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by mateja 1175 days ago
CMOS and DRAM are completely different processes and cannot be integrated on the same wafer. This has been tried many times unsuccessfully. This is why you see highly integrated packaging solutions like chiplets. These solutions integrate CMOS and DRAM in the same package, not on the same die.
2 comments

Thanks, this is what I'd love to understand better.

At the highest level isn't it all EUV? Why can't the laser print both patterns onto the wafer?

A CMOS chip doesn't contain any capacitors. DRAM is made of capacitors, and thus has a radically different structure.
Chiplets are also used for that, sure (stuff like radios are occasionally separate chiplet made in different process), but I think main push is smaller chips = higher yields