Semiconductor ESD Protection Structure With Nested Doping Regions
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Solution Overview
Problem
Integrated circuits are vulnerable to damage from electrostatic discharge (ESD) caused by human body, metal objects, and charged devices, necessitating effective ESD protection devices.
Innovation Solution
A semiconductor device with a transistor structure comprising specific doping regions and wells of varying conductive types, forming a BJT to expel ESD current to ground, thereby protecting internal circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor structure with multiple doping regions and wells is used to protect internal circuits from ESD, then electrostatic protection capability is improved, but device structure complexity increases
Solution Approach 1:
The patent implements nested doping regions where a first doping region is formed within a second doping region, which is itself formed within a third doping region. This nested structure creates multiple protective layers against ESD while maintaining a compact footprint, allowing the device to protect internal circuits without proportionally increasing overall device area or structural complexity.
Solution Approach 2:
The patent extends the protection mechanism into the vertical dimension by forming doping regions at different depths within the semiconductor substrate. The first, second, and third doping regions are positioned at different vertical levels, creating a three-dimensional protective architecture that enhances ESD protection capability while utilizing the substrate depth rather than increasing lateral footprint.
2Reliability
If multiple doping regions with different conductive types are formed to redirect ESD current, then current redirection efficiency is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies local quality by creating doping regions with different conductive types (first conductive type and second conductive type) at specific locations within the transistor structure. The first doping region has a first conductive type, the second doping region has a second conductive type, and the third doping region has the first conductive type. This localized differentiation of conductive properties enables efficient ESD current redirection paths while confining the complexity to specific regions rather than the entire device.
Solution Approach 2:
The patent utilizes parameter changes by varying the conductive type parameter across different doping regions. The alternating pattern of first and second conductive types in the nested doping regions creates favorable conditions for ESD current flow, changing the electrical parameters locally to optimize protection while maintaining overall manufacturing feasibility through systematic parameter variation.
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 proposed structure effectively redirects ESD current away from internal circuits, enhancing electrostatic tolerance without increasing circuit area or manufacturing complexity.
Implementation Method 1
Semiconductor device and semiconductor structure for electrostatic protection... Integrated circuits can be seriously damaged by any kind of electrostatic discharge... an effective ESD protection device is required to prevent the integrated circuit from experiencing damage caused by ESD
Data Source
AI summary
A semiconductor device for protecting an internal circuit includes a transistor, a first doping region, and a second doping region. The transistor includes a gate terminal, a source terminal, and a drain terminal. The gate terminal is coupled to a ground. The source terminal is coupled to the internal circuit. The drain terminal is coupled to an input/output pad. The first doping region has a first conductive type. The second doping region has a second conductive type and is adjacent to the first doping region. The first doping region and the second doping region form the gate terminal. The first conductive type is different from the second conductive type.