![]() ![]() The results show that the new XOR/XNOR gates consistently consume less power than any other XOR/XNOR gate known at the time of publication. Simulations have been performed on the circuits along with 10 other XOR gates. ![]() This paper proposes a new set of low power 4-transistor XOR/XNOR gates. All the current is again blocked by the transistor and we get low voltage at the output, which turns OFF the LED.įig. Exclusive-OR and exclusive-NOR gates are important in digital circuits. The base to emitter junction and base to collector junction of both the transistors have a voltage lower than the threshold voltage and again they reach their cutoff state. As the second transistor is still in its cutoff state, the emitter of the first transistor is disconnected. In next case when we press switch 1 then the base of the first transistor gets a positive value of voltage but its emitter is connected to another transistor collector. Hence at the output, we get a low voltage which turns off the LED. Since all the current coming from the collector through resistor R3 blocks by the transistor. Therefore, the transistors act like an open switch. The base to emitter junction and base to collector junction of both the transistors have a voltage lower than 0.65V, which is the practical threshold voltage of the diode.īoth junctions are in reverse bias hence both the transistors turn off and go into their cutoff state. In NMOS technology, if one needs an XOR gate and the inputs come from logic that isn't driving anything else, one could get by with two transistors and one passive pull-up: simply connect the drains of the two transistors to the pull-up, connect A to the source of one and gate of the other, and B to the remaining source and drain. Initially, both the switches are in OFF state so none of the transistor bases get a power supply. QCA is a dynamic computational transistor paradigm that addresses device density, power. The base of both the transistors act like inputs and one of the emitter of either of the transistors is used to derive the output. Download scientific diagram Schematic of 4-input 'XOR' gate. You can find circuits using 4, 6, 8, 9, 10 or 12 transistors, again with varied strengths for the inputs and the output. Cite Context in source publication Context 1. The transistors are connected in series and their bases are used as input. The XOR gate has a much wider range of implementations in MOS and CMOS. In this paper, various transistor-level designs of XOR gates are analyzed based on transistor count, speed, power consumption. ![]()
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