High Frequency Printed Circuit Board Design Drawing Cloning must take the grounding issue of whole electronical system, the gerber file and layout scheme extracted from high frequency PCB board must follow the principle of multi-point grounding for High Frequency Printed Circuit Board, the grounding wire of each circuit should reduce its impedance as much as possible, that is, the shorter the grounding wire, the better, so each circuit should be grounded nearby.
In this way, because the ground wire is short and the impedance is low, it can prevent the ground wire from radiating noise at high frequencies; because the ground wire impedance is low and away from each other, the magnetic field coupling and electric field coupling of the noise are greatly reduced.
Generally speaking, when the frequency is lower than 1 MHz, one-point grounding method can be used; when the frequency is higher than 10 MHz, multi-point grounding method should be used; if the frequency is between 1-10 MHz, if one-point grounding is used, the length of the ground wire must not be Exceed 1/20 of the wavelength, otherwise multi-point grounding should be used.
The connection principle of ground wires of different natures when weak signal analog circuits, digital circuits and high power drive circuits are mixed, strong signal ground wires should be separated from weak signal ground wires; analog ground wires should be separated from digital ground wires; The ground should be separated from the low-level signal ground;
The ground wires of each subsystem can only be connected to the ground at the power supply point. Only in this way can it be ensured that several ground wire systems have a uniform ground potential and avoid the formation of a common impedance.
