Electronics Engineering
Circuits

How do you design printed circuit board?

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Wiki User
2011-12-30 20:07:10

If you want to know a printed circuit board is designed here is

the explanation in simple terms.

1. First you decide on the components which are in the

design.

2. Need a software in which you can get symbols (both schematic

symbols and physical symbols) of standard components and which also

allows you to create your own symbols for new components which are

not in the standard tool library.

3. In schematic capture tool, you will use symbols of components

and also connect the pins of components with wire lines to complete

the schematic drawing. Based on complexity and size of the design

this can be few pages or hundreds of pages.

4. In the layout tool you will have to make a board outline

(based on the shape/size of PCB you want to design) and define

number of layers etc.

5. Schematics need to be exported to layout using the board

outline you designed. Result will be that all the physical symbols

will appear in the layout tool along with un-routed wire

connections.

6. Now you can place components on the PCB based on floor plan

(where you want to place what components) and start routing the

connections. Decide thickness of routes or traces based on

impedance and current these nets need to carry. Based on how many

layers have been defined and needed as per design traces can run

through multiple layers

7. When routing is complete, with help of tool you need to

create PCB fabrication data for PCB fabricator.

These are top level steps involved in a PCB design. There are

finer steps like back annotation (process to sync up layout and

schematics) which also important. Many tools give options for auto

placement, auto routing which can aid in the design. These used

with proper constraints and care can help speed up the design

process. Check for PCB tool vendor websites.

- Neeraj

"Answer" id="Answer">Answer

Proton led displays says:

Go to www.circuitboards.com scroll down to the links area and

click free cad software by cadsoft. My friend told me the other PCB

designing software mentioned makes you pay for there software if

you want it manufactured outside of there facility. Basically

locking you into there price or no price. Cadsoft is free up to a

certain layer count I believe.


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