ESD Protection Structure With Guard Ring for Deep Sub-Micron ICs
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Solution Overview
Problem
As semiconductor manufacturing advances into the deep sub-micron stage, integrated circuits (IC) become more vulnerable to electrostatic discharge (ESD) stress due to scaled-down devices and thinner gate oxides, requiring effective ESD protection mechanisms.
Innovation Solution
The proposed ESD protection structure includes a P-type substrate, a P-type structure, an N-type buried layer, an element active region, a P-type guard ring, and an N-type structure, where the P-type guard ring surrounds the element active region to enhance ESD protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor devices are scaled down to deep sub-micron stage, then device integration and manufacturing capability are improved, but vulnerability to ESD stress increases
Solution Approach 1:
The patent introduces a P-type guard ring as an intermediary protective structure between the ESD stress source and the sensitive deep sub-micron devices. The guard ring acts as a mediator that intercepts and dissipates ESD currents before they can reach the scaled-down devices, thereby protecting the high-density integrated circuit while maintaining the benefits of device scaling.
Solution Approach 2:
The P-type guard ring is positioned strategically around sensitive device regions to provide beforehand protection against ESD stress. By placing this protective structure in advance around vulnerable areas, the patent creates a cushioning effect that prevents ESD damage before it can occur to the scaled-down devices, enabling safe operation at deep sub-micron dimensions.
2Productivity
If thinner gate oxides are used in scaled-down devices, then device density and performance are improved, but susceptibility to ESD damage increases
Solution Approach 1:
The P-type guard ring serves as a protective intermediary that intercepts ESD currents before they can reach the thinner gate oxides. By positioning the guard ring around regions with thin gate oxides, the patent creates a protective barrier that mediates between external ESD stress and the vulnerable oxide layers, enabling the use of thinner oxides for higher device density without proportionally increasing ESD susceptibility.
3Reliability
If ESD protection devices are added to input/output pads, then ESD protection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the ESD protection function with the existing substrate structure by forming the P-type guard ring as an integrated part of the semiconductor device architecture. Rather than adding separate, discrete protection devices that would increase complexity, the guard ring is combined with the substrate and device layout, providing ESD protection capability while maintaining relatively simple device structure.
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 ESD protection structure effectively increases the endurance against ESD events by utilizing the P-type guard ring to discharge ESD currents, thereby protecting the IC from damage.
Implementation Method 1
electrostatic discharge (ESD) protection structure... P-type guard ring... discharge ESD currents
Data Source
AI summary
An electrostatic discharge (ESD) protection structure including a P-type substrate, a P-type structure, an N-type buried layer, an element active region, a P-type guard ring, and an N-type structure is provided. The P-type structure is formed in the P-type substrate and serves as an electrical contact of the P-type substrate. The N-type buried layer is formed in the P-type substrate. The element active region is formed on the N-type buried layer. The P-type guard ring is formed on the N-type buried layer and surrounds the element active region. The N-type structure is formed on the N-type buried layer and disposed between the P-type guard ring and the P-type structure.