Noise filter installation structure

Abstract

The present invention provides a noise filter mounting structure capable of effectively removing common-mode noise of a transmission line including three wires. The transmission line includes three wires formed on the substrate. Each wire carries a signal of three valued levels. A common mode choke coil is inserted in the transmission line. The common mode choke coil includes three coils coupled to each other and three pairs of external electrodes respectively connected to both ends of the respective coils. The external electrodes of the common mode choke coil are connected to the transmission line by inserting the three coils in series with the three wires.

Description

technical field [0001] The present invention relates to a noise filter mounting structure for removing common mode noise. Background technique [0002] The mipi D-PHY specification is defined as a signal interface between integrated circuit elements in mobile devices and display and camera modules. In the D-PHY standard, a differential transmission method is used in which signals transmitted on two wires have a mutual anti-phase relationship. A common mode choke coil is used as a noise filter for removing common mode noise in a transmission line using a differential transmission method, which hardly affects the transmitted signal. The common mode choke consists of two coils coupled to each other. The two coils are respectively inserted into the two wires in series. [0003] Non-Patent Document 1: mipi D-PHY Specification v1.2 (http: / / mipi.org / specifications / physical-layer#D-PHY Specification) [0004] In recent years, a transmission method with three wires (mipi C-PHY sp...

AI Technical Summary

Problems solved by technology

Therefore, if an existing common mode choke coil is inserted into each group of two wires selected from the three wires, the signal waveform will be deformed

As a result, normal data transfer is difficult

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