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Performance Analysis of High Speed Domino CMOS Logic Circuits

Performance Analysis of High Speed Domino CMOS Logic Circuits

with higher complication forces us to enhance the performance, area, efficiency and practicality of arithmetic logic circuits. Several efforts are targeted on the development of adder styles [4]. Since the utilization of carry look-ahead principle for high-speed arithmetic units, one in all, the challenges in VLSI processor style these days is structured for constructing CLA circuits, exactly for the 8-bit circuits while not limiting the purposeful flexibility. A coffee power high performance FTL circuit technique is projected in [5] for reducing power dissipation and decreasing propagation delay in domino logic. The low power FTL dynamic logic is achieved with the help of feed through dynamic CMOS logic structure [6]. Wang, Tsai [7] used the 8-bit CLA victimization- the dual-Vt domino logic blocks that are organized in a very PLA- like manner and synchronously triggered. It is enforced on chemical element to verify the facility reduction also because of the preservation of high speeds [8]. Proposed an 8-bit pipelined CLA victimization- the dual- Green Mountain State domino logic blocks to scale back the facility dissipation. Dual-Vt Domino Logic Circuits foreseen for reducing sub-threshold discharge current in domino logic circuits is projected in [9]. Sleep switch twin threshold voltage domino logic with reduced sub-threshold logic gate compound discharge current is projected and tried in [10]. The high speed arithmetic circuit obtained victimization FTL logic in [11]. Normally, domino CMOS logic is widely employed in high performance integrated circuits. It reduces the device count and chemical element space, and improves performance in comparison to the quality totally complementary static CMOS logic [12].
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ABSTRACT : In this Paper, design of high speed, low power 1-bit full adder using both logic gates and complementary

ABSTRACT : In this Paper, design of high speed, low power 1-bit full adder using both logic gates and complementary

TABLE II represents the truth table of proposed full adder. If we compare TABLE I and TABLE II of standard and proposed full adder, the functionality achieved by substituting XOR gate in place of OR gate is same as standard full adder. Therefore, XOR gate can be used to generate final CARRY output. Now the proposed and standard full adder logic circuits are implemented using CMOS logic in Cadence Virtuoso tool to compare the average power and delay generated. The circuits are implemented in 180nm technology with supply voltage as 1.8V.

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Comparative Performance Analysis of XOR - XNOR Function Based High - Speed CMOS Full Adder Circuits

Comparative Performance Analysis of XOR - XNOR Function Based High - Speed CMOS Full Adder Circuits

The second adder is complementary pass transistor logic (CPL) uses 32 transistors with swing restoration. Most CPL gates can have an complexity in interconnection at the layout level with the increase in power and delay. For low power applications Pass Transistor Logic (PTL) is best suitable technique and explanation was given in .The advantage of Pass Transistor Logic (PTL) is that either PMOS or NMOS is enough to implement a complete design [6]-[8] and so number of transistors gets decreased and also smaller input loads, especially for NMOS network and also by this PTL we can eliminate short circuit energy dissipation.
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Nanoscale cryptography: opportunities and challenges

Nanoscale cryptography: opportunities and challenges

CMOS and nanomaterials (such as CarbonNanoTube bundle interconnects and nanotube/nanowire crossbar memories), thus taking advantages of both mature CMOS technology and novel advances in nanotechnology. The basic idea for such circuits is to combine the advantages of current CMOS technology including flexibility and rea- sonable fabrication yield with nanoscale devices, assem- bled on a pre-fabricated nanowire fabric, enabling very high function density at modest fabrication cost. Such ar- chitectures allow for significant design versatility. For ex- ample, while nano portion is restricted to regular structures, the CMOS portion can be used for the imple- mentation of any arbitrary logic circuit. Perhaps one of the most promising structure for such circuits is an FPGA-like architecture combining a CMOS stack and two-level nanowire crossbar with nanodevices formed at each nanowire cross point together with the ability to re- configure the circuits around nanodevices defects. Such reconfiguration is essential for any mixed CMOS-Nano system because the lack of enough alignment accuracy and also due to the fact that such a fabrication can hardly provide 100 % yield. It has been shown that such architec- ture is defect tolerant and even with a high degree of de- fect rate can provide much better performance in terms of area and speed at acceptable power consumption when compared to circuits which use CMOS alone [18, 19]. These circuits work with two-terminal nanodevices whose are electrically activated or deactivated at the cross-points of the mesh and their fabrication is substantially less challenging than their three-terminal counterparts. Of course, the limited functionality of two terminal devices is compensated by transistors of the CMOS subsystem.
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Evaluation of Power Delay Product for Low Power Full Adder Circuits based on GDI Logic Cell using Mentor Graphics

