Cadence is a powerful EDA (Electronic Design Automation) software that covers almost every stage of electronic design, including ASIC, FPGA, and PCB development. It excels in simulation, schematic design, automatic placement and routing, layout design, and verification. With a comprehensive set of tools, Cadence offers a full solution for all aspects of EDA. If you're looking to learn how to build a PCB using Cadence, here's a step-by-step guide.
**Steps to Build a PCB Using Cadence**
1. Open the PCB Editor — "Allegro PCB Design GXL"
Start by launching the Allegro PCB Design GXL module from the Cadence suite.
2. Create a New File
Go to "File" > "New" and choose "Board (Wizard)" to start building your PCB.
3. Save the File with a New Name
Use "File" > "Save As" to change the storage path and give your file a meaningful name.
4. Set Up Design Parameters
Navigate to "Setup" > "Design Parameters..." to define units, board size, precision, and working area. The coordinates for the lower-left corner (Left X and Lower Y) should be set to negative values so that the origin lies within the working area.
5. Configure Grids
Go to "Setup" > "Grids..." to adjust the grid settings according to your design needs. This helps in precise placement of components and traces.
6. Add the Board Outline
Use "Add" > "Line" to manually create the board frame. Ensure the "Class" and "Subclass" options are correctly selected. You can either draw a rectangle or input specific coordinates for accuracy. Note that the board outline cannot be directly edited; it must be deleted and re-added if changes are needed.
7. Add Chamfers
Access "Manufacturing" > "Drafting" to add chamfers or fillets. Choose the appropriate radius (e.g., 100 mils) and click on the edges where you want to apply the chamfer. This can also be done after the main design is complete if the exact size is uncertain.
8. Place Mounting Holes
Go to "Place" > "Manually" and select "Mechanical Symbols" from the drop-down menu. Choose a suitable hole size, such as MTG125 (125 mils inner diameter), and place them at the corners of the board. After placing, go to "Edit" > "Properties" to set the hole as "Fixed."
9. Define Area Constraints (Optional)
Use "Setup" > "Areas" to set up different regions. These include:
- **Package Keepin**: Area where components can be placed.
- **Package Keepout**: Area where components cannot be placed.
- **Route Keepin**: Area where routing is allowed.
- **Route Keepout**: Area where routing is not allowed.
This process provides a clear pathway for creating a professional PCB layout using Cadence. Whether you're a beginner or an experienced designer, following these steps will help you efficiently design and verify your PCB.
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