How many full adders are required to make an n-bit ripple carry adder?Question 4Answera.N-1b.2*Nc.N+1d.N
Question
How many full adders are required to make an n-bit ripple carry adder?
Question 4
Answer
- a. N - 1
- b. 2 * N
- c. N + 1
- d. N
Solution
The number of full adders required to make an n-bit ripple carry adder is N. So, the correct answer is d. N.
Here's why:
A ripple carry adder is a digital circuit that produces the arithmetic sum of two binary numbers. It is called a ripple carry adder because each carry bit "ripples" to the next full adder.
For an n-bit ripple carry adder, you need n full adders. Each full adder is responsible for adding a single bit from each of the two numbers, plus a carry bit from the previous full adder (if there is one).
For the first bit (the least significant bit), you don't need to add a carry bit because there is no previous bit. But for all the other bits (from the second bit to the nth bit), you need to add a carry bit from the previous full adder.
So, for an n-bit ripple carry adder, you need n full adders.
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