Question

What is the purpose of using CMOS over gates? Provide reasoning for your answer.

Answer 1

Ans- CMOS gate(Complementary metal -oxide semiconductor ) is pMos pull -up network connected to the output 1 and nMos pull -down network connected to the output 0. this gate is depicted below . they are connecting pull-up and pull-down of output. there are two types of CMOS.

• High noise immunity.
• low static .

These characteristics allow CMOS to integrate a high density of logic function on a chip .it was this reason to implemented in VLSI chips.

The Purpose of CMOS-

• virtually , no DC power consumed.
• NO DC path between power and ground .
• Excellent noise margins (Vol=0,VoH=VDD).
• Inverter has sharp transfer curve ..
• High gain and current drive .
• High speed .
• Mechanically robust.
• Very low static power dissipation.
• High noise margin.