Question

Why nmos us preferred for pull down network and pmos for pull up network?

Answer 1

The two networks in the active pullup circuit must be be designed so that they are never both conducting or are both open at the same time (recall the definition of complementary MOS). This is the reason that nMOS transistors are used in the pull-down network and pMOS in the pull-up network of a CMOS gate.

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