuit of an integrated circuit through a power line and a ground line, and includes a switch, a first resistor, a capacitor, an inverter and a voltage detection circuit. The voltage detection circuit detects a voltage of the power line, and when the voltage of the power line exceeds a threshold value, the voltage detection circuit electrically connects a first node to the ground line, such that a low potential signal from the ground line is input to the input terminal of the inverter, and then the switch is turned on to form a discharge path.