6.4. CMOS XOR and XNOR Gates

Try these first

1. 1.

   What output does an XOR gate produce when both inputs are 0?

   Hint

   Check the truth table of the XOR gate.

2. 2.

   If XNOR gate inputs are (1, 1), what is the output?

   Hint

   Consider the condition for XNOR being true.

3. 3.

   What does the output of the XOR gate signify when both inputs are high?

   • 1
   • 0
   • undefined

   Hint

   Recall the XOR truth table.

4. 4.

   True or False: The XNOR gate outputs high when inputs differ.

   • True
   • False

   Hint

   Think about what XNOR actually checks.

5. 5.

   Design a CMOS circuit that incorporates both XOR and XNOR gates to implement a two-bit comparator.

   Hint

   Think about the relationships between the bits to determine equality and inequality.

6. 6.

   Explain how you would modify a standard XOR circuit to handle more than two inputs.

   Hint

   Focus on how binary addition could be extended across multiple bits.