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transistor size depends on its channel length, that is the length of the region in which a transistor act as an electron tube.

the shorter the region, the lowest the resistance, the fastest the transistor, etc...

so, it is always good to scale transistor size.

problem is that you have to apply a 'good' electrical field in the channel, in order to drive a good 'ON' or 'OFF' state for your transistor. that's why it's not easy to scale their size.

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