Full Subtractor Half Subtractor. This circuit has three inputs a b and b in. The half subtractor is a combinational circuit which is used to perform subtraction of two bits.
There are two types of subtractors. It has two inputs x minuend and y subtrahend and two outputs d difference and b borrow. Full subtractor also belongs to the class of a combinational circuit and is used to perform subtraction of two binary bits.
B in is the borrow in bit from the previous stage.
The half subtractor is a combinational circuit which is used to perform subtraction of two bits. B in is the borrow in bit from the previous stage. The difference output of first half subtractor is ex or of a and b. The full subtractor can be implemented with two half subtractors by cascading them.
