Four bit ripple carry adder with overflow

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In most cases, P is simply the sum output of a half adder and G is the carry output of the same adder. The carry-out represents bit one of the result, while four bit ripple carry adder with overflow sum represents bit zero. Each full adder inputs a C inwhich is the C out of the previous adder. Assumed that an XOR-gate takes 1 delays to complete, the delay imposed by the critical path of a full adder is equal to. Instead, three-input adders are used, generating two results:

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