Adder Circuits
Adder Circuits
Adder Circuits
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<strong>Adder</strong>.PPT(10/1/2009) 5.14Standard N-bit <strong>Adder</strong>Delay of standard N-bit adder = 2N+1P0Q0C–1PQCISCP1 P2 S0 P S1 P S2Q1 S Q2 SQQC0 C1 C2CI CCI CP3Q3PQCISCS3S4P0C0 C0 C1 C1 C2 C2 S32 2 2 3Delay of carry path within each full adder = 2Carry path consists of three 2-input + one 3-input NANDs
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