Extra exam question E6C06
Subelement E6, CIRCUIT COMPONENTS· Group E6C
Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
- A.Large bypass capacitance is inherent
- B.The input switching threshold is about twice the power supply voltage
- C.The input switching threshold is about half the power supply voltage (correct answer)
- D.Bandwidth is very limited
WhyCMOS digital integrated circuits have high noise immunity because their input switching threshold is about half the power supply voltage. CMOS digital ICs have high noise immunity because their input switching threshold sits at roughly half the power supply voltage, giving noise on the input or supply line a wide margin before it could accidentally cross that threshold and flip a gate's state, answer C. It isn't inherent bypass capacitance, isn't a threshold at twice the supply voltage (which isn't physically meaningful for a logic input), and it isn't limited bandwidth that provides this noise immunity.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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