Design Issues : The corresponding boolean expressions are given here to construct a carry lookahead adder. In the carry-lookahead circuit we ned to generate the two signals carry propagator(P) and carry generator(G), Pi = Ai  Bi Gi = Ai · Bi The output sum and carry can be expressed as Sumi = Pi  Ci Ci+1 = Gi + ( Pi · Ci) Having these we could design the circuit. We can now write the Boolean function for the carry output of each stage and substitute for each Ci its value from the previous equations: C1 = G + P0 · C0 C2 = G1 + P1 · C1 = G1 + P1 · G0 + P1 · P0 · C0 C3 = G2 + P2 · C2 = G2 P2 · G1 + P2 · P1 · G0 + P2 · P1 · P0 · C0 C4 = G3 + P3 · C3 = G3 P3 · G2 P3 · P2 · G1 + P3 · P2 · P1 · G0 + P3 · P2 · P1 · P0 · C0

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