6 Layer Gold Finger Printed Circuit Board

What is characteristic impedance in PCB?

Characteristic impedance: also known as "Characteristic impedance CPB", it is not a DC resistance, it belongs to the concept of long-term transmission. In the high frequency range, where the signal edge arrives during signal transmission, an instantaneous current will be generated between the signal line and the reference PCB plane (power or ground plane) due to the establishment of an electric field. If the transmission line is isotropic, then as long as When the signal is transmitting, there is always a current I, and if the output level of the signal is V, the transmission line will be equivalent to a resistance during the signal transmission process, the size is V/I, and this equivalent resistance is called The buile-up printed board characteristic impedance PCB Z of the transmission line. In the process of signal transmission, if the buile-up printed board characteristic impedance on the transmission path changes, the signal will be reflected at the node where the impedance is discontinuous. 

Pcbcoming is a professional company which can supply one -stop sevices including cheap custom pcb fabrication,mulit-wiring printed board,Rigid-Flex Board,PCB Assembly products.