Discussion
Which one of the following is not an advantage of CMOS technology over NMOS ?
Answer: C
The one that is not an advantage is less number of fabrication steps.
CMOS needs both n-channel and p-channel transistors on the same chip, so it needs extra masks and steps to form the wells (n-well, p-well or twin-tub) in which one type sits. A CMOS process is therefore more complex than an NMOS process, not simpler.
The other three are genuine advantages of CMOS: almost no static power, which allows a high density of logic on a chip without overheating, and a rail-to-rail output swing that gives high noise immunity.
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