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Why does testbook shows more inputsm bad driven output?

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Kun77

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Hi , I am new to VLSI. The textbook shows that "more inputs, bad driven output".
Why does the driven strength of output go low, when logic gates has more inputs?
 

Without giving the context, the question is completely unclear. It might refer to an unbuffered gate where the series connection of transistors increases the output voltage drop, like in the below NAND4

1669457449967.png
 

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