EXC-CET470U Filters

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EMI/RFI filters are used in many application fields, particularly those requiring immunity to electromagnetic interference (EMI) and radio frequency interference (RFI). An example of such an application is the EXC-CET470U, an EMI/RFI filter designed for use in Ethernet transceivers. This filter has been designed to reduce the effects of electromagnetic interference on an Ethernet link through the use of a LC (inductor-capacitor) network. The filter has been tested with various loads and in various environments to ensure that it offers maximum performance.

The working principle of an LC network filter is as follows. An LC network consists of an inductor followed by a capacitor. This configuration forms an LC resonant frequency. The resonant frequency is where the inductor\'s reactance is equivalent to the capacitance\'s reactance over a certain frequency range. This essentially forms a filter that allows only those frequencies below the resonant frequency, while blocking out frequencies above it. In the case of the EXC-CET470U, the LC resonant frequency is around 470 kHz, which is suitable for Ethernet operation.

The LC network acts to reduce EMI interference by blocking the high-frequency interference, while also reducing the strength of the remaining, low-frequency interference. This is done through a combination of rejection and electrical shielding. The rejections portion is accomplished through the LC resonant frequency; as only frequencies below the resonant frequency are allowed to pass, the filter is able to reduce the strength of the incoming EMI interference. The shielding portion is done through the use of the inductors and capacitors, which act to resist and contain the general charge that is present in EMI interference.

The EXC-CET470U EMI/RFI filter is also able to reduce RFI interference, though it is somewhat less effective at doing so. RFI interference consists of higher frequencies, typically in the hundreds ofMHz range, that can cause various problems with an Ethernet link. In order to reduce the strength of these frequencies, the EXC-CET470U uses an RC (resistor-capacitor) network. This network consists of a resistor in series with a capacitor. The RC network acts to reduce the strength of the RFI interference by providing a resistive load to the circuit, certain frequencies having more resistance than others. In this way, the filter is able to reduce the strength of the RFI interference, allowing for smoother operation of the Ethernet link.

In conclusion, the EXC-CET470U EMI/RFI filter is able to reduce the effects of both EMI and RFI interference on Ethernet links. This is accomplished through the use of both LC and RC networks. The LC network utilizes the resonant frequency that is present in its configuration to block out frequencies above this frequency, thus reducing the strength of the EMI interference. The RC network is able to reduce the strength of the RFI interference by providing a resistive load to the circuit. In this way, the EXC-CET470U is able to ensure a high level of performance in various environments.

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