PCB design review

In the old days, when PCB CAD software was new, we would go through and check the layout against the schematic to make sure all the connections were made.  Now, the software is pretty sophisticated and will most likely catch any disconnected nets. 

If you are working on a team and there are others that have knowledge of the design then having them review the layout for compliance with design notes, component vendor layout notes, and best practices is a good idea.  If you're working alone, that's not usually an option.  Also, you can submit the layout to a PCB company for DFM (design for manufacturing) review.  Usually this is free and will give you an indication if there is anything in the layout which will hinder manufacturing.  It will also tell you if you fit into a certain category of pricing for PCBs such as trace/space requirements, number of vias, minimum/maximum drill sizes, etc.

Hope this helps.  In the end, the best way to find if a PCB is good or not is to build one and test it.  All of the above just helps to catch dumb mistakes before you build and save time, money, etc.

There are lots of checklists on the net - like this one:

PCB Layout Checklist

First use all the tools in your CAD package to do net list checks and design rule checks - to ensure everything that should be connected is connected and no traces are too close together.

Make sure all ICs are properly connected to power rails.

Make sure all power traces on the card are wide enough to carry the required current.

Make sure you can access all signals of interest with a probe for troubleshooting. (appropriate test points)

Make sure every IC has adequate decoupling capacitors on its power pins.

Make sure all pins that need to be connected are connected.

Look for traces going nowhere (stubs).

Make sure you have appropriate mounting holes.

Thanks for your reply !

But my another great doubt is : I designed a PCB and I'm going to manufacture it by giving my design to supplier. What are the process needed to be done before manufacturing. For e.g.: DFM, DFT, etc.

Thanks in advance !

Thanks for your reply !

But my another great doubt is : I designed a PCB and I'm going to manufacture it by giving my design to supplier. What are the process needed to be done before manufacturing. For e.g.: DFM, DFT, etc.

Thanks in advance !

The manufacturer web site will usually specify exactly what their process can achieve. You can set your CAD design rules to match the manufacturer's rules. DFM, DFT, DFx can get quite involved, but there is lots of info on the net to help. The checklist above is enough to deal with on a first attempt.

Depends on the vendor. If you are using a pooling service, just send them the gerbers and they will do the rest. If you are using a Board house with NRE fees, you may want to panelize the design yourself to reduce. cost. Work with the vendor.

If you are talking about modifying the design for large volume production, that's totally different.