Relative speed of ripple carry adders


Question:

Relative Speed of Ripple Carry Adders

Calculate the relative speed of a 64-bit adder using ripple carry only, a ripple carry of 4-bit groups that use carry lookahead, and a ripple carry of 16-bit groups that use carry lookahead. Use the simulator located at the following url:
https://www.ecs.umass.edu/ece/koren/arith/simulator/

Also explain, what is relative speed and how is it calculated?

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