Glucose produced as the output signal from the andor subunits was applied as the input signal for the. A reversible circuit has the facility to generate a unique output vector from each input vector, and vice versa. Anne bracy cs 3410 computer science cornell university the slides are the product of many rounds of teaching cs 3410 by professors weatherspoon, bala, bracy, and sirer. A 3input and 3output reversible logic gate was proposed in 1. Reversible gates some of the important reversible logic gates are. Pdf implementation of reversible logic gate in quantum. Keywordsreversible logic, adiabatic circuits, toffoli gate, synthesis. A reversible function is, of course, a permutation and can be expressed as a set of disjoint cycles as done in 18, but we do not follow that approach here. Index terms reversible logic, reversible gate, power dissipation, flipflop, garbage i. It has wide applications in low power cmos and optical information processing, dna computing, quantum computation and nan. Bcd digit adder is the basic unit of the more precise decimal computer arithmetic. The reversible logic circuits must use a minimum logic depth or gate levels iv.
In reversible gates, there is onetoone mapping between input and output, causing no loss of information. Our logic gates, named reversible fluxon logic rfl, use. Reversible logic circuits made of dna journal of the. In this paper various logic gates and its applicability on logic design have been. Indepth comparative analysis of reversible gates for designing.
Reversible logic fundamentals reversible gates basic regular reversible structures mirror circuits and spies. This paper describes a new reversible logic gate named pr gate and peres gate has been proposed for low power. A transformation based algorithm for reversible logic. Request pdf reversible logic synthesis by quantum rotation gates a rotationbased synthesis framework for reversible logic is proposed.
Introduction in digital design, there are many logic gates being used in large numbers. With littlebits logic modules, you can program in block form. This paper represents a new reversible logic bbcdc and also a more effective realization of bcd adder by using the proposed reversible logic. Design of alu using reversible gates and vectored logic 4 b vectored mux. The circuits continuously recompute their outputs, allowing them to respond to changing inputs.
Reversible logic, power dissipation, reversible gates, quantum cost, cmos. Introduction energy loss is an important consideration in digital. Reversible logic circuits have been histor ically motivated by theoretical research in lowpower, and recently attracted interest as components of the. A study of reversible logic gates and their applications. The reversible logic circuits must use minimum number of constant inputs. Design and implementation 16 bit reversible logic alu with. Design of low power arithmetic and logic unit using reversible logic gates international journal of vlsi system design and communication systems volume. The reversible logic synthesis technique is most important part of the longterm future of computing due to its low power dissipating characteristic. This introduces socalled ancillary inputs and garbage outputs, which already might obfuscate the function from an attackers perspective. For example, the reversible toffoli gate can implement all boolean functions. From transistorsto logic gates and logic circuits prof. Here, a bioelectronic interface based on biomolecule.
Study of tree multiplier using reversible logic gate. A circuit will be reversible if input vector can be specifically retrieved from output vectors and here is one to one correspondence between input and output 3. There exist many of these gates, but we restrict ourselves to the following basic reversible logic gates 4. Vectored mux is designed by cascading multiplexers in parallel with all the select inputs and enable as common to get the vectored output. However, the diagrams we use are easier to understand. A study on reversible logic gates of quantum computing. Osa design of optical reversible logic gates using. In this work, we proposed an adaptive genetic algorithm aga for synthesizing reversible logic circuits. Heuristic synthesis of reversible logic a comparative study core. Reversible fluxon logic for future computing kevin d. It finds application in low power digital designs, quantum computing, nanotechnology, dna computing etc. It has inputs a, b, c and outputs x, y and z as shown in fig 1. Quantum logic gates pdf classical reversible logic contained in quantum logic. In recent years reversible logic has come as a promising solution in the optical computing domain.
And, or, not, nand not and, nor not or, xor, and xnor not xor later building functions. Outline gener al issues basic notions rever sible gates. Reversible logic has received great importance in the recent years because of its feature of reduction in power dissipation. The quantum computation of the reversible mra circuits is also introduced. Reversible logic fundamentals reversible gates basic. Reversible logic circuits pawel kerntopf institute of computer science warsaw university of technology warsaw, poland. Universality put bit if and only if the logical and of all remaining input bits is satisfied. An ninput, noutput gate is reversible if it realizes a reversible function. Used to build logic functions there are seven basic logic gates. Logic gates actually look like weird bugs in real life. Fredkin gate, toffoli gate, interaction gate, and switch gate are typical ones. Energy reversible complementary nem logic gates kerem akarvardar, david elata, roger t. Reversible circuits embed the originally intended function which might not be reversible into a reversible one.
Pdf performance evaluation of reversible logic gates. Logic gates and circuits revision worksheet teaching. Here, we investigate basic properties of reversible logic gates and circuits, which are. We develop a canonical representation based on binary. Many classical logic gates are irreversible but quantum gates are reversible. Look at the below truth tables for better understanding. Pdf it has been realized that quantum computing is one of the latest technologies using reversible logic. In this paper, we provide icip piracy assessment of reversible logic. It is also known as the controlledcontrollednot gate, which describes its action. This creates trees of gates that depend on each other. The logic gates nandnor were mimicked by enzyme biocatalyzed reactions activated by sucrose, maltose and phosphate.
As the basic elements of any logic circuit, logic gates are used to realize boolean functions. Power dissipation of reversible circuit, under ideal physical circumstances, is zero. A reversible logic gate is a memoryless logic element that realizes an injective logical function. A more effective realization of bcd adder by using a new. This helps to determine the outputs from the inputs and also the inputs can be uniquely recovered from the outputs. Reversible logic is very important in lowpower circuit design.
