Based on the resistive adder circuit device

The invention relates to the technical field of semiconductor integrated circuits, and discloses an adder circuit based on a variable resistance device. According to the invention, the adder circuit is constructed by utilizing a variable resistance device which is provided with a plurality of resistance states, extra circuits caused by carry signals are reduced, the actual area and time delay of the circuit are reduced, and the circuit cost is lowered; additionally a subtraction operation can be realized simultaneously through simple circuit alteration, and the adder circuit has a higher practical effect; and the adder circuit with favorable performances is obtained, and the application field of the variable resistance device is expanded.