Chapter: Digital Electronics : Combinational Circuits

BCD Adder

When the sum of two digits is less than or equal to 9 then the ordinary 4-bit adder can be used

BCD ADDER:

^§When the sum of two digits is less than or equal to 9 then the ordinary 4-bit adder can be used

^§But if the sum of two digits is greater than 9 then a correction must be added “I.e adding 0110”

^§We need to design a circuit that is capable of doing the correct addition

^§The cases where the sum of two 4-bit numbers is greater than 9 are in the following table:

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Digital Electronics : Combinational Circuits : BCD Adder |