Voltage Divider Circuit Hydrogen Protection Segmentation
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Solution Overview
Problem
Existing voltage divider circuits in semiconductor devices face challenges in maintaining detection accuracy due to temporal changes in resistance values caused by hydrogen infiltration, which also leads to an increase in the area of the voltage divider circuit region.
Innovation Solution
A voltage divider circuit design that includes multiple resistance groups connected between terminals, with metal films covering parts of the resistance groups to reduce potential differences and minimize area expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal film covers the entirety of multiple resistance elements to suppress hydrogen infiltration, then reliability is improved, but area of the voltage divider circuit region increases
Solution Approach 1:
The voltage divider circuit is divided into two separate resistance groups (first resistance group and second resistance group) with different metal film coverage patterns. The first metal film covers part of the first resistance group, and the second metal film covers part of the second resistance group and part of the first resistance group. This segmentation allows selective hydrogen protection while minimizing total metal film area.
Solution Approach 2:
Different regions of the resistance elements receive different levels of protection. The metal films are strategically positioned to cover only the most critical regions susceptible to hydrogen infiltration, rather than uniformly covering all resistance elements. This local quality approach protects against hydrogen infiltration while reducing overall area consumption.
2Measurement precision
If multiple resistance elements are used in the voltage divider circuit, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The first and second resistance groups are merged into a single integrated structure with shared metal film coverage. The second metal film simultaneously covers part of the second resistance group and part of the first resistance group, creating a unified protective structure that simplifies manufacturing while maintaining the precision benefits of multiple resistance elements.
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 design effectively reduces changes in the voltage divider output voltage due to resistance value changes and suppresses the increase in the voltage divider circuit area, thereby enhancing detection accuracy and maintaining a compact circuit layout.
Implementation Method 1
it is known that the resistance value of the polycrystalline silicon resistance element changes according to the hydrogen content. During the manufacturing process of polycrystalline silicon resistance elements, hydrogen may infiltrate the polycrystalline silicon resistance elements
Data Source
AI summary
A voltage divider circuit includes: a first terminal; a second terminal; a voltage divider output terminal; a first resistance group in which multiple resistance elements are connected between the first terminal and the voltage divider output terminal; a second resistance group in which multiple resistance elements are connected between the second terminal and the voltage divider output terminal; a first metal film connected to the first terminal and covering a region including at least a part of the first resistance group in plan view; and a second metal film connected to the second terminal and covering a region including at least a part of the second resistance group in plan view, and the second metal film further covers a part of the first resistance group.