Which of the following(s) is(are) NOT a feature of short channel transistors?

Question

BlackTom AI · Accepted Answer

The question asks which options are NOT a feature of short channel transistors, and we need to evaluate each choice in that context.
Option 1: thin gate oxide. In short-channel devices, gate control over the channel becomes more critical to suppress leakage and maintain drive current, so employing a thin gate oxide is a common design choice to enhance electrostatic control. This is generally considered a feature of scaled, short-channel transistors.
Option 2: heavy substrate doping. Heavier substrate or body doping can help mitigate punch-through and improve threshold stability in short-channel devices by shaping the body potential and enhancing threshold control. While it comes with trade-offs like increased leakage in some cases, the concept of body/substrate engineering as a tool to manage short-channel behavior makes this a plausible, feature-like aspect.
Option 3: low source/drain resistance. In practice, one often aims to reduce source/drain resistance to maintain drive current, but short-channel transistors face challenges such as elevated parasitic capacitances and drain-induced barrier lowering that can complicate achieving low series resistance. Moreover, short-channel scaling frequently emphasizes minimizing junction capacitance and parasitics rather than achieving unusually low S/D resistance as a defining characteristic. This makes “low source/drain resistance” less of a defining feature and more of an engineering goal that may not be inherently characteristic of short-channel behavior.
Option 4: shallow source/drain junction. As transistors scale down, junctions are made shallower to reduce junction capacitance and improve performance, which is a hallmark of short-channel and deeply scaled devices. This is indeed a feature associated with short-channel transistors.
In summary, the features most typically linked to short-channel transistors are aspects like thin gate oxide, body/substrate engineering, and shallow S/D junctions to control leakage, capacitance, and threshold behavior. The notion of having inherently low source/drain resistance is not a defining feature and is not guaranteed by short-channel scaling; it is more of an operating or design goal that may be limited by other parasitics in scaled devices.

EESM5200 (L2) Part II: Topic 10 - Short-channel MOSFET

Which of the following(s) is(are) NOT a feature of short channel transistors?

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