High Voltage IC Aperture Structure for Surge Protection
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Solution Overview
Problem
High voltage integrated circuit devices face malfunction and destruction due to excessive hole current implantation caused by negative voltage surges, which existing technologies fail to adequately prevent without increasing chip size or compromising functionality.
Innovation Solution
A high voltage integrated circuit device configuration featuring a p-type aperture portion with a gap portion, encasing the Vs potential region and including pickup electrodes, which suppresses excessive hole current implantation by creating a potential barrier and maintaining efficient layout, thereby preventing high side circuit malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protection methods are used against negative voltage surges, then circuit reliability is improved, but chip area increases
Solution Approach 1:
The aperture portion is divided into multiple segments (first aperture portion, second aperture portion, third aperture portion) that collectively enclose the Vs potential region. This segmentation allows effective protection against hole current implantation while optimizing the use of chip area, as each segment can be strategically positioned to block current paths without requiring a completely enclosed structure.
Solution Approach 2:
The aperture portion is positioned specifically at locations where hole current implantation is most likely to occur, such as near the Vs potential region and high concentration regions. This localized protection approach concentrates protection resources where they are most needed, preventing circuit malfunction without requiring comprehensive coverage of the entire chip area.
2Reliability
If aperture portion is added to prevent hole current implantation, then circuit protection is improved, but device complexity increases
Solution Approach 1:
The aperture portion is integrated with existing chip structures such as the Vs potential region, high concentration regions, and other circuit elements. By merging the protection function with existing structural elements rather than adding completely separate protection components, the device complexity is minimized while still achieving effective protection against negative voltage surges.
3Measurement precision
If pickup electrodes are positioned near Vs potential region, then signal detection efficiency is improved, but vulnerability to hole current implantation increases
Solution Approach 1:
The aperture portion is positioned to preemptively block hole current paths before they can reach the pickup electrodes or Vs potential region. This preliminary protective action creates a barrier that prevents harmful carriers from implanting into sensitive areas, allowing the pickup electrodes to maintain their optimal positioning for signal detection without being vulnerable to damage.
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 prevents high side circuit malfunction and destruction from negative voltage surges without increasing chip area, by reducing hole carrier implantation and maintaining signal integrity.
Implementation Method 1
suppresses excessive hole current implantation by creating a potential barrier
Data Source
AI summary
A high voltage integrated circuit device suppresses the quantity of holes that are implanted due to a negative voltage surge, thus preventing malfunction and destruction of a high side circuit. A p−-type aperture portion has a gap portion in an n-type well region that is a voltage resistant region, penetrating the n-type well region to reach a p-type substrate, so as to enclose an n-type well region that is a high potential region.