Carry-ripple adder for addition of bits of similar value has 3 inputs for input bits to be summated, carry inputs for carry bits, output for calculated sum bit and carry outputs for carry bits

摘要

The carry-ripple adder (10) has 3 inputs (I0,I1,I2) for reception of 3 input bits of similar value, 2 further carry inputs (CI1,CI2) for reception of carry bits of similar value, an output (S) for delivery of a calculated sum bit and 2 ouputs (CO1,CO2 for delivery of carry bits with a higher value than the calculated sum bit. A pre-charge input may be provided for controlling an integrated pre-charge logic stage.