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| Chip making process |
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| Wimberleytech:
Here is some data from anysilicon.com (2016). 180nm is under $100k. |
| Wimberleytech:
--- Quote ---Interesting. I wonder if there are any companies that still offer prototyping on larger processes using direct-write, because from the discussion I gather the bulk of the $$$ in IC prototyping is in the mask (why masks are so expensive is the other question I'm curious about --- is there a ton of human labour involved, and/or do they take a very long time to make?) --- End quote --- Building a plant to produce fine-line masks can cost $100 million. Then you have to run it and depreciate it. |
| ZeroResistance:
--- Quote from: Wimberleytech on October 16, 2018, 04:47:32 pm --- --- Quote from: ZeroResistance on October 16, 2018, 04:10:07 pm ---Ok, so lets say Microchip wants to release a new 10F chip and its a 2mm^2 area per chip. The would obviously have to get it made in a foundry. What kind of costs would be they be looking at. For the masks, and for getting it made at the foundry. Would Microchip need to place an order for 1 million pcs of the chip? How do these things work out, will the foundry charge by area of silicon, that would me 2 million mm^2 of area. Packaging would be a seperate expense right? --- End quote --- Here is ballpark based on what a 0.35um flash silicided poly, 4 layers of metal, with cap poly and poly resistor options Mask costs not included here. --- End quote --- Can you elaborate how you arrived to final cost of USD 0.68. is that the final cost of a packaged chip? Also you have taken wafer cost as USD 1600 is that the cost of wafer for 0.35um process and for a quantitly of 1000 wafers / month. I mean the wafer cost would change right for a 0.18um process? |
| ZeroResistance:
These are wafer cost's from year 2014 for 200mm 0.35u it shows as USD 460. Taken from http://www.icinsights.com/news/bulletins/LeadingEdge-IC-Foundry-Market-Forecast-To-Increase-72-In-2014/ |
| Kjelt:
--- Quote from: amyk on October 17, 2018, 02:58:24 am ---why masks are so expensive is the other question I'm curious about --- is there a ton of human labour involved, and/or do they take a very long time to make?) --- End quote --- I was curious about this to. AFAIK with modern low nm processes the costs for a reticle are in the specialized software and processing time to create the reticles. It is no longer a simple question of " I want an unexposed square form on my wafer so the reticle has a square black shape on it 4 times bigger than on the wafer". You need to take into account the UV laserlight which is absorbed by glass so you need special glass, phase shifts, lens deviations, abberations on the edge, reflections and I don't know what more. If you look at the finished reticle you don't recognize the original pattern but it is what you finally get on the wafer. There are lots and lots of raytracing and calculations needed, and ofcourse the accurate creation of the reticle, even 4 times bigger you still need 10's of nm accuracy on your pattern. IIRC it takes at least a month to create a complete reticle set. Just an example of a company: http://www.photronics.com/plab/phase-shift-masks-eapsm/ |
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