Precautions in designing characters and high frequency PCB wiring design

When designing PCB characters, be careful not to overlap with pads. If the PCB is overlapped on the pad, the final fabrication of the PCB will result in defects. 2: The character design of PCB board should not be placed on the hole drilling. If it is overlapped on the PCB drilling, the PCB board will also be incomplete after final fabrication.

1: When designing PCB board characters, pay attention not to overlap with pads. If the PCB is overlapped on the pad, the final fabrication of the PCB will result in defects.

2: The PCB character design should not be placed on the hole drilling. If it is overlapped on the hole drilling, the PCB will also be incomplete after final fabrication.

3: The design height of characters on PCB board should be 1mm. The character line width is 0.2mm. The characters printed in this way are clear and generous. Of course, it should also be determined according to the final PCB board size. The character parameters of the large board should be larger and the character parameters of the small board should be smaller, so it seems that the proportion is coordinated.

4: Do not overlap characters on PCB. Otherwise, it cannot be distinguished after printing.

Pcb board characters

Matters needing attention in wiring design of high frequency circuit board

Reasonably select the number of layers When wiring high-frequency circuit boards in PCB design, use the middle inner plane as the power and ground layers, which can play a shielding role, effectively reduce parasitic inductance, shorten the length of signal lines, and reduce cross interference between signals

1) Reasonably select the number of layers When wiring high frequency circuit boards in PCB design, the middle inner layer plane is used as the power and ground layers, which can play a shielding role, effectively reduce parasitic inductance, shorten the length of signal lines, and reduce cross interference between signals. Generally, the noise of the four layer board is 20 dB lower than that of the two layer board.

2) Wiring method When wiring high-frequency circuit boards in PCB design, the wiring must turn at an angle of 45 ° to reduce the transmission of high-frequency signals and mutual coupling.

3) Routing length When routing high-frequency circuit boards in PCB design, the shorter the routing length, the better, and the shorter the parallel distance between two lines, the better.

4) Number of vias When wiring high-frequency circuit boards in PCB design, the less the number of vias, the better.

5) Inter layer wiring direction When wiring high-frequency circuit boards in PCB design, the inter layer wiring direction should be vertical, that is, the top layer is horizontal and the bottom layer is vertical, so as to reduce the interference between signals.

High frequency circuit board

6) Copper coating When wiring high frequency circuit boards in PCB design, adding grounded copper coating can reduce the interference between signals.

7) Wrapped Ground When wiring high frequency circuit boards in PCB design, wrap ground processing of important signal lines can significantly improve the anti-interference ability of this signal. Of course, you can also wrap ground processing of interference sources so that they cannot interfere with other signals.

High frequency circuit board

8) When the signal line is routed to the high frequency circuit board in PCB design, the signal line cannot be looped and needs to be routed in daisy chain mode.

9) When the decoupling capacitor is used for wiring the high-frequency circuit board in PCB design, the decoupling capacitor is bridged at the power supply end of the integrated circuit.