# NAND2 CMOS help

#### geft

Joined Dec 8, 2011
19
The question asks to find the threshold voltage for the case where two inputs switch simultaneously. What does this mean?

#### praondevou

Joined Jul 9, 2011
2,942
The question asks to find the threshold voltage for the case where two inputs switch simultaneously. What does this mean?
Please post the context, maybe the original question with a picture or formula or something.

#### geft

Joined Dec 8, 2011
19
Consider a CMOS NAND2 gate for the case where the two inputs switch simultaneously.
Assume $$k_p = k_n = 100 uA/V^2$$. Derive an expression for $$V_{th}$$.

It then notes that when both transistors are switching simultaneously, NMOSA is in saturation and NMOSB is in linear region.

What does "two inputs switch simultaneously" mean?

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#### MrChips

Joined Oct 2, 2009
23,090
What does "two inputs switch simultaneously" mean?
You cannot get much clearer than that. It means both inputs are changing at the same time.