The use of an inappropriate filter destroys the signal, which has a high differential insertion loss in the signal frequency range or does not match the transmission line impedance. Therefore, do not choose the filter that will affect the signal quality before insertion.
If the transmission line does not match the impedance characteristics of the common mode choke coil signal reflection or other phenomena will occur and affect the signal quality. Signal lines related to the requirements of the requirements: 1Gps above the speed of high-speed transmission, the impedance characteristics must match.
In order to maintain the signal quality, to avoid such as voltage fluctuations, etc., it is important to select the signal frequency in the differential mode loss of small common-mode choke coil.
When the noise level is large, it is basically transmitted in the form of common mode, said the common mode choke manufacturers .
To prevent the generation of noise, the key is to use the common frequency of the common mode insertion loss of common mode choke coil.
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