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Four different types of Adders are used to construct an 8-bit adder. The characteristic of each full adder in terms of delay is as follows:



The structure of the FA is as follows:





The maximum no of addition per second that the above adder can perform is –

  • a)
    3.23 x 106

  • b)
    5 x 106

  • c)
    5.23 x 106

  • d)
    5.95 x 106

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Four different types of Adders are used to construct an 8-bit adder. T...
It is not clear what "above adder" is referring to in the question, as there is no specific adder mentioned. Therefore, it is not possible to determine the maximum number of additions per second that the adder can perform without more information.
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Community Answer
Four different types of Adders are used to construct an 8-bit adder. T...
The carry generation timings are as follows:
T(C1) = 18 nsec
T(C2) = (18 + 27) nsec = 45 nsec
T(C3) = (23 + 45) nsec = 68 nsec
T(C4) = (32 + 68) nsec = 100 nsec
T(C5) = (18 + 100) nsec = 118 nsec
T(C6) = (23 + 118) nsec = 141 nsec
T(C7) = (27+141) nsec = 168 nsec
Cout = (32 + 168) nsec = 200 nsec
To find the maximum no of addition we have to find the time taken for each addition
Now, sum generation times are as follows:
T(S8) = (168 + 23) nsec = 191 nsec
T(S7) = (141 + 169) nsec = 310 nsec
T(S6) = (118 + 72) nsec = 190 nsec
We see that S7 appears at t = 310 nsec while the last carry Cout appears before at t = 200 nsec. 
As, S7 takes the longest time to generate the output. 
Thus, the maximum number of addition per second 
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Four different types of Adders are used to construct an 8-bit adder. The characteristic of each full adder in terms of delay is as follows:The structure of the FA is as follows:The maximum no of addition per second that the above adder can perform is –a)3.23 x 106b)5 x 106c)5.23 x 106d)5.95 x 106Correct answer is option 'A'. Can you explain this answer?
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