A study of high density multilayer LSI

Describes a new type of high density multilayer LSI chip which is made up of several piled chips. Prescribed interconnections on the conventional wafer, are fabricated first. Thin chips with through-holes (about the size of pad) are fixed to the available parts of the under-layer chip. Each chip is interconnected through the holes. As a result, the chips will be equivalent to a hybrid IC which has several chips. This model is equal to the large scale high density LSI, the multichip substrate system, and hybrid WSI (Wafer Scale Integration).<
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