1. Preliminary Work of Circuit Board Design

1.1 Schematic Design:

  • Utilize the schematic design tool to draw the schematic diagram and generate the corresponding network table.
  • In cases of simplicity, skip schematic design for pre-existing network tables.

1.2 Manual Network Table Adjustments:

  • Manually modify the network table:
    • Define pads not on the schematic, such as fixed pins, connecting them appropriately.
    • Adjust device pin names to match the PCB package library.
    • Define physically unconnected pins to ground or protection ground.

2. Drawing the Package Library of Non-Standard Devices

  • Create a dedicated design file for self-drawn components within the PCB library.

3. Setting up PCB Design Environment and Drawing the Frame

3.1 PCB Design Environment Setup:

  • Set up parameters such as grid size, cursor type, layout, and wiring parameters.
  • Parameters can often use default values, aligning with personal habits.

3.2 Circuit Board Planning:

  • Plan the board border, determining size and placement of mounting holes.
  • Before drawing the border, set the current layer to Keep Out to prohibit wiring.

4. Opening Required PCB Library Files and Loading Netlist

  • Open necessary PCB library files.
  • Load the netlist file and modify part packages if needed.
  • Netlist is crucial for automatic routing and acts as the interface between schematic design and PCB layout.

5. Arranging Part Package Positions (Part Layout)

  • Utilize Protel99 for automatic or manual layout.
  • Consider mechanical structure, heat dissipation, and electromagnetic interference during part layout.
  • Use new interactive layout options for efficient arrangement.

6. Making Adjustments and Locking Devices

  • Adjust layout as needed considering mechanical, heat, and electromagnetic factors.
  • Add fixing screw holes, test pads, and adjust via hole sizes.
  • Lock all devices after adjustments.
  • Use VIEW3D function to check the actual effect and save the design.

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