Doped Well SCR Layout for Compact ESD Protection
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Solution Overview
Problem
Semiconductor chips are vulnerable to electrostatic discharge (ESD) damage due to transient currents, which can cause permanent failure without adequate protection measures, especially as chip sizes shrink and application environments become more complex.
Innovation Solution
A semiconductor device design featuring doped well regions of specific conductive types with strategically placed semiconductor components and doped regions, forming a Silicon Controlled Rectifier (SCR) structure that provides effective ESD protection with a small device area, allowing for low turn-on voltage and high sustain current, thereby enhancing ESD performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection structures are used, then ESD protection capability is achieved, but device area becomes large
Solution Approach 1:
The patent embeds the ESD protection structure within the active device region by integrating doped regions that serve dual purposes: forming the semiconductor component functionality and providing ESD protection pathways. The first and second doped regions are nested within or adjacent to the active device structure, allowing ESD protection without requiring separate dedicated protection area.
Solution Approach 2:
The patent utilizes vertical stacking and three-dimensional doping profiles to provide ESD protection pathways that extend in multiple spatial dimensions. The doped regions are configured to create current diversion paths that operate in the vertical dimension and lateral dimensions simultaneously, increasing protection effectiveness without proportionally increasing planar device area.
2Area of moving object
If device size is reduced, then integration density is improved, but ESD performance deteriorates
Solution Approach 1:
The patent implements localized doping regions with specific conductivity types and concentrations at critical locations within the device structure. The first doped region and second doped region are positioned to create localized current diversion pathways that activate during ESD events, providing enhanced protection in specific areas without requiring uniform scaling of the entire device structure.
Solution Approach 2:
The patent employs controlled variations in dopant concentration, doping depth, and regional conductivity parameters to optimize ESD performance in scaled devices. By adjusting these parameters in the doped regions, the invention maintains effective ESD protection capability while accommodating reduced device dimensions through precise parameter optimization rather than structural scaling.
Data Source
AI summary
A semiconductor device includes: a doped well region of a first conductive type; M semiconductor components, the M semiconductor components being provided in the doped well region of the first conductive type and being arranged in the doped well region of the first conductive type in a first direction, M being a positive integer, each semiconductor component including a first doped region of a second conductive type and a doped region of a first conductive type, and the doped region of the first conductive type surrounding the first doped region of the second conductive type; and second doped regions of a second conductive type, the second doped regions of the second conductive type being provided on at least one side of the M semiconductor components in the first direction.