I'm starting with my first layout (master thesis: rf frontend) in Cadence SPB 15.7 and have a lot of questions. Here are some of them:
1.) Before I start with the schematic, I think I have to create the schematic-symbols and the footprints of the ICs. I already followed a tutorial which showed how to make the padstacks and the footprints with assembly outline, silkscreen outline, package boundary. I startet with an easy footprint of the MAX4447 with SOIC 16 pins. But I have no tutorial which explains how to create the schematic-symbol and how to link it with my new footprint. Any idea where to find one?
2.) The next parts, I have to create are TSSOP20, SOT-89, QFN-LP3, 20pin MCM, 56TQFN, SOT3, SOT-666, QFN-6.
It's a lot of work and I don't know if everything I do is correct. So are there downloadable footprint packages which contain some of my needed footprints? I think I have to compare every downloaded footprint with the datasheet of the part but it would speed up my work a lot.
3.) Any other hints? =)
In reply to Khurram:
Sorry i forget to attached the utility, here it is .......
Thank you for the link, I downloaded the tool a few minutes before your post and I think it will help me a lot.
I have Cadence SPB 15.7 with "Design Entry HDL". When I start "Design Entry HDL" I have the choice between:
"Allegro Design Entry HDL L"
"Allegro PCB Design HDL L"
"Allegro PCB Design HDL XL (PCB Design Expert)"
In reply to First Layout:
Who would start a master's thesis on an expired toolset? What university are you at? What is your thesis?
In reply to redwire:
Hi Yes you will first need to have the schematic part "symbols" ready to be placed onto your schematic, and once you have a working schematic each part "symbol" will need to be assigned a "PCB Footprint", that way when you ECO (engineering change order) from your schematic into allegro, Allegro knows which footprints to call upon to bring into your layout design. so you do need schematic symbols and pcb footprints, before a layout and be proceeded with. yes 15.7 is a little old hat, I use 16.01 (even though there is 16.2 currently available) 16.3 is coming out very soon also. good luck on your design. Stephen Grant-Davies - QuantumCad.
In reply to HANUMAGOUDA:
(1) first and foremost, you should realise when you install Cadence Allegro, it will install footprint libaries for you these can be viewed and used from
you just need to open them (*.dra) ( its probably worth opening some up and experimenting here to get an idea)
eg cap300.dra ( you also might notice for every *.dra file there is also a psm this is normal and Allegro needs both of these for its ECO process.
(2) every part on your schematic needs an allocated footprint eg (cap300) you dont need to add in the .dra
once this is complete you also need to make sure in setup user preferances, Paths are set up correctly either for using cadence default lib or in case you want to use your own. alternatively to that, you can just place your *dra and *.psm files in the exact same folder as your intended .brd this way you dont need to configure paths (your choice)
(3) you should now be able to take your schematic into Allegro, oviously you might encounter isues along the way but thats generally a good starting point. good luck, it is a bit of a learning curve to use Allegro, but once you do, its one of the best PCB CAD tools on the market.
In reply to S Grant Davies:
Here is a quick tutorial for the Cadence Allegro Design Entry HDL -