7.2.2. CMOS Logic Gate Design

Try these first

1. 1.

   What is a CMOS logic gate?

   Hint

   Think about how it involves two types of transistors.

2. 2.

   Name a basic CMOS logic gate.

   Hint

   Consider common logic operations.

3. 3.

   What logic function does a NAND gate perform?

   • AND
   • NAND
   • OR
   • XOR

   Hint

   Think about what happens when both inputs are high.

4. 4.

   The output of a NOR gate is high when:

   • True
   • False

   Hint

   Remember how NOR behaves opposite to OR.

5. 5.

   Design a CMOS circuit that performs a three-input NAND function. Describe the transistor configuration and draw the resulting circuit diagram.

   Hint

   Consider how many transistors you need in each type to achieve the desired functionality.

6. 6.

   Given the truth table for a CMOS gate, determine the logic function and justify your result by drawing the necessary transistor configuration.

   Hint

   Work backwards from the truth table to see what conditions lead to the outputs.