Advanced transistors (FinFET and GAA)

How is the effective channel width of a FinFET adjusted?

  1. ABy changing the number of fins, so the width takes discrete values
  2. BBy changing the gate voltage
  3. CIt can be set to any continuous value, as in planar transistors
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Answer: A. By changing the number of fins, so the width takes discrete values

In a FinFET, the fin height and width are fixed by the process, so the channel width is adjusted by the number of fins. The width therefore takes discrete values (multiples of one fin), and the inability to set it freely as in planar transistors is a constraint on circuit design.

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More Advanced transistors (FinFET and GAA) questions

  1. Which correctly describes the CFET (complementary FET), researched as the structure to follow GAA?
  2. In high-k/metal gate transistors, which is one of the main ways to adjust the threshold voltage?
  3. Which correctly describes the gate-last (replacement metal gate) process?
  4. What is an advantage of fully depleted SOI (FD-SOI) transistors?
  5. In very small transistors, what is the phenomenon called in which the threshold voltage varies because of statistical variation in the number and positions of dopant atoms in the channel?