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Updates found with 'different levels'

CFD (Computational fluid dynamics) TITLES1. Flow control over airfoils using different shaped dimples2. Analysis of flow field across blunt fin with dimples –experimentation3. Aerodynamic characteristic and flow pattern on dimples structure of a sphere4. Numerical flow simulation for aircraft5. Analysis of surface augmentation of airfoil sections via flow visualization techniques6. Experimental and numerical investigations of a high performance co-flow jet airfoil7. Modelling & implementation of aerodynamic zero-lift drag into adapdt8. Cfd analysis on the main-rotor blade of a scale helicopter model using overset meshing9. Investigation of different airfoils on outer sections of large rotor blades10. Analysis of foils and wings operating at low reynolds numbers11. A computational study of the clap and fling aerodynamic mechanism12. Aeroelastic analysis of aircraft with control surfaces using cfd effects of winglets on a first-generation jet transport wing13. Aerodynamic analysis of the use of multi-winglets in light aircrafts14. Drag analysis of an aircraft wing model with and without bird feather like winglet15. Aerodynamic analysis of a blended-wing-body aircraft configuration16. Drag reduction in aircraft model using elliptical winglet17. Experimental investigation on the effect of multi-winglets18. Aerodynamic analysis of multi-winglets for low speed aircraft19. Aerodynamic efficiency study of modern spiroid winglets near-field tip vortex behind a swept wing model20. Analytic and experimental investigation of three-winglets21. Aerodynamics of wingtip sails22. Performance analysis of a wing with multiple winglets23. Cfd analysis of winglets at low subsonic flow24. The design of winglets for low-speed aircraft25. Design of multiple winglets to improve turning and soaring characteristics of angelo d’arrigo’s hangglider26. Numerical study of wingtip shed vorticity reduction by wing boundary layer control27. Numerical simulation of missile28. Heat transfer studies on blunt body at hypersonic speeds29. Simulation of flow over a wedge30. Design and develop a vortex generator based on boundary layer theory31. Designing and simulating flow across axisymmetric inlet32. Flow inside a vortex tube 33. Horizontal tail analysis (2-seat amphibious airplane)34. Analysis of the z-wing configuration35. Numerical analysis of injectors in rocket propellant36. Design and analysis of ramjet engine37. Cfd analysis of thrust vector control in nozzle38. Numerical investigation of aero spike nozzle39. Aerodynamic design study of ground vehicles40. Cfd analyses of ship hull forms41. Cfd prediction of loads on marine structures42. Design and analysis of a radial turbine with back swept blaring43. Evaluation of cfd sub-models for the intake manifold port flow analysis44. A vehicle body drags analysis using computational fluid dynamics45. Cfd calculation of convective heat transfer coefficients and validation46. A study of computational fluid dynamics applied to room air flow47. Cfd analysis of airflow and temperature distribution in buildings48. Assessment of turbulence modeling for cfd 49. Cfd analysis of diffuser50. Cfd analysis of engine valve 51. Nozzle design optimization for to reduce noise for turbo jet engine.52. Air and fuel flow interaction in combustion chamber for various injector locations53. Cfd investigation of airflow on a santro zing car by using fluent54. Cfd analysis of rocket nozzle55. Cfd analysis of supersonic exhaust in a scramjet engine56. aerodynamic design for bus/car vehicle57. Cfd analysis of exhaust manifold58. Cfd analysis of centrifugal fan59. Cfd analysis of intake manifold in si engines60. Cfd modeling of the automobile catalytic converter61. Cfd analysis of fluid flow and heat transfer in a single tube-fin arrangement of an automotive radiator62. Computational flow field analysis of a vertical axis wind turbine63. Cfd analysis of mixed flow pump impeller64. Cfd analysis of flow through venture meter to determine the coefficient of discharge65. Design improvements on mixed flow pumps by means of computational fluid dynamics66. Turbulent flow simulation in kaplan draft tube67. Flow analysis of marine propeller68. Design and analysis of globe valve as control valve using cfd software69. Numerical analysis of wax melting70. Conjugate heat transfer analysis in electronics devices
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Mechanical Design Project Titles Mechanical Design project titles1. Design & analysis of connecting rod using aluminum silicon carbide 2. Design, animation & analysis of agricultural chipper 3. Design, animation & analysis of hybrid air engine 4. Design & analysis of support platform for small form factor pc in ruggedness testing environment 5. Analysis of noise reduction in rotor blade by using composite material 6. Modeling and analysis of screw engine 7. Stress analysis of washing machine drum 8. 3d thermal analysis of liquid propellant rocket with bell nozzle 9. Modeling & structural analysis of piston by using mg-sic 10. Modeling, analysis of tri axial tipper (different angle) 11. Design & analysis of poppet valve using composite 12. Failure analysis and optimization of planner machine horizontal mechanism 13. Design and analysis of industrial pneumatic trolley 14. Design and analysis of aluminum & copper connecting rod 15. Modeling & analysis of suspension steering system 16. Design and analysis of piston by composite materials 17. Design, animation & analysis of shredding, chipping and murching 18. Tribological analysis on disc brake pad 19. Dynamic balancing of rotor 20. Design & analysis of piston by using composite materials aluminum & magnesium 21. Modeling & analysis of motorized screw jack 22. Wear rate analysis of nano coated cutting tools 23. Design & analysis of composite leaf spring 24. Design & analysis of vacuum assisted wall climber 25. Design & analysis of splines elimination of starter motor shaft 26. Multipurpose agricultural machinery dynamic analysis for shaft 27. Modeling & analysis of leaf spring under dynamic load condition for tata sumo 28. Design & analysis of supercharging an engine using vehicle suspension 29. Analysis of failure mechanism of 90? Pipe elbow with in-plane and out-of plane loading 30. Analysis of cam shaft using composite material 31. Design and analysis of composite helical gear 32. Productivity improvement by automatic lifting 33. Modeling and structural analysis on flight wing by using ansys 34. Design and analysis of a hydraulic die ejector for a powder metallurgy component 35. Structural analysis of heavy vehicle chassis using honey comb structure 36. Study of wear behavior of aluminum based composite fabricated by stir casting technique 37. Design and stress analysis of four-post rollover protective structure of agricultural-wheeled tractor 38. Design and analysis of scissor jack 39. 3d modeling and analysis of micro gas turbine compressor blade 40. Design, animation & analysis of suspension steering system 41. Design & analysis of piston by using composite materials aluminum & magnesium 42. Design & analysis of stirling engine 43. Design and analysis of electromagnetic engine 44. Design and analysis of the windmill by the composite material 45. Design & analysis of hybrid magnetic bearