"A 480-MHz RISC Microprocessor in a 0.12-micron Leff CMOS Tecnhology with Copper Interconnects", C.Akrout et.al. (IBM)

See

IEEE Journal of Solid-State Circuits, November 1998

A 480-Mhz RISC microprocessor with copper interconnect.

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Scanning electron microscope of six copper metal levels and local interconnect.

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Histogram of path delays with Cu interconnects.

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histogram of the clock tree latency with Al and Cu interconnects.

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