CMOS Full Adder Quiz

A full adder has how many inputs and outputs?

• 2 inputs, 1 output

• 2 inputs, 2 outputs

• 3 inputs, 2 outputs

• 3 inputs, 3 outputs

Which of the following equations represents the sum output of a full adder?

• A ⊕ B

• A · B · Cin

• A ⊕ B ⊕ Cin

• A + B + Cin

Which Boolean expression represents the carry output of a full adder?

• A ⊕ B

• AB + BCin + ACin

• A + B + Cin

• A ⊕ B ⊕ Cin

Which logic design is commonly used in full adders for low power and delay?

• Dynamic logic

• CMOS transmission gate logic

• NMOS only

• Resistor-transistor logic

What is the minimum number of logic levels needed to implement a full adder in CMOS?

• 1

• 2

• 3

• 4

Which statement is true about a full adder in CMOS design?

• It uses only PMOS transistors

• It has static power consumption

• It can be implemented using XOR, AND, OR gates

• It always uses pass transistor logic

Which of the following is a disadvantage of using complementary static CMOS for full adder?

• High power

• High static current

• Large transistor count

• No logical completeness

A full adder designed using transmission gates benefits from:

• Fewer interconnects

• No need for clocking

• Reduced transistor count and high speed

• Use of only PMOS

In a complementary CMOS full adder, the sum logic usually involves:

• NOR gates

• XOR gates

• NAND gates

• AND gates

For high-speed addition in CMOS, which technique is often used?

• Ripple carry with inverters

• Carry select or carry look-ahead logic

• Resistive pull-up design

• Tri-state bus implementation