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Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University

Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University

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Produce Your Own PCB Board Jack Ou Engineering Science Sonoma State University

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  1. Produce Your Own PCB BoardJack OuEngineering ScienceSonoma State University

  2. Four-Bit Adder-Subtractor (4 bit ripple adder)

  3. A Four-Bit Adder/Subtractor on Breadboard Problem: too many wires!

  4. Add Components

  5. AND

  6. Schematic

  7. Tips • Double click to terminate a wire

  8. Add Junction to the Schematic Add junction to the schematic.

  9. Add Power and Gnd of Each IC Chip to the schematic 1. Right click on a part (74LS08N in this example) 2. Click on Invoke

  10. Invoke a Part Select PWRN, Press OK.

  11. Power and Ground Added

  12. Move • Use the Move button to alter any component’s location Click on + to move a part

  13. Delete

  14. Display Net Name 1. Enter a net name 2. Display the netname

  15. ERC error Use ERC to check connectivity of the wire.

  16. Rewire to Clear ERC Error

  17. To Start a New Board File

  18. Board Editor If you keep both windows open, changes made on the schematic window will be reflected in the layout window.

  19. Turn on the Grid

  20. Rearrange the Comopnents (Right-Click to rotate a component) (The smaller the board, the more economical)

  21. Click on Route to Start Wiring Up the Circuit (Left click to select air wire to route) Double click To remove wire

  22. Routing Menu Add angel to the wiring (Width of a wire) (Two Metal Layers) You should select the width of the wire to be 0.04 inches (40 mils) or greater.

  23. Reduce the Active Area Hieight is 2.5 inches

  24. Load the Design Rules

  25. Minimum Width of 40 miles

  26. Change Clearance Distance

  27. Outer Via Dimensions

  28. Alternative: Load the default autorouter file

  29. Auto Router Click this option to start autoroute

  30. Result of Auto Route 2 metal layers used Not area efficient

  31. Use only the top metal layer for layout

  32. Header Termination Terminate the traces going to the header at the bottom metal layer Reason: this is where the IC will be soldered. Header terminates at the top metal layer—not a good practice

  33. How to Change Metal Layer Step 1: Click on ripup, double click a wire to delete.

  34. How to Change Metal Layer Step 2: Move the wires to create sapce

  35. How to Change Metal Layer Step 3: Route wire. Start routing at the top metal level. Step 4: Click once to place the wire in an empty area. Step 5: Switch to the bottom layer Step 6: Make contact with the pad at the bottom layer

  36. Change the Shape of Via to Round

  37. Round Via

  38. Magnified View

  39. A Sample Eagle Layout Clean up the metal layer

  40. Jumpers • You will need to use physical wires as jumpers in places where you can’t route across existing copper trace.

  41. Add Vias • Add Vias • Drill 0.03149 (Assumptions: 1. drill bit is approximately 31 mils in diameter 2. wire size is 29 mils) • Diameter 0.056 (56 mils)

  42. Provide Connection Via Jumper (Right click to bend the wire by 45 degrees)

  43. A Sample Layout

  44. Display only the necessary Metal Layers

  45. Print Only Necessary Metal Layers (Show Bottom trace, pads, and via)