ppt

1. Printed Circuit Board
NITIN KAILA M.
126540319513
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http://saturnpcb.com/pcb_services.htm

2. Overview
• What is a PCB?
• Why use a PCB?
• How do I make a PCB?
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3. Printed Circuit Board

Circuit connects components through board

Made of alternating layers of conducting and
insulating materials
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http://www.seilpcb.co.kr/products/images/2_1_img5.gif

4. Why PCB?
• Features
• Surprisingly Affordable
• Highly reliable
• Compact
• Drawbacks
• Requires more layout than other board types
• Higher initial cost than wire wrap or point-to-
point construction
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http://en.wikipedia.org/wiki/File:Breadboard_complex.jpg

5. PCB Design Steps
1 Design the circuit
2 Place the components
3 Route the wires
4 Manufacture
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6. EDA Software
• PCB design software package
• Design the circuit (Schematics editor)
• Place the components (PCB editor)
• Route the wires (Autorouter module)
• Examples:
• EAGLE
• ExpressPCB
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7. Schematic Capture

Pin in/outs

Components

Interconnections

Easily Readable

High-Level Block
Diagram
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All pictures of schematics and EAGLE screenshots from http://www.sparkfun.com/tutorials/108
and http://www.sparkfun.com/tutorials/109

8. Placement of Components
• Rat’s Nest
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9. Placement of Components
• Place big components first- e.g. microcontroller
• Place components in separate functional groups
• Put a ground plane under all components
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10. Signal Routing Component Placement
• Surface mount
• Top and bottom planes
• Minimal routing area
• Through-hole mounted
• All components on same side
• Reduces routing area on all planes
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http://www.ehow.com/how_8306661_solder-mini-components.html
http://blog.amal.net/?p=188

11. Signal Routing
• Traces are wires connecting components
• Traces can be routed through multiple layers
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12. Vias and Pads
• Vias are connections between layers
• Pads are copper areas for pin connections
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13. Manufacturing Files
• Gerber Files
• Industry standard file format to describe circuits
• Generated by PCB design software
• Contains all necessary info to manufacture a
circuit board (Traces, Pads, Silkscreen, etc.)
• Drill Files
• Describes the location and size of holes
• Zipped with Gerber files and sent to manufacturer
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14. Viewplot Check
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15. Cost Estimate
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•www.pcbfabexpress.com

16. Cost Estimate
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•www.sunstone.com

17. Summary
• PCBs allow for portable and reliable circuits
• Designed in EDA Software
▫ Design the circuit
▫ Place the components
▫ Route the wires
▫ Manufacture
• Price varies based on size and urgency
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