digital logic How to calculate Gate Delays in normal Adders and Carry Look Ahead Adders

  
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For a 4-bit Carry Look Ahead Adder have 3 gate delays for all carry bits and 4 gate delays for all sum bits, while it is stated as 7 and 8 in case of ripple adders. How, was this calculated The image of 4 bit carry look ahead adder is shown below:
digital logic How to calculate Gate Delays in normal Adders and Carry Look Ahead Adders - schematic




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