Polar Logic XOR/XNOR Circuits Using a Single Current Conveyor

The paper reports simple yet effective circuits for realizing XOR and XNOR logic operations with polarity, each employing a single current conveyor. The proposed polar logic circuits require four MOS switches and two resistors, besides a single CCII+ (second generation current conveyor), in each case. The new proposed circuits are simulated using 0.18 mu m CMOS process parameters with a +/- 1.8 V supply voltage and reference DC voltage of 1 V, thus enabling polar logic outputs. The polar output for logic 0 and 1 is in form of - 1 V and + 1 V respectively. The results included in support of the work are promising for future applications of the proposal in design of communication circuits. To facilitate better integration prospects, the proposed circuits are further simplified by removing one of the two used resistors and replacing CCII by CCCII (current controlled current conveyor). The simplified polar XOR gate is also verified through simulations. System design applications are expected to evolve from proposed work. The new proposed circuits are expected to significantly contribute to the advancement of circuit design.