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45nm technology refers to size of the transistors in a chip. A technology node is defined as the ground rules of a process

governed by the smallest feature printed in a repetitive array.

The half-pitch of first-level interconnect dense lines is most

representative of the DRAM technology level required for the

smallest economical chip size . This is currently chosen

as the dimension that defines a technology node. It is, however,

anticipated that in the future, the half-pitch dimensions of either

metal or polysilicon interconnections of microprocessors

(MPUs) and ASIC devices may rival or even become smaller than

the corresponding half-pitch of DRAM. The half-pitch dimension

however, may not represent the smaller feature of the chip.

For instance, for logic devices, such as MPUs, physical bottom

gate length represents the smallest feature. Nevertheless, the

technology node definition remains tight to the half-pitch indicator

as defined above. see this ref. for more http://ieeexplore.ieee.org/iel5/101/21453/00994854.pdf?arnumber=994854

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