CARRY PROPAGATE ADDER. AMIT HINGHER Computational Engineering. Basic Principle of a CPA. Adds two n-bit operands A = (a n-1 ..a 0 ), B=(b n-1 ..b 0 ) and an optional carry-in c in by performing carry propagation
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a) Linear Structureb)Tree Structure
= Σn-1i=0 2iai+ Σn-1i=0 2ibi+ cin
= Σn-1i=0 2i (ai + bi) + cin
where c0 = cin and cout = cn
where c0 = cin & cout =cn
* A four operand adder circuit