Conductive Polymer Capacitor Layout for Low ESL Decoupling
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Solution Overview
Problem
Solid electrolytic capacitors struggle to meet the requirements of high-frequency applications and low inductance needed for decoupling and high-speed switching due to their inability to maintain low Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL) at lower voltages and higher currents.
Innovation Solution
A solid electrolytic capacitor design featuring a sintered anode body, dielectric, and conductive polymer electrolyte with specific configurations and terminations that achieve low ESL values (1 nanohenry or less) and ESR values (800 mohms or less), maintaining stability under high temperatures and humidity, and providing robust broadband decoupling and high-speed switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If decoupling capacitors are designed for high-speed switching applications, then switching speed improves, but the requirement for lower inductance becomes a serious limitation for system performance
Solution Approach 1:
Multiple capacitor elements are segmented and arranged in parallel configurations with interconnected terminations. This segmentation creates multiple current paths that reduce the overall inductance of the capacitor assembly, enabling high-speed switching applications while maintaining the necessary decoupling performance.
Solution Approach 2:
Multiple capacitor elements are merged into a single integrated component with shared terminations connected through a low-inductance substrate. This combining approach achieves the low inductance required for high-speed switching while providing the cumulative capacitance needed for effective decoupling.
2Device complexity
If capacitors are miniaturized to reduce the number of components needed, then device complexity and space requirements decrease, but maintaining low ESL and ESR values becomes more difficult
Solution Approach 1:
Multiple capacitor functions are merged into a single integrated component. The patent combines multiple capacitor elements with optimized termination arrangements into one device, replacing what would traditionally require multiple separate capacitors. This merging maintains low ESL and ESR values through careful design of the internal configuration and termination geometry.
Solution Approach 2:
The capacitor design uses a planar configuration that optimizes the arrangement of elements and terminations in two dimensions. This dimensional approach allows for compact packaging while maintaining the current path geometry necessary for low inductance and effective decoupling performance.
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 capacitor exhibits low ESL and ESR values across a wide range of frequencies and conditions, enabling effective decoupling and high-speed switching, reducing the need for multiple capacitors and allowing for miniaturization while maintaining excellent DC power filtering and low leakage current.
Implementation Method 1
a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric and includes a conductive polymer
Implementation Method 2
the solid electrolyte includes a conductive polymer
Implementation Method 3
a sintered anode body
Data Source
AI summary
A capacitor that is capable of exhibiting good electrical properties under a wide variety of different conditions is provided. The capacitor contains a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric and includes a conductive polymer. The capacitor also contains multiple exposed anode lead portions that are electrically connected to respective anode terminations and a planar cathode termination that is electrically connected to the solid electrolyte.