Evaluation of Power Delay Product for Low Power Full Adder Circuits based on GDI Logic Cell using Mentor Graphics

The wish to improve the performance of logic circuits, once based on traditional Complementary Metal Oxide Semiconductor (CMOS) technology, resulted in the development of many logic design techniques during the last two decades. One form of logic that is popular in low- power digital circuits is Pass Transistor Logic (PTL). Formal methods for deriving pass-transistor logic have been presented for n-channel Metal Oxide Semiconductor Field Effect Transistor (NMOS). They are based on the model, where a set of control signals is applied to the gates of nMOS transistors. Another set of data signals are applied to the sources of the n-transistors. Some of the main advantages of PTL over standard CMOS design are 1) high speed, due to the small node capacitances; 2) low power dissipation, as a result of the reduced number of transistors; and 3) lower interconnection effects due to a small area. But the implementation of PTL has two basic problems: 1) slow operation at reduced power supply as the threshold voltage drop across the single channel pass transistor results in low drive current, 2) the high input voltage level at the regenerative inverter is not V dd , the p-channel
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Design and Comparative Analysis of EEAL Sequential Circuit for Low Power VLSI Application

Design and Comparative Analysis of EEAL Sequential Circuit for Low Power VLSI Application

Abstract—A new design of adiabatic circuit, called Energy Efficient Adiabatic Logic (EEAL) is proposed [1]. In adiabatic logic, which dissipates less power than static CMOS logic, have been adiabatic circuits called energy efficient adiabatic logic introduced as a promising new approach in low power circuit design[2]. In this paper, my primary aim is to improve power delay product (PDP) of the proposed adiabatic circuits as compared with conventional CMOS circuits. In this paper work, we use two phase split level sinusoidal power supply which is used for low power high speed adiabatic circuits and diode is replaced by MOS transistor at charging and discharging path whose gate is controlled by power clock. By using this technique power dissipation of the diode is eliminated. In this paper we have designed and simulated EEAL Based Master-Slave JK Flip Flop, and EEAL Based 3- bit Counter .All the simulation in this paper have been implemented by VIRTUOSO SPECTRE simulator of cadence with the 0.18 micrometer UMC technology MOS transistor model under 1.8- volts peak to peak split level sinusoidal power clock supply. From the simulation result, we have find that proposed logic circuits can save significant amount of energy compared to CMOS.
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Design and analysis of novel high 
		performance CMOS domino logic for high speed applications

Design and analysis of novel high performance CMOS domino logic for high speed applications

Dynamic logic style is popular due to its fast processing speed and less power dissipation in high performance circuit design as compared to static complementary metal-oxide-semiconductor (CMOS) logic style. However, dynamic logic has less noise tolerance and charge sharing problems and hence it is not widely accepted for all high speed applications. As a consequence, a domino logic circuit is proposed for applications such as high-speed adder, comparator and arithmetic and logic unit (ALU) design. Furthermore, the proposed domino logic circuit provides multi standard advantages such as less propagation delay, less power dissipation and high fan out capability. The proposed circuit is simulated and tested in T SPICE with 45 nm technology. Moreover, it is compared with other domino logic circuits in terms of power dissipation and propagation delay.
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Adiabatic Logic Circuits for Low Power,  High Speed Applications

Adiabatic Logic Circuits for Low Power, High Speed Applications

After comparing results of PFAL and ECRL basic gates with CMOS gates we got good improvement in results. As industry demands devices with low power and fast operating ECRL and PFAL logic gates are most suitable and useful in any circuitry. This basic gates ca be used in building adder, full adder, multiplexer, flip-flop. Here we have made 2:1 mux using PFAL and ECRL gate which is very fast in operation and less power consuming.

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Performance Analysis of CMOS and GDI Comparators

Performance Analysis of CMOS and GDI Comparators

The rapid development of portable digital applications, the demand for increasing speed, compact implementation and low power dissipation triggers numerous research efforts. The wish to improve the performance of logic circuits, once based on traditional CMOS technology resulted in the development of many logic design techniques during the last two decades. In the era of mobile electronics we require digital circuits with high speed, low circuit density and low power dissipation Modifications are performed on conventional CMOS design which has high noise immunity and no static power dissipation. Many researches are going on this area [1].
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RIPPLE CARRY ADDERS USING LOW-VOLTAGE BOOSTED CMOS DRIVERSSandeep Khantwal*, Ritu Juneja

RIPPLE CARRY ADDERS USING LOW-VOLTAGE BOOSTED CMOS DRIVERSSandeep Khantwal*, Ritu Juneja

