Three-terminal Capacitor Electrode Width for ESL Reduction
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Solution Overview
Problem
Three-terminal laminated capacitors face challenges in reducing equivalent series inductance (ESL) when connected to IC chips, leading to source voltage fluctuations and instability.
Innovation Solution
The design includes a capacitor with specific configurations of inner and outer electrodes, where the width of certain electrode portions on the side surfaces is greater than on the main surfaces, allowing for reduced ESL without compromising electrical contact or increasing the length of outer electrode portions on the main surfaces, and incorporating via hole electrodes for improved connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of outer electrode portions on side surfaces is increased to reduce ESL, then the electrical contact area on main surfaces may be reduced
Solution Approach 1:
The patent applies local quality by making different portions of the third outer electrode have different widths in the length direction. Specifically, the first portion (on the first side surface) has a greater width than the second portion (on the first main surface). This localized dimensional variation allows the electrode to provide both low ESL through increased side surface width and adequate electrical contact through maintained main surface connectivity, resolving the technical contradiction between ESL reduction and contact area preservation
2Area of stationary object
If the length of outer electrode portions on main surfaces is increased to improve electrical contact, then the ESL reduction may be compromised
Solution Approach 1:
The patent resolves this contradiction by applying local quality differently - making the first portion of the third outer electrode (on the side surface) wider in the length direction while keeping the second portion (on the main surface) with adequate but not excessive width. This localized differentiation allows ESL reduction through increased side surface electrode width without requiring increased main surface electrode length, thus maintaining both low ESL and adequate electrical contact
3Ease of operation
If the third outer electrode extends to end surfaces to improve connectivity, then the complexity of electrode configuration increases
Solution Approach 1:
The patent applies the taking out principle by explicitly excluding the first and second end surfaces from the extent of the third outer electrode. The specification clearly states that the first portion does not extend to the first and second end surfaces. This extraction of the end surface portions simplifies the electrode configuration while maintaining adequate connectivity through the side surface and main surface portions, resolving the contradiction between connectivity and complexity
Data Source
AI summary
In a capacitor, a width in a length direction of a first portion of a third outer electrode, which is a portion located on a first side surface, is greater than a width in a length direction of a second portion of the third outer electrode, which is a portion located on a first main surface. The first portion of the third outer electrode does not extend to first and second end surfaces.