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PCB wiring is to lay printed wires according to PCB circuit schematic diagram, wire list and required wire width and spacing. So,PCB multilayer circuit boardWhat knowledge is required for cabling?

1. On the premise of meeting the requirements, the wiring shall be as simple as possible. The routing method is selected in the order of single-layer, double-layer and multi-layer.

2. Grounding wire shielding shall be arranged beside the input line of analog circuit; The wires in the same layer shall be evenly distributed; The conductive area of each layer shall be relatively balanced.

3. The signal line shall be inclined or smoothly transited when changing direction to avoid electric field concentration, signal reflection and additional impedance.

4. Digital circuit and analog circuit shall be separated in wiring to avoid mutual interference; The signal lines with different frequencies shall be separated by grounding wires to avoid crosstalk. For the convenience of testing, necessary breakpoints and test points shall be set in the design.

5. The circuit components shall be grounded and connected to the power supply as short and close as possible to reduce the internal resistance.

6. The upper and lower layers of wiring shall be perpendicular to each other to reduce coupling, and the upper and lower layers of wiring shall not be aligned or parallel.

7. The length of multiple I/O lines of high-speed circuit, differential amplifier, balance amplifier and other circuits shall be equal to avoid unnecessary delay or phase shift.

8. When the pcb bonding pad is connected with a large conductive area, a thin wire with a length of not less than 0.5m shall be used for thermal isolation, and the width of the thin wire shall not be less than 0.13mm.

9. The distance between the conductor close to the edge of SMB and the edge of SMB shall be more than 5mm, and the grounding wire can be close to the edge of SMB when necessary.

10. The common power cord and ground wire on the double-sided SMB should be laid near the edge of the SMB as far as possible and distributed on both sides of the SMB. Multi layer SMB can be equipped with power layer and ground wire layer in the inner layer, which are connected with power lines and ground wires of each layer through metallized holes. Large area wires, power lines and ground wires of the inner layer should be designed as a mesh.