Full Subtractor Block Diagram. Full subtractor circuit construction is shown in the above block diagram where two half subtractor circuits created full subtractor. Whereas in its design actually we can make a borrow bit in the circuit can subtract with the remaining two i ps.
Fugure below shows the block diagram of the full subtractor. In the above circuit there are two half adder circuits that are combined using the or gate. As we know that the half subtractor produces two outputs i e diff and borrow.
The foremost disadvantage of the half subtractor is we cannot make a borrow bit in this subtractor.
A full subtractor fs is a combinational circuit that performs a subtraction between two bits taking into account borrow of the lower significant stage. Full subtractor circuit construction is shown in the above block diagram where two half subtractor circuits created full subtractor. The first half subtractor has two single bit binary inputs a and b. As we know that the half subtractor produces two outputs i e diff and borrow.
