ESD Protection Circuit Preventing Lock-On Failure
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Solution Overview
Problem
Integrated circuits face challenges in withstanding electrostatic discharge (ESD) stress due to scaled-down devices and thinner gate oxides, which can lead to lock-on failure in ESD protection circuits, compromising their reliability and commercial viability.
Innovation Solution
An ESD protection circuit comprising a discharge device and dual detection circuits that activate and deactivate the discharge path based on the presence of an ESD event, utilizing transistors and inverter units to manage the discharge path effectively and prevent lock-on failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge device remains activated continuously to ensure ESD protection, then protection is always available, but normal circuit operation is disrupted due to lock-on failure
Solution Approach 1:
The patent employs dynamic control of the discharge device activation state based on real-time ESD event detection. The discharge device transitions between activated and deactivated states according to the presence or absence of ESD events, as determined by the detection circuit. This dynamic approach ensures protection availability when needed while enabling normal circuit operation when ESD threats are absent, preventing lock-on failure.
2Ease of operation
If the discharge device is deactivated to enable normal operation, then circuit functionality is restored, but ESD protection capability is lost
Solution Approach 1:
The patent implements preliminary detection of ESD events through the detection circuit before the discharge device is activated. The detection circuit monitors the power rail continuously and is prepared to activate the discharge device immediately upon detecting an ESD event. This preliminary action ensures that protection capability is maintained ready-state without being continuously activated, allowing normal circuit operation while preserving ESD protection readiness.
Data Source
AI summary
An ESD protection circuit including a discharge device, a first detection circuit, and a second detection circuit. The discharge device provides a discharge path between a first power rail and a second power rail when the discharge device is activated. The discharge device stops providing the discharge path when the discharge device is de-activated. The first detection circuit is coupled between the first and the second power rails. The first detection circuit activates the discharge device when an ESD event occurs in the first power rail. The second detection circuit de-activates the discharge device when the ESD event does not occur in the first power rail.