Full Adder Subtractor Circuit Diagram. This circuit has three inputs and two outputs. So we add the y input and the output of the half adder to an exor gate.
The circuit diagram of full adder is shown in the following figure. Where a and b are called minuend and subtrahend bits. A full subtractor fs is a combinational circuit that performs a subtraction between two bits taking into account borrow of the lower significant stage.
This adder is called as full adder because for implementing one full adder we require two half adders and one or gate.
The circuit diagram of the full subtractor using basic gates is shown in the following block diagram this circuit can be done with two half subtractor circuits. Full adder using half adder. The circuit diagram of full adder is shown in the following figure. So we add the y input and the output of the half adder to an exor gate.
