6.5.1. Propagation Delay

Try these first

1. 1.

   What is propagation delay?

   Hint

   Think about timing in a circuit.

2. 2.

   Name one factor that affects propagation delay.

   Hint

   Consider the elements involved in signal propagation.

3. 3.

   What is propagation delay?

   • The speed of a CPU
   • Time for input change to affect output
   • A type of error in circuits

   Hint

   Think about the effect of input changes in logic gates.

4. 4.

   True or False: Increasing parasitic resistance generally decreases propagation delay.

   • True
   • False

   Hint

   Consider how resistance behaves in an electrical context.

5. 5.

   A digital circuit experiences a significant propagation delay due to high capacitance. Discuss four methods you could apply to reduce this delay.

   Hint

   Think about ways to adjust the physical design of the circuit.

6. 6.

   If a CMOS gate has a propagation delay of 5 ns with certain capacitance and resistance values, and you double the transistor size, explain the expected effect on propagation delay.

   Hint

   Consider the effects of size on capacitance.