Printed Circuit Board
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A printed circuit board (PCB) connects circuit components through alternating conducting and insulating layers on a board. PCBs make circuits compact, reliable, and affordable compared to other construction methods like wire wrap. Designing a PCB involves using EDA software to create a schematic, place components, route wires between them, and generate manufacturing files to send to a PCB fabricator. While PCBs have an initial higher cost than other methods, they allow for portable and reliable circuits.
Printed Circuit Board
- 1. Printed Circuit Board NITIN KAILA M. 126540319513 1 http://saturnpcb.com/pcb_services.htm
- 2. Overview What is a PCB? Why use a PCB? How do I make a PCB? 2
- 3. Printed Circuit Board Circuit connects components through board Made of alternating layers of conducting and insulating materials 3 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 4 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 5
- 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 6
- 7. Schematic Capture Pin in/outs Components Interconnections Easily Readable High-Level Block Diagram 7 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 Rats Nest 8
- 9. Placement of Components Place big components first- e.g. microcontroller Place components in separate functional groups Put a ground plane under all components 9
- 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 10 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 11
- 12. Vias and Pads Vias are connections between layers Pads are copper areas for pin connections 12
- 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 13
- 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 17
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