Transient Voltage Suppression Device Seal-Ring Doping
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Solution Overview
Problem
As electronic devices become smaller and more compact, their ability to withstand high-power electrostatic discharge and surges is reduced, making it challenging to effectively protect them within a limited layout area.
Innovation Solution
A transient voltage suppression device is designed with a doped region in the seal-ring region electrically connected to a transient voltage suppressor, increasing the effective area and enhancing resistance to electrostatic discharge and surge, and additional doped regions in the scribe line region to shunt discharge currents, combined with multiple Zener diodes for bi-directional discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If device size is reduced to achieve compact design, then device area is decreased, but protection capability against electrostatic discharge and surge is reduced
Solution Approach 1:
The patent extends the protection structure from the device region into the seal-ring region by adding a doped region that protrudes beyond the device region boundary. This dimensional extension allows the transient voltage suppressor to utilize space in the seal-ring region, effectively increasing the protection capability without increasing the overall device footprint, thus resolving the contradiction between compact size and protection capability.
Solution Approach 2:
The protection structure is segmented into multiple functional regions: the device region containing the transient voltage suppressor, and the seal-ring region containing the extended doped region. This segmentation allows the protection function to be distributed across different spatial zones, enabling the suppressor to maintain high protection capability while the overall device remains compact.
2Reliability
If device area is increased to enhance protection capability, then resistance to electrostatic discharge and surge is improved, but layout area becomes larger
Solution Approach 1:
The seal-ring region, which traditionally serves only as an isolation or protection boundary, is given a dual function: it continues to provide its original seal-ring functionality while also housing the extended doped region of the transient voltage suppressor. This multi-functionality allows the suppressor to achieve larger effective area for better ESD and surge resistance without requiring additional layout area beyond the existing device boundaries.
3Reliability
If doped region is extended into seal-ring region to increase effective area, then protection capability is enhanced, but device structure becomes more complex
Solution Approach 1:
The patent merges the transient voltage suppressor structure with the seal-ring region by having the doped region extend into and integrate with the existing seal-ring structure. This merging approach allows the suppressor to utilize the seal-ring region as part of its functional structure rather than treating it as a separate element, thereby enhancing protection capability while minimizing the increase in overall device structural complexity.
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 solution effectively increases the protection capability against electrostatic discharge and surge within a limited layout area by enhancing the effective area and operation speed, while also lowering equivalent capacitance.
Implementation Method 1
A third doped region having the second conductivity type is located in the substrate of the seal-ring region, and the third doped region is electrically connected to the first doped region
Implementation Method 2
multiple Zener diodes for bi-directional discharge
Data Source
AI summary
A transient voltage suppression device including a substrate and a first transient voltage suppressor is provided. The substrate includes a device region and a seal-ring region. The seal-ring region surrounds the device region. A first transient voltage suppressor is located in the device region. The first transient voltage suppressor includes a first well region having a first conductivity type, a first doped region having a second conductivity type, and a second doped region having the second conductivity type. The first well region is located in the substrate of the device region. The first doped region is located in the first well region. The second doped region is located in the first well region. A third doped region having the second conductivity type is located in the substrate of the seal-ring region, and the third doped region is electrically connected to the first doped region.