This paper describes a high speed boosted CMOS differential logic which is used in ripple carry adders. The proposed logic style improves switching speed by boosting the gate–source voltage of transistors along timing-critical signal paths. Test sets of logic gates were designed in a 0.18-μm CMOS process, whose comparison results indicated that the energy–delay product of the proposed logic style was improved by up to 50% compared with conventional logic styles at supply voltage of 1.8V. The experimental result for 32 bit ripple carry adder using the proposed logic style revealed that the addition time is reduced as compared with the conventional CMOS circuits.
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Single Electron Transistor Based IC Architecture Design for Car Intrusion Prevention: A Case Study

Single Electron Transistor Based IC Architecture Design for Car Intrusion Prevention: A Case Study

The necessity to design SET based logic circuits with its simulation besides fabrication oriented research show tremendous impact to replace present day CMOS technology in near future. Eminent Researchers have comprehended this importance and thus have now stirred their focus on realizing application oriented SET design. Undoubtedly, it is a much new approach and very few of the Researchers have tried their hands in this sector. Employing SET technology in real life applications is not only thrilling but also a challenging field to explore. Accomplishment of SET logic devices for real time circuit realization is still lagging far behind; even though it is a rising field of low dimensional device structure oriented research that has opened a new horizon for present and future device application. In the present day to deal with the desire of low power consuming high speed nano
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High Speed 4bit/8bit QSD Adder With Reversible Logic Gate

High Speed 4bit/8bit QSD Adder With Reversible Logic Gate

Abstract :- The need for high speed digital circuits became more prominent as portable multimedia and communication applications incorporating information processing and computing. The drawback of modern computers lead to the deterioration in performance of arithmetic operations such as addition, subtraction, division, multiplication on the aspects of carry propagation time delay, high power consumption and large circuit complexity. This system explores the carry free n digits addition/subtraction as the carry propagation delay is most important factor regarding the speed of any digital system. In this paper, Quaternary signed digit (QSD) numbers whose radix is 4 are used in arithmetic operations to achieve the carry free arithmetic operations. The range of QSD number is from -3 to 3.In any n digit QSD number ,each digit can be represented by a number from the digit set [-3,-2,-1,0,1,2,3]. In this paper , we are improving the performance of the QSD addition by apply reversible logic gate . QSD addition is performing for the 4 bit,8 bit . In the normal condition QSD adder gives the high delay performance . We have to reduce the delay of the 4 bit,8 bit QSD adder . For reduce the delay we apply pipelining and Peres reversible logic gate . Pipelining and Peres reversible gate will be able to reduce the delay of the 4 bit , 8 bit QSD adder .
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A Technique to Reduce Power Consumption Delay & Area in Wide Fan-In Domino OR Logic

A Technique to Reduce Power Consumption Delay & Area in Wide Fan-In Domino OR Logic

which has a lower leakage and higher noise immunity without dramatic speed degradation for wide fan-in gates. In this domino circuit a chain of evaluation network uses well known stacking effect technique to reduce the leakage. The stacking effect and current mirror makes the circuit more noise immune and considerably improves the Power Delay Product (PDP) as compared to the other existing domino logic. The leakage current is also decreased by exploiting the footer transistor in diode configuration, which results in increased noise immunity. DCLCR domino circuit reduces the leakage power consumption by maintaining the same level of delay. By connecting the gate of the transistor M K1 to its drain power is
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Design of Multiplier and Divider Using Reversible Logic Gates with Vedic Mathematical Approach

Design of Multiplier and Divider Using Reversible Logic Gates with Vedic Mathematical Approach

As per Landauer, for irreversible logic, each bit of information lost generates kTln2 Joules of heat energy, where k is Boltzmann's constant and T is absolute temperature at which the computation is performed. For room temperature T, the amount of heat dissipated for one bit is small i.e. 2.9×10- 21 J. The current processors, first of all dissipate 500 times this amount of heat every time a bit is lost. Secondly, assuming every transistor out of more than 4×107 dissipates heat at the processor frequency of 2GHz, the figure becomes 4×1019*kTln2 J/sec. Bennett [9] showed that if a computation is carried out in Reversible logic zero energy dissipation is possible, as the amount of energy dissipated in a system is directly related to the number of bits erased during computation. The design that does not result in information loss is irreversible. The number of outputs in a reversible gate or circuit has the same as the number of inputs. While constructing reversible circuits with the help of reversible gates, some restrictions should be strictly maintained:
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High-accuracy function synthesizer circuit with applications in signal processing

High-accuracy function synthesizer circuit with applications in signal processing

