This question compares two different ways to implement a four-input CMOS AND gate.
(a) A four-input AND gate can be constructed by three two-input CMOS AND gates. The outputs of two two-input AND gates are connected to the inputs of the third two-input AND gate. Draw the corresponding circuit diagram. How many transistors (both PMOS and NMOS) are required?
(b) Show how you can use only 2-input CMOS NAND and NOR gates to build the four-input AND gate. How many transistors (both PMOS and NMOS) are required? (Hint: Use DeMorgan's theorem.)
I have completed part A.
Im having trouble visualizing how I can do B
(a) A four-input AND gate can be constructed by three two-input CMOS AND gates. The outputs of two two-input AND gates are connected to the inputs of the third two-input AND gate. Draw the corresponding circuit diagram. How many transistors (both PMOS and NMOS) are required?
(b) Show how you can use only 2-input CMOS NAND and NOR gates to build the four-input AND gate. How many transistors (both PMOS and NMOS) are required? (Hint: Use DeMorgan's theorem.)
I have completed part A.
Im having trouble visualizing how I can do B