Question

The difference between the minimum output voltage during logic high and the minimum input level during logic high of a logic family is referred to as ________.

• A. acceptable logic high output voltage range
• B. acceptable logic high input voltage range
• C. noise margin at logic high
• D. operating voltage range

Hint:

Greater noise margin ⇒ better immunity against unwanted voltage fluctuations.

Answer 1

The Correct Option is C

Noise Margin:

Logic High Output (V_OH) is the minimum voltage at which output is considered logic 1.
Logic High Input (V_IH) is the minimum input voltage interpreted as logic 1.
Noise Margin High = \( V_{OH} - V_{IH} \)

This difference ensures that small noise signals added to output do not flip the logic at the next stage.