Q.What is the difference between common mode impedance, differential mode impedance and characteristic impedance? A. Common mode impedance: refers to a characteristic in response to common mode signals (noise). Differential mode impedance: refers to a characteristic in response to leakage inductance. Characteristic impedance: refers to the line impedance when two lines of a common mode filter / choke are considered as a differential transmission line. It has no correlation with the common mode impedance. It is determined by the balance between the leakage impedance and the line capacity.
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