Semiconductor Gate-Off Circuit for Signal-Pad ESD Protection
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Solution Overview
Problem
Semiconductor elements can be damaged by currents introduced from sources other than electrostatic discharge (ESD), despite the presence of ESD protection circuits.
Innovation Solution
Incorporation of a gate-off circuit that connects the gate and source of semiconductor elements during ESD events to divert currents away from the elements, using switch circuits and transistors to control current flow through clamping circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate-off circuit is added to divert currents, then protection against all current sources is improved, but device complexity increases
Solution Approach 1:
The gate-off circuit is designed with multi-functionality to protect against multiple types of harmful currents (ESD, latch-up, EOI, EOP) using a single unified structure. The circuit monitors current conditions and responds appropriately regardless of the current source, eliminating the need for separate protection circuits for each threat type and thereby reducing overall device complexity.
Solution Approach 2:
The gate-off circuit combines multiple protection functions into a single integrated circuit block. By merging ESD protection, latch-up prevention, and other overcurrent protection mechanisms into one unified gate control structure, the design achieves comprehensive protection while minimizing the increase in device complexity compared to having separate protection circuits for each function.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes: a first power pad; a second power pad; a signal pad; a clamping circuit connected between the first power pad and the second power pad; a driving circuit connected to the signal pad and including a pull-up circuit and a pull-down circuit; and a first gate-off circuit connected to the pull-down circuit. The first gate-off circuit is configured to connect a gate of the pull-down circuit and a source of the pull-down circuit to each other during an electrostatic discharge (ESD) event in which a high voltage is applied to the signal pad, and control a current generated by the high voltage to flow to the clamping circuit.