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| Chip making process |
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| ZeroResistance:
--- Quote from: Kjelt on October 15, 2018, 07:40:43 pm --- The reticles (need two per layer) you need at least 20 depending on the nr of layers, are for the lower layers around $100k/piece upto $300k/piece for state of the art tech. --- End quote --- So what is the terminology is a reticle = a mask? |
| ZeroResistance:
--- Quote from: brucehoult on October 16, 2018, 05:06:52 am ---It means if your chip (including pads, and I expect a mandatory added unused boundary ring) is smaller than 4 mm^2 then you'll be charge for 4 mm^2 anyway. (EUR 1200) --- End quote --- So If my chip fits in 1mm2 and I'm opting for an unpackaged chip would they still charge me for 4mm^2 per chip and that would mean 4 * 300 Eur = Eur 1200 per chip. and then they require at least 20 samples to be taken so that would be 20 * 1200 = Eur 24000 for an order. Doesn't the price range sound too heavy for a university or a research setting? |
| brucehoult:
--- Quote from: ZeroResistance on October 16, 2018, 05:16:55 am --- --- Quote from: brucehoult on October 16, 2018, 05:06:52 am ---It means if your chip (including pads, and I expect a mandatory added unused boundary ring) is smaller than 4 mm^2 then you'll be charge for 4 mm^2 anyway. (EUR 1200) --- End quote --- So If my chip fits in 1mm2 and I'm opting for an unpackaged chip would they still charge me for 4mm^2 per chip and that would mean 4 * 300 Eur = Eur 1200 per chip. and then they require at least 20 samples to be taken so that would be 20 * 1200 = Eur 24000 for an order. Doesn't the price range sound too heavy for a university or a research setting? --- End quote --- Packaged or unpackaged is irrelevant to this price. This is, essentially, for your share of making the masks, which is once for all 20 or 40 or 100 chips (depending on the size of the wafers). Plus there's a little bit in there for paying for your part of the wafer and the processing costs, but that's tiny compared to the masks. So it's EUR 1200, not 20 * 1200. |
| brucehoult:
--- Quote from: ZeroResistance on October 16, 2018, 05:11:33 am --- --- Quote from: Kjelt on October 15, 2018, 07:40:43 pm --- The reticles (need two per layer) you need at least 20 depending on the nr of layers, are for the lower layers around $100k/piece upto $300k/piece for state of the art tech. --- End quote --- So what is the terminology is a reticle = a mask? --- End quote --- Normal terminology, as I understand it, is that a "reticule" is a small square(ish) area that is the maximum size you can make one individual chip. That's how big the masks are. Let's say, for example, that it's 25mm x 25mm or 625 mm^2. Your 1mm x 1mm chip gets put somewhere in this area, and the rest is taken up with other people's chips. Identical reticules are laid out in a grid covering the whole circular silicon wafer. For a 300mm wafer that's about 100 copies. So you end up with 100 chips. On a 200mm wafer it will be about 40 copies of the reticule (if it's 25mm x 25mm there too). |
| Kjelt:
--- Quote from: ZeroResistance on October 16, 2018, 05:11:33 am ---So what is the terminology is a reticle = a mask? --- End quote --- Yes it is. |
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