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Printed circuit board impedance characteristics:

May 10, 2017

According to the signal transmission theory, the signal is a function of time, distance variable, so the signal on each part of the connection is likely to change. Therefore, determine the AC impedance of the connection, that is, the voltage change and the current change ratio of the transmission line characteristic impedance (Characteristic Impedance): transmission line characteristic impedance only with the characteristics of the signal connection itself. In the actual circuit, the resistance of the wire itself is less than the distributed impedance of the system. In the high frequency circuit, the characteristic impedance depends mainly on the distributed impedance of the unit distributed capacitance and the unit distributed inductance. The characteristic impedance of the ideal transmission line depends only on the unit of distributed capacitance and the unit distributed inductance.

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