COMPARATIVE ANALYSIS OF FOUR-BIT BINARY ADDERS WITH PARALLEL CARRIES

Abstract

Recently, non-traditional adders have appeared, such as adders with a conditional sum and with conditional transfers, adders on three input or two-input fans «exclusive OR (XOR)». The paper considers the construction of functional circuits of four-bit binary adders, where bit adders are built on the basis of two and three «exclusive OR (XOR)» input gates and on adders with a conditional sum such as with parallel transfer circuits. The synthesis of an adder with a conditional sum is considered. In conclusion, four-digit adders are compared in terms of the number of MOSFETs and speed, which allows you to choose the type of adders when designing various digital devices that contain binary adders.