arithmatic Circuits I - Arithmetic Circuits Binary Full...

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Arithmetic Circuits
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Binary Full Adder A B C i S C o Carry Status 00000 delete 00110 delete 01010 propagate 01101 propagate 10010 propagate 10101 Gene/propa 11001 Gene/propa 11111 Gene/propa
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S = A EXOR B EXOR C i C o = AB + BC + C i A C 0 = AB + BC i + AC i S = ABC i + C 0 (A+B+C i )
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NMOS and PMOS transistors connected to Ci are placed close to output of the gate. - transistors on the critical path should be placed as close as possible to the output of the gate. - For instance in stage k of the adder, signals Ak and Bk are available and stable long before Ci,k(=Co,k-1) arrives rippling through previous stages. Thus capacitances of the in the transistor chain are precharged or discharged in advance. On arrival of Ci,k the capacitance at node X has to be (dis)charged Putting Ci,k transistors close to GND and VDD would require not only (dis)charging of the capacitances of node X but also internal capacitances.
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Inverting all inputs to a full adder results in inverted values for outputs.
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arithmatic Circuits I - Arithmetic Circuits Binary Full...

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