Network interface with filtering device

Abstract

A network interface with filtering device consists of connector of integrate network interface transformer, power input pin of network interface transformer and filtering device. The said filtering device consists of inductive component connected to external power, capacitive component connected on ground, two said components common node connected to power input pin of network interface transformer. It features that each filtering device corresponds to a network interface and each filtering device is connected to external power and network interface power input pin separately.

Description

technical field [0001] The invention relates to a technology for reducing high-frequency electromagnetic radiation of an Ethernet network port, especially a network port with a filtering device. Background technique [0002] With the development of Ethernet technology, a large number of devices using Gigabit Ethernet are popularized. A network port with a filter device in the prior art is generally shown in FIG. 1 . [0003] In Figure 1, a network port transformer and a network port connector form a Gigabit Ethernet port. The PHY (physical layer) chip outputs Gigabit Ethernet data signals through each Gigabit Ethernet port. CT (Center Tap) is the power input pin of the network port transformer. The current input by the external power supply Vin, after passing through the filter circuit composed of magnetic beads L and capacitor C, becomes Vct, and is sent to the network port transformer through the CT pin. Figure 1 shows the three-way network port transformer and network ...

AI Technical Summary

Problems solved by technology

However, due to the frequency characteristics of various filter capacitors and the parasitic inductance introduced by PCB wiring, they are only very effective for filtering high-frequency electromagnetic signals above 500M, so the efficiency of filter capacitors is low. lead to a substantial increase in equipment costs

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