6.4.4. CMOS XNOR Gate Truth Table

Try these first

1. 1.

   What is the output of an XNOR gate when both inputs are 1?

   Hint

   Think about when the inputs match.

2. 2.

   List the two combinations of inputs that output a 1 in an XNOR gate.

   Hint

   Remember: it outputs high when both inputs are the same.

3. 3.

   What is the output of a CMOS XNOR gate with inputs 0 and 1?

   • 1
   • 0
   • Undefined

   Hint

   Recall the definition of XNOR.

4. 4.

   True or False: The XNOR gate outputs true only when both inputs are different.

   • True
   • False

   Hint

   Think about the gate's behavior.

5. 5.

   Create a diagram of a circuit that uses several XNOR gates to check two bits and provide a parity output. Indicate all inputs and outputs clearly.

   Hint

   Think about how outputs could cascade through logic gates.

6. 6.

   Given a sequence of bits, apply an XNOR operation to them step-by-step to find if there’s an even or odd parity.

   Hint

   Use a systematic approach to keep track of the current parity state.