If the output of an and gate is 0, the signals on the two. Sufficiency of twoqubit gates for quantum computation. It is easy to see that a conventional and gate is not reversible. This paper gives an overview of the reversible logic gates gathered from literature surveys.
Over 97% of binary reversible 33 gates and almost all reversible 44 gates are universal 26 in. By combining reversible logic gates, reversible circuits can perform. Synthesis of reversible logic and generating reversible logic circuit automatically with lower cost always has been a challenging task as reducing the search space is one of the major issues in the synthesis process using permutation. In a model of computation that uses deterministic transitions from one state of the abstract machine to another, a necessary condition for reversibility is that the relation of the mapping from nonzeroprobability states to their successors must be onetoone. The flow devices are constructed using a modular approach, where each flow cell is modified with one enzyme that biocatalyzes one chemical reaction. However, the third and the fourth gates keep the value of their target line since their positive control lines are assigned 0. The sheet presents a series of activities which focus on the and, or, and not gates. For an n bit vectored output, n number of multiplexers are to be cascaded together in parallel. Here we describe ballistic logic gates using simulated circuits. Exploiting reversible logic design for implementing adiabatic circuits.
Unlike many classical logic gates, quantum logic gates are reversible. Pdf basic reversible logic gates and its qca implementation. However, it is possible to perform classical computing using only reversible gates. The energy savings of reversible logic gates is due mostly to the fact that they do not require entropy be created when an operation is performed. Reversible logic gates has ability to to reduce the power dissipation which is the main requirement in low power vlsi design. Learning objectives 1 to be able to describe how data is stored within a computer in binary form. Fundamentals of reversible logic gates and their applications. The logic modules create rules for your circuit to follow, giving you more ability to create interesting and complex interactions. Development of tool for mapping conventional circuit to reversible.
So, this realization is more efficient and less costly than other realizations. To build such a reversible computer requires us to use new types of logic gates that are reversible, i. In logic circuits, the toffoli gate also ccnot gate, invented by tommaso toffoli, is a universal reversible logic gate, which means that any reversible circuit can be constructed from toffoli gates. Reversible logic, reversible gate, power dissipation. Ieee 754r format proceedings of the 19th international conference. Design and comparison of reversible and irreversible. Pdf reversible logic has various applications in various field like in nanotechnology, quantum computing, low power cmos, optical computing and dna. The reversible 11 gate is not gate with zero quantum cost is as shown in the figure 1. Enzymebased nand and nor logic gates with modular design. Sequential division circuit using reversible logic gates.
Reversible logic circuit synthesis and optimization using. A novel design of 3bit gray code counter using reversible. Synthesis of reversible logic circuit differs from the combinational one in many. The basic logic gates such as or, and, xor and xnor are not reversible logic gates. The circuits are based on an and gate that is designed to be thermodynamically and kinetically reversible and to respond nonlinearly to the concentrations of its input molecules. In recent years, reversible logic circuits have attracted considerable attention in improving some. Ieee 754r format proceedings of the 19th international conference on vlsi. Synthesis of reversible logic circuit differs from the combinational one in many ways. An output of one logic gate can be an input to another logic gate. A variety of reversible gates have been proposed 19, 3, 4.
Reversible computing is a model of computing where the computational process to some extent is timereversible. The important reversible gates used for reversible logic synthesis are feynman. Reversible logic gates a reversible logic gate is an ninput noutput logic device with onetoone mapping. Bioelectronic interface connecting reversible logic gates. Reversible circuits are also interesting because the loss of information implies energy loss 2. Reversible logic gates have same number of input and outputs, since in reversible circuits no bit loss is there hence ideally in reversible circuits. But in current time power consumption is the main factor, which is taken. Reversible gates several reversible gates have been proposed over the years, e.
Synthesis of reversible logic circuits university of michigan. Reversible gates are useful for application in low power complementary metaloxide semiconductors, with less dissipation, and in quantum computing. Conclusion and future scope reversible logic gates form the building blocks of quantum computing. In this lesson, you will learn how to combine various inputs to achieve desired output results with the help of logic gates and, or, nand, nor, xor. Reversible control unit reversible control unit has 9 reversible gates 3 not gate, 2. Younis and knight 16 showed that some reversible circuits can be made asymptotically energylossless if their delay is allowed to be arbitrarily.
Conservative and reversible logic gates are widely known to be compatible with revolutionary computing paradigms such as optical and quantum computing. The subunits performing andor boolean logic operations were designed using maltose phosphorylase and cooperative work of invertaseamyloglucosidase, respectively. A gate or circuit that does not loose information is called reversible. What is the difference between reversible logic gates and.
Reversible logic synthesis by quantum rotation gates. Design of sequential circuits using reversible logic has been presented in 7 and 8. In current scenario, the reversible logic design attracting more interest due to its low power consumption. Osborn1,2, waltraut wustmann1 1laboratory for physical sciences, usa 2joint quantum institute, usa email. Logic gates digital circuit that either allows a signal to pass through it or not. Keywords cybernetics, boolean functions, logic abstract modi. Design of low power arithmetic and logic unit using. Also in the synthesis of reversible circuits direct fanout is not allowed as onetomany concept is not reversible. Reversible logic gates a reversible logic gate is an ninput noutput logic device with onetoone mapping 3.
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