Electrostatic Protection Element With Localized Field Plate Width
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Solution Overview
Problem
Existing semiconductor devices face challenges in adjusting electrostatic breakdown resistance efficiently, requiring significant labor and time for design changes, and existing solutions either increase the size of the electrostatic protection element or necessitate extensive redesign.
Innovation Solution
The electrostatic protection element incorporates a bipolar transistor with a base region and emitter region electrically coupled through a resistance region, featuring an exposed portion and a covered portion in the facing portion of the base region, allowing for adjustable electrostatic breakdown resistance with minimal design changes by optimizing the resistance value and leakage current balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the field plate is increased to alleviate the electric field in corner portions, then the electrostatic breakdown resistance is improved, but the device area increases
Solution Approach 1:
The field plate width is varied locally across different regions of the semiconductor chip. Specifically, the field plate extends wider in corner portions where electric field concentration is most severe, while maintaining appropriate width in other areas. This localized adjustment provides electrostatic protection where needed without unnecessarily increasing the overall device area.
2Reliability
If the electrostatic protection element is redesigned to adjust electrostatic breakdown resistance, then the electrostatic breakdown resistance is optimized, but the design time and labor increase significantly
Solution Approach 1:
The electrostatic protection characteristics are adjusted by modifying geometric parameters of existing structures, specifically the width and extension distance of the field plate. These parameter changes allow optimization of electrostatic breakdown resistance without requiring fundamental redesign of the protection element architecture, thereby reducing design time and labor while achieving the desired reliability improvement.
3Device complexity
If a conventional electrostatic protection element is used, then the design is simple, but the electrostatic breakdown resistance cannot be adequately adjusted
Solution Approach 1:
The field plate structure is segmented into different width portions corresponding to different regions of the semiconductor chip. The field plate comprises a first portion extending from a first pn junction and a second portion extending from a second pn junction, with each portion having optimized width characteristics for its specific region. This segmentation allows the protection element to provide differentiated electrostatic protection across the chip while maintaining overall design simplicity.
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 configuration enables improved electrostatic breakdown resistance with reduced size and design complexity, allowing for efficient protection against electrostatic surges while minimizing the need for extensive redesign and size increases.
Implementation Method 1
a bipolar transistor whose base region and emitter region are electrically coupled together through a resistance region
Data Source
AI summary
An electrostatic protection element whose electrostatic breakdown resistance can be adjusted with a required minimum design change is provided.A semiconductor device includes an electrostatic protection element including a bipolar transistor whose base region and emitter region are electrically coupled together through a resistance region. At this time, the base region of the electrostatic protection element has a side including a facing portion that faces the collector region. The facing portion of the side includes an exposed portion that is exposed from an emitter wiring in plan view and a covered portion that is covered by the emitter wiring in plan view.