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W hat is impedance control in pcb ? High Speed PCB with Impedance Control Impedance Control PCB  refers to the PCB that needs impedance control. Impedance control refers to the “resistance” generated by a certain circuit layer under its high-frequency signal to its reference layer, and its signal must be controlled within the rated range to ensure that the signal is not distorted during transmission. Impedance control is to make each part of the system have the same impedance value, that is, impedance matching. Most high speed circuit boards currently have impedance control requirements. Therefore, it has also been said that a PCB board that does not have impedance control cannot be called a high speed PCB. Definition & Types of Characteristic Impedance At a certain frequency, the resistance of a high frequency signal or electromagnetic wave in the propagation of a signal line of an electronic device relative to a certain reference layer is called a char...