Q. Compare and contrast Ripple-Carry Adder and Carry-Look ahead Adder
In a 4-bit ripple-carry adder as shown in Figure , assume that each full-adder is implemented using the design as shown in Figure (a) and each single logic gate (e.g., AND, OR, XOR, etc.) has a propagation delay of 10 ns.
What is the earliest time this 4-bit ripple-carry adder can be sure of having a valid summation output? Explain how you reached your answer and how you did your calculations.