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Basic elements of combinational logic
Published in J. R. Gibson, Electronic Logic Circuits, 2013
This gate is equivalent to an OR gate followed by an inverter; i.e. the NOR function is NOT–OR. The NOR gate has an output of 0 unless all the inputs are 0, in which case the output is 1. The behaviour of a two-input NOR gate is given in Table 2.9. In Boolean algebra this is written as R=A+B¯ which is R equals not the result of A or B, or alternatively, R equals NOR of A with B.
Semiconductors and Digital Logic
Published in Syed R. Rizvi, Microcontroller Programming, 2016
The NOR gate is the opposite of the digital OR gate and behaves in a manner that corresponds to the opposite of the OR gate. A logical 1 output results if both the inputs to the gate are 0. If one or more inputs are 1, the result is a 0 output. NOR is the result of the negation of the OR operator. The NOR gate, like the NAND gate, is a useful logic element because it can be used as a universal gate. NOR is a functionally complete operation such that combinations of NOR gates can be combined to generate any other logical function.
Very-Large-Scale Integration Technology: History and Features
Published in A. Arockia Bazil Raj, FPGA-Based Embedded System Developer's Guide, 2018
In a two-input NOR gate, the pull-up subcircuit is made of a series combination of two pMOS transistors. These are responsible for conducting logic 1 to the output node when both of the gates are at logic 0. The pull-down path, on the other hand, consists of a parallel combination of two nMOS transistors. If either of the inputs is at logic 1, the output node gets the logic value 0. For a two-input NOR gate, the Boolean expression is (A+B)′ = A′B′.
A Novel Co-Planar Five Input Majority Gate Design in Quantum-Dot Cellular Automata
Published in IETE Technical Review, 2022
Animesh Srivastava, Rajeevan Chandel
For digital circuit realization, the NOR and NAND gates are considered to be the universal gates and are extensively used. Along with these gates, exclusive-OR (XOR) gate is also used. In past, various XOR gate models [64–71], have been proposed. To showcase the practical use of the proposed MAJ5 model, we present a novel XOR gate design in this section. For two inputs A and B, the output Out, realized by the XOR gate is shown in (20), respectively. Figure 18 shows the realized XOR gate model designed using the proposed 5-input majority gate. The simulation results of the exclusive-OR gate is shown in Figure 19, respectively. From the output results, we can visualize that the present model successfully satisfies (20).
New MGDI-based full adder cells for energy-efficient applications
Published in International Journal of Electronics, 2021
Majid Amini-Valashani, Sattar Mirzakuchaki
As illustrated in Figure 1, one can easily recognise that full adder cells in gate level can be implemented by means of two basic gates, i.e. XOR (or XOR-XNOR) and NOR. Also it is worth mentioning that in Static-CMOS topology utilising NOR gates in transistor level yields less area and lower power consumption than utilising OR gates.
Reflective semiconductor optical amplifiers-based all-optical NOR and XNOR logic gates at 120 Gb/s
Published in Journal of Modern Optics, 2020
The NOR logic gate is a logically inverted OR gate that gives ‘1’ output only when both inputs are ‘0’. The schematic diagram and the corresponding truth table of the NOR logic gate using a dual-RSOAs-based scheme are illustrated in Figure 2.