6.3.4. CMOS NOR Gate Truth Table

Try these first

1. 1.

   What is the output of a CMOS NOR gate when both inputs are low?

   Hint

   Think about when the PMOS transistors conduct.

2. 2.

   If one input of the NOR gate is high (1) and the other is low (0), what is the output?

   Hint

   Recall how NMOS transistors behave.

3. 3.

   What is the output of a CMOS NOR gate when both inputs are high?

   • 1
   • 0
   • Undefined

   Hint

   Consider the behavior when at least one input is high.

4. 4.

   True or False: A CMOS NOR gate can be used to construct any logic circuit.

   • True
   • False

   Hint

   Think about the capabilities of universal gates.

5. 5.

   If you were to create a circuit with three inputs A, B, and C using NOR gates only, what would be the logic function it implements when all inputs are supplied to a three-input NOR gate?

   Hint

   Think about how adding inputs changes the truth table.

6. 6.

   Design a circuit with multiple NOR gates that would output high when either input A or input B is true. Describe the interconnections needed.

   Hint

   Consider how inversion can establish the desired behavior.