It exists in literature a relatively small number of func- tion synthesizer circuits implemented in CMOS technol- ogy [4,33,44-46], these applications being dedicated to the realization of a limited number of mathematical functions. In [44], the approximation of the implemented function can be obtained by adding the weighted output currents of a number of basic building blocks, built around a basic current squarer, and a constant current, the circuit pre- senting the disadvantage of a relatively large complexity. The circuit proposed in [45] is based on approximating the required function using the first three terms of its Tay- lor series expansion. The approximations can be imple- mented by adding the output currents of a weighted current square, a weighted current amplifier (or attenu- ator), and a constant current. The errors are mainly caused by the small value (two) of the approximation order and, in consequence, they are relatively large. Add- itionally, from the same reason, the range of the input
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A New Low-Voltage, Low-Power and High-Slew Rate CMOS Unity-Gain Buffer

A New Low-Voltage, Low-Power and High-Slew Rate CMOS Unity-Gain Buffer

Abstract: Class-AB circuits, which are capable of dealing with currents several orders of magnitude larger than their quiescent current, are good candidates for low-power and high slew-rate analog design. This paper presents a novel topology of a class AB Flipped Voltage Follower (FVF) that has better slew rate and the same power consumption as the conventional class-AB FVF buffer previously presented in literature. It is thus suitable for low-voltage and low-power stages requiring low bias currents. These buffers have been simulated using 0.5 µm CMOS Technology models provided by IBM. The buffer consumes 16 µA from a 0.9 V supply and has a bandwidth of 52 MHz with an 18 pF load. It has a slew rate of 10.3 V/µs and power consumption of 36 µw.
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II. REVIEW OF FOURTEEN STATE OF THE ART FULL ADDER CELLS

II. REVIEW OF FOURTEEN STATE OF THE ART FULL ADDER CELLS

is in consumption power and falling and rising times so this subject looks simple due to the difference in NMOS and PMOS transistors speed .After the simulation, the layout of circuit is drawn. By the post simulation result along with a few corrections have achieved in sizes that the circuit has an accurate operation. Simulation results are performed by HSPISE based on 0.18µm CMOS technology. The power supply is 1.8v. The 5% variation of power supply is tested. This design is also compatible with transistor size 10% variation. In the table II, comparison of similar works and their results have been there. The snapshot of the waveforms at 1.8v is shown in figure 5.
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High Speed 64 Bit Binary Comparator using Three Stages with CMOS Logic Style

High Speed 64 Bit Binary Comparator using Three Stages with CMOS Logic Style

High-speed 64-bit binary comparator using three stages with CMOS logic style is proposed in this brief. Comparison is most basic arithmetic operation that determines if one number is greater than, equal to, or less than the other number. Comparator is most fundamental component that performs comparison operation. This brief presents comparison of modified and existing 64-bit binary comparator designs concentrating on delay. Means some modifications have been done in existing 64- bit binary comparator design to improve the speed of the circuit. Comparison between modified and existing 64-bit binary comparator designs is calculated by simulation that is performed at 90nm technology in Tanner EDA Tool.
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Design of Low Power Energy Efficient CMOS Circuits with Adiabatic Logic

Design of Low Power Energy Efficient CMOS Circuits with Adiabatic Logic

"Adiabatic" is taken from a Greek word and it describes thermodynamic process that shows no energy exchange with the surroundings. In real-time systems such perfect processes cannot be obtained due to some factors which causes dissipation. But dissipation can be decreased by reducing the operational speed and conditional transistor switching. It is also called as "Energy recovery CMOS", since it reuses the stored energies in the load capacitors. The ideal condition of the adiabatic process is achieved when the switching process is retarded. Practically energy dissipation cannot be reduced to be zero because the charge cycle is always associated with an adiabatic and a non-adiabatic component. The conservation of energy is achieved in the circuit rather than dissipation.
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Comparative Analysis of Conventional CMOS and Energy Efficient Adiabatic Logic Circuits

Comparative Analysis of Conventional CMOS and Energy Efficient Adiabatic Logic Circuits

In order to reduce the dynamic power, an alternative approach to the traditional techniques of power consumption reduction, named adiabatic switching, has been proposed in the last years. In such approach, the process of charging and discharging the node capacitances is carried out in a way so that a small amount of energy is wasted and a recovery of the energy stored on the capacitors is achieved. In literature, various kinds of adiabatic circuits proposed all of them can be grouped into two fundamental classes: fully adiabatic circuits and quasi- adiabatic or partial energy recovery circuits. In the first class, in particular working conditions can consume asymptotically zero energy for operation, the large area occupation and the design complexity make these circuits not competitive with traditional CMOS where as in second class circuits designed to recover large portion of the energy stored in the circuit node capacitances. This energy loss drawback however allows a good trade-off between circuit complexity and then area occupation.In this paper different circuit are presented, and comparison of conventional CMOS adder circuits [1][2][4][5][6], 2PASCAL [10] ,and also comparison of adiabatic families[3][7][8][9] is done. In this work we analyzed the performance of conventional and adiabatic adder circuit’s in-terms of power consumption.
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