(1) Power line

     Depending on the size of the circuit board, the width of the power line is thicker as much as possible to reduce the circular resistance. In particular, pay attention to the power supply direction of the power line and the ground line, which is the opposite of the transmission direction of data and signals, that is, the power supply method promoted from the last level to the advanced level, which helps enhance the anti -noise ability.

     (2) ground wire

     The principle of design is) digitally separated from simulation. If there is both logical circuit and a wired circuit on the circuit board, they should be separated as possible. Low The ground of the frequency circuit should be used as a single point and connecting the ground. When the actual wiring is difficult, it can be partially connected in series before connecting the ground. The high -frequency circuit should adopt a multi -point connected ground, the ground line should be rented short and rent, and the high -frequency component device should be used as a grid -like large -scale floor foil as much as possible. The grounding line should be as thick as possible. If the ground wire is used with very railing lines, the ground potential will change with the changes in the current to reduce the anti -noise performance. Therefore, the grounding line should be thicker so that it can three times the allowable current on the printed board. If possible, the ground line should be above 2 to 3mm. The ground line constitutes a closed loop. The printed board consisting of digital circuits can mostly improve the anti -noise capacity.