ESD Protection Structure With Isolation Layout for Lower Trigger Voltage
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Solution Overview
Problem
Electrostatic discharge (ESD) can cause damage to integrated circuits due to transient power discharge when charged bodies come into contact with chips or wafers, and existing ESD protection structures are inadequate in managing this issue effectively.
Innovation Solution
An ESD protection structure is designed with a semiconductor substrate, including a first n-type well region, a p-type well region, a first p-type doped region, a second p-type doped region, and an isolation structure, where the isolation structure is positioned between the first and second p-type doped regions, and the distance between the first p-type doped region and the edge of the n-type well region is controlled to improve operation characteristics, such as lowering trigger and breakdown voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the isolation structure is placed between the first p-type doped region and the second p-type doped region with controlled distance, then the ESD protection efficiency is improved through punch-through breakdown, but the device complexity increases due to precise positioning requirements
Solution Approach 1:
The isolation structure serves as an intermediary element positioned between the first p-type doped region and the second p-type doped region. This intermediate structure enables controlled punch-through breakdown while providing electrical isolation, thus improving ESD protection efficiency without requiring direct contact between the doped regions.
Solution Approach 2:
The patent controls the distance parameter between the first p-type doped region and the isolation structure edge to optimize punch-through breakdown characteristics. By adjusting this dimensional parameter, the trigger voltage and breakdown voltage are lowered, improving ESD protection while maintaining a relatively simple structure.
2Reliability
If the distance between the first p-type doped region and the edge of the n-type well region is reduced, then the trigger voltage and breakdown voltage are lowered for better ESD protection, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the distance parameter between the first p-type doped region and the n-type well region edge to achieve desired trigger voltage and breakdown voltage characteristics. By carefully controlling this dimensional parameter, the structure enables lower voltages for ESD protection while maintaining manufacturability through standard fabrication processes.
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
The controlled distance and placement of the isolation structure enhance the ESD protection efficiency by facilitating punch-through breakdown, thereby improving the protection of integrated circuits from electrostatic discharge.
Implementation Method 1
The controlled distance and placement of the isolation structure enhance the ESD protection efficiency by facilitating punch-through breakdown
Data Source
AI summary
An electrostatic discharge protection structure includes a semiconductor substrate and a first n-type well region, a p-type well region, a first p-type doped region, a second p-type doped region, and an isolation structure disposed in the semiconductor substrate. The p-type well region is located adjacent to the first n-type well region. The first p-type doped region and the second p-type doped region are located above the first n-type well region and the p-type well region, respectively. A first portion of the isolation structure is located between the first p-type doped region and the second p-type doped region in a horizontal direction. An edge of the first n-type well region is located under the first portion. A distance between the first p-type doped region and the edge of the first n-type well region in the horizontal direction is less than a length of the first portion in the horizontal direction.