Modify Circuit Board Design by Reverse Engineering PCB Board is a commonly way for exisiting PCB board design improvement, the wiring layout design on the printed circuit board should generally pay attention to the following points:
- The printed circuit board is a flat surface and cannot be cross wired. However, instead of seeking a very tortuous path on the board, it is better to adopt a method of bridging through components.
- The wiring should not be made into a loop, especially not around the printed circuit board.
- Don’t have long narrow strips in parallel, as a last resort, set narrow strips for isolation between the narrow strips;
- The lead wire of the bypass capacitor cannot be long, and it is allowed to be a high-frequency bypass capacitor. It should be considered to be directly grounded without the lead wire.
5, the input and output lines of the unit circuit. Should be isolated with a ground wire. Otherwise it will cause parasitic capacitance between the lines. - The logic ground and analog ground should be wired separately and cannot be used together. Connect their respective ground wires to the corresponding power ground wires.
- The signal line should be as short as possible. Priority is given to small signal lines. Double-sided wiring is used to make the spacing as wide as possible. When wiring, the printed leads on the component surface and the soldering surface are preferably perpendicular to each other to reduce Qisheng capacitor, as far as possible, do not route between integrated chip pins. To receive
Add a ground wire to the interfering parts or surround it with a wide ground wire. - The signal line should be as short as possible. Priority is given to small signal lines. Double-sided wiring is used to make the spacing as wide as possible. When wiring, the printed leads on the component surface and the soldering surface are preferably perpendicular to each other to reduce Qisheng capacitor, as far as possible, do not route between integrated chip pins. To receive
- Add a ground wire to the interfering parts or surround it with a wide ground wire.
- The width of the data line and the power line should be as wide as possible to reduce the impedance. The width of the data line is at least not less than 0.3 mm (1 2 mil), if 0.46-0.5mm, 18-20 mil is used Ideal.
- Because a via on the circuit board will bring about 10 PF capacitance effect, which will introduce too much interference to high-frequency circuits. Therefore, the number of vias should be reduced as much as possible when wiring. And, Many vias will also reduce the mechanical strength of the circuit board;
