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CLA and RCA delays.

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Ripple carry adder

Tpd for carry generation=n*tpdcarry

Tpd for sum = (n-1)*tpdcarry+ tpd(exor)

tpdcarry=tpd(and)+tpd (or)gate

Carry look ahead adder

Tpd for sum require 4level

= Tpd(external ( xor)+tpd(and)+tpd(or)+tpd(external exor)
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