Parallel Binary Subtractor. For an n bit parallel subtractor we cascade n full subtractors to achieve the desired output. To do so full adders or full subtractors are cascaded with one another.
A digital circuit that is used to calculate the arithmetic difference between two binary pairs of bits is known as a parallel subtractor. The minuend subtrahend and a borrow in from the previous bit order position. Parallel adder subtractor using a single circuit can be also designed using a mod bit m where mod bit m decides whether the circuit will act as an adder or a subtractor.
As shown in the figure the parallel binary subtractor is formed by combination of all full adders with subtrahend.
Firstly the 1 s complement of b is obtained by the not. The binary subtraction process is summarized below. A digital circuit that is used to calculate the arithmetic difference between two binary pairs of bits is known as a parallel subtractor. The minuend subtrahend and a borrow in from the previous bit order position.
