Approximately what technology node the physical gate length became larger than the number given in the technology node?

[Fill in the blank]
nm

Question

Approximately what technology node the physical gate length became larger than the number given in the technology node?
 
[Fill in the blank]
 nm

BlackTom AI · Accepted Answer

This is a fill-in-the-blank question asking for the approximate technology node where the physical gate length ended up exceeding the nominal node value.

First, recall what the technology node represents: it is largely a marketing and historical term that roughly correlates to feature sizes but does not map directly to an exact physical gate length. In earlier generations, as manufacturing techniques advanced, the advertised node often referred to a guess of overall lithographic capability rather than a precise gate length.

Next, consider the trend: as process nodes shrink from, say, 28 nm down to sub-20 nm ranges, the minimum practical transistor gate length does not reduce linearly with the node name. Process variations, device architecture (such as FinFET implementations), and the desire to maintain performance and reliability lead to actual gate lengths that are not exactly equal to the node label. In many discussions of industry trends, there is an observation that around the 16 nm node, the actual physical gate length tends to exceed the nominal node value due to these definitional shifts and lithographic realities.

Therefore, when filling the blank about the approximate node where the physical gate length becomes larger than the nominal node number, the commonly cited reference point is around 16 nm. This reflects the broader notion that the node name diverges from the true physical dimensions as you move through the more aggressively scaled generations.

If you were comparing different node generations, you would look for the point at which publication notes start to emphasize that the measured minimum gate length or critical dimension is larger than the advertised node label, which is a hallmark of the non-linear mapping between node names and physical dimensions in modern CMOS technology.

EESM5200 (L2) Part II: Topic 9 - Transistor Scaling

Approximately what technology node the physical gate length became larger than the number given in the technology node? [Fill in the blank] nm

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