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Reverse-engineering a carry-lookahead adder in the Pentium
Addition is harder than you'd expect, at least for a computer. Computers use multiple types of adder circuits with different tradeoffs of si...
I removed the metal layers, so this photo shows the doped silicon (dark) and the polysilicon (faint gray). The circuit in the upper left is repeated 8 times to produce the propagate, generate, and partial sum for each bit. Underneath the metal, polysilicon wiring and doped silicon regions are barely visible; they form the transistors.
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