Reverse-Geometry RC Equalizer Layout for Lower ESL

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Solution Overview

Problem

Existing surface mountable RC equalizer circuits fail to meet current requirements for increased resonance frequency and useful frequency range due to high equivalent series inductance (ESL).

Innovation Solution

A parallel RC circuit with reduced ESL is achieved through selective placement of termination material and internal connections, including a centrally located extended ground termination, and the use of a monolithic substrate with a capacitor and resistor configuration that reduces ESL, thereby increasing resonance frequency and useful frequency range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional surface mountable RC equalizer circuits are used, then the device structure is simple and easy to manufacture, but the equivalent series inductance (ESL) is high which limits resonance frequency and useful frequency range

Engineering Contradiction:

Improveresonance frequency and useful frequency rangeVSAvoidtermination material placement and internal connections

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent transitions from planar termination placement to three-dimensional termination positioning around the capacitor body. Termination points are arranged in a spatial configuration that minimizes the current loop area, thereby reducing equivalent series inductance (ESL) and enabling higher resonance frequencies while maintaining manufacturing feasibility.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent applies different termination material properties and configurations to specific locations around the capacitor. By optimizing the local termination characteristics at different positions, the overall ESL is minimized while maintaining ease of manufacture through standardized local solutions.

Inventive Principle:

Principle #3Local quality

2Speed

If ESL is reduced through selective termination placement, then resonance frequency and useful frequency range increase, but manufacturing complexity increases

Engineering Contradiction:

Improveresonance frequencyVSAvoidtermination material placement

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The termination structure is divided into multiple discrete termination points positioned at specific locations around the capacitor. This segmentation allows each termination point to be optimized independently for minimal ESL while maintaining standardized manufacturing processes for each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediate connection structures that facilitate the connection between termination materials and capacitor terminals. These intermediaries simplify the manufacturing process by providing standardized connection interfaces while maintaining the optimized spatial arrangement necessary for low ESL.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10476465B2Parallel RC circuit equalizers

Publication Date: 2019.11.12 KYOCERA AVX COMPONENTS CORP

AI summary

Disclosed are apparatus and methodology for increasing the resonance frequency and useful frequency range of surface mount RC equalizer devices. The presently disclosed subject matter provides improved operational characteristics of generally known such RC equalizer devices by implementing a reverse geometry that relocates the internal termination points, as well as external termination points for such devices, along lateral portions of the assembled device. Such reverse geometry achieves improvements by providing a reduction of the equivalent series inductance (ESL) to provide the increased resonance frequency and useful frequency range.