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Method for a common-mode choke for USB 2.0 EMI filter solution utilizing multilayer technology

IP.com Disclosure Number: IPCOM000012713D
Publication Date: 2003-May-21
Document File: 3 page(s) / 103K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a common mode choke for USB 2.0 (Universal Serial Bus Specification Revision 2.0, 4-27-2000) electromagnetic interference (EMI) filter solution utilizing multilayer technology. Benefits include improved performance and improved cost effectiveness.

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Method for a common-mode choke for USB 2.0 EMI filter solution utilizing multilayer technology

Disclosed is a method for a common mode choke for USB 2.0 (Universal Serial Bus Specification Revision 2.0, 4-27-2000) electromagnetic interference (EMI) filter solution utilizing multilayer technology. Benefits include improved performance and improved cost effectiveness.

Background

        � � � � � The conventional USB 2.0 EMI solution to filter common mode noise is expensive because common-mode choke coils are developed using wire wound technology (see Figure 1). It is labor intensive, utilizing expensive materials and machineries with a lower yield rate. Multilayer technology utilizes cheaper material and has a mature automated process with high yield.

        � � � � � The conventional common-mode choke design uses different types of construction using a coil. Wires are wounded on a core material (such as a Fe2O3 composition) either vertically or horizontally. The tips of the wires are soldered to the terminals of the material to achieve the target impedance, rated current, and direct current resistance (DCR).

General description

        � � � � � The disclosed method is a multilayer technology for a common-mode choke to reduce component cost. A similar multilayer technology is widely used to produce a multilayer ceramic capacitor (MLCC) and ferrite beads.

Advantages

        � � � � � The disclosed method provides advantages, including:

•        � � � � Improved performance due to producing equivalent or better...