In a static CMOS gate which of the following are true: i.Pull up section is a du
ID: 3871456 • Letter: I
Question
In a static CMOS gate which of the following are true:
i.Pull up section is a dual of pull down section
ii.Each input drives one PMOS and one NMOS transistor
iii.It is a full-restored logic
iv.None of the above
2)Sketch the transistor-level schematic of a CMOS 3-input XOR gate. Assume only true versions of the inputs are available. How many transistors do you need to implement the gate? Note: You should implement the gate as a compound gate. In other words, you cannot use individual NAND or NOR gates.
Explanation / Answer
1)
i- pull up section can be implemented by dual of pull down section
ii- each input drives one pmos and one nmos, hence it is true
iii-cmos are full restored logic because -----------the pMOS transistors passes ----->1’s
while nMOS passes-------> 0’s,hence outputs are always strongly driven and no degradation of levels