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Consider the following statements for a metal oxide semiconductor field effect transistor (MOSFET):
P: As channel length reduces, OFF-state current increases.
Q: As channel length reduces, output resistance increases.
R: As channel length reduces, threshold voltage remains constant.
S: As channel length reduces, ON current increases.
Which of the above statements are INCORRECT?
- P and Q
- P and S
- Q and R
- R and S
Correct answer: Q and R
Solution
Statements Q and R are incorrect because as the channel length of a MOSFET decreases, the output resistance typically decreases due to increased short-channel effects, and the threshold voltage often changes rather than remaining constant.
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