Multilayer Ceramic Capacitor Interposer Layout for Lower ESL
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Solution Overview
Problem
Multilayer ceramic capacitors with increased distance between external electrodes and through conductive portions result in higher equivalent series inductance (ESL) and signal loss, particularly at high frequencies.
Innovation Solution
The design includes an interposer with through conductive portions and conductive joining agents that provide electrical conduction between external electrodes and mounting electrodes, minimizing the distance for electrical flow and reducing ESL by extending the joining regions above the through holes and using specific configurations for the conductive joining agents and metal films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between the through conductive portion and the external electrodes increases, then the mounting flexibility is improved, but the equivalent series inductance (ESL) increases and signal loss increases
Solution Approach 1:
The external electrodes are configured to extend from the end surfaces onto the main surfaces of the multilayer body, creating a three-dimensional electrode layout. This dimensional extension allows the electrodes to reach closer to the through conductive portions while maintaining mounting flexibility, effectively reducing the current path length and ESL without constraining mounting options.
Solution Approach 2:
The external electrodes are pre-configured to extend onto the main surfaces before mounting, establishing optimal electrical connection paths in advance. This preliminary electrode configuration ensures that the electrodes are already positioned to minimize ESL when the through conductive portions are formed, reducing the need for additional corrective measures.
2Adaptability or versatility
If the distance between the through conductive portion and the external electrodes increases, then the mounting flexibility is improved, but the signal loss increases
Solution Approach 1:
By extending external electrodes onto the main surfaces in the third dimension, the invention creates shorter current paths that reduce resistive losses. This spatial configuration allows electrical signals to traverse shorter distances while maintaining the ability to accommodate various mounting configurations.
Solution Approach 2:
The invention changes the geometric parameters of the external electrodes by extending them onto the main surfaces. This parameter modification directly reduces the length of the current path, thereby decreasing both ESL and signal loss while preserving mounting flexibility through the extended electrode geometry.
3Reliability
If the external electrodes are extended further onto the main surfaces, then the ESL is reduced, but the device complexity increases
Solution Approach 1:
The external electrodes merge multiple functions into a single structure: they provide electrical connection at the end surfaces and simultaneously extend onto the main surfaces to reduce ESL. This unified electrode design achieves low inductance without adding separate components, thereby reducing overall device complexity despite the extended geometry.
Solution Approach 2:
The extended external electrodes serve multiple purposes: they function as electrical terminals, provide low-inductance current paths, and maintain mounting flexibility. This multi-functionality allows a single electrode configuration to address multiple performance requirements without increasing device complexity through additional specialized components.
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 reduces ESL by allowing electricity to flow through the shortest routes, thereby minimizing signal loss and improving high-frequency performance.
Implementation Method 1
a first conductive joining agent that joins the first external electrode and the first joining electrode in an electrically conductive manner
Data Source
AI summary
A multilayer ceramic capacitor includes, on a side of a first external electrode in a length direction of an interposer, a first joining electrode on a first surface and a first mounting electrode on a second surface, a first through conductive portion penetrating the interposer, and a first conductive joining agent providing electrical conduction between the first external electrode and the first joining electrode, and includes on a side of a second external electrode, a second joining electrode on the first surface and a second mounting electrode on the second surface, a second through conductive portion penetrating the interposer, and a second conductive joining agent providing electrical conduction between the second external electrode and the second joining electrode. A first joining region joining the first external electrode and the first conductive joining agent extends directly above an end at an upper end of the first through conductive portion, and a second joining region joining the second external electrode and the second conductive joining agent extends directly above an end at an upper end of the second through conductive portion.