Electronic – How to find gate delay for 4-bit look-ahead carry adder

addercarry-look-ahead

How can I find Gate Delay for bit 1 of the sum by a 4-bit look-ahead carry adder?

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Best Answer

You want to take the internal logic for a 4-bit adder with look-ahead carry, such as the 74HC283:

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and then count up the longest possible gate delay for S2, or bit 1 (I get 6).

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