Integrated ESD Protection Layout for Lower Triggering Voltage
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Solution Overview
Problem
Conventional ESD protection devices in semiconductor chips face challenges in integrating ESD protection circuits effectively due to the area occupied by external capacitors, which decreases the degree of integration and increases the triggering voltage, leading to inefficient power management during electrostatic discharge events.
Innovation Solution
An ESD protection device and circuit design that includes a capacitor electrode connected to a metal interconnect, spaced apart from and overlapping the gate electrode, increasing gate-drain capacitance without the need for an external capacitor, thereby reducing the overall area and lowering the triggering voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external capacitor is connected between the gate electrode and drain region to lower the triggering voltage, then the triggering voltage is reduced and ESD characteristics are improved, but the device area increases and degree of integration decreases
Solution Approach 1:
The patent merges the capacitor function with the gate electrode structure by forming the gate electrode to extend over the drain region, creating an integrated gate-drain capacitor. This eliminates the need for a separate external capacitor while maintaining the ESD protection function, thereby reducing device area and improving integration density.
Solution Approach 2:
The gate electrode serves dual functions: as the control electrode for the MOS transistor and as one plate of the capacitor. This multi-functionality allows the same structure to provide both transistor operation and ESD protection capacitance, reducing the overall component count and device area.
2Reliability
If an external capacitor is used to increase gate-drain capacitance, then the triggering voltage is lowered, but the device complexity increases
Solution Approach 1:
The patent combines the capacitor plates by using the gate electrode itself as one plate and forming a conductive structure over the drain region as the other plate. This integration eliminates the need for separate capacitor components and external connections, thereby reducing device complexity while maintaining the desired gate-drain capacitance for triggering voltage control.
3Reliability
If the gate electrode and drain region are spaced apart by a preset distance and overlap each other, then the gate-drain capacitance is increased, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes the gate electrode structure to extend over the drain region during the initial formation process, creating the overlapping configuration and preset spacing relationship between gate and drain. This preliminary structuring ensures consistent capacitance values without requiring high-precision alignment operations during subsequent manufacturing steps.
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 design enhances the degree of integration by reducing the device area and lowers the triggering voltage, enabling more efficient power management during ESD events by increasing the gate-drain capacitance without increasing the device area, and prevents an increase in drain operating voltage.
Implementation Method 1
increasing a capacitance Cgd between the gate electrode and the drain region
Implementation Method 2
a capacitor electrode electrically connected to a drain region, spaced apart from and overlapping the gate electrode
Data Source
AI summary
An ESD protection device (100) is disclosed. More particularly, the ESD protection device is configured so that a gate electrode (140) and a capacitor electrode (170) electrically connected to a drain region (162) are spaced apart from each other by a preset distance, and partially or entirely overlap each other, thereby increasing a capacitance (Cgd) between the gate electrode and the drain region.