Advantages of cmos

cmos is preferred over nmos or pmos, because of

• we can save the power if we are using cmos that is power consumption is low
• cmos is preffered because we can reduce the complexity of the circuit and also much power is saved
• manufacturing cmos is difficult when compared to nmos and pmos because cmos includes both nmos and pmos,where as nmos and pmos has uniform structure and hence easy to manufacture.
• cmos is preferred over nmos, as cmos propagates both logic'1' and logic'0' with out a voltage drop.
• when using nmos only, logic '1' i.e Vdd suffers a threshold drop and the output after passing through one nmos gate would be Vdd-Vt
• hence signal margin is very important in nmos causing possible signal integrity issues

**cmos, nmos, pmos are all low powered. static power consumption is the same and Dynamic power consumption depends on the signal swing (i.e number of times data line varies)


Advantages of cmos

• high noise margin
• high packing density
• scalable Vt
• bidirectional
• minimum power dissipation
• fully restored logic levels
• high input impedance
  
• low power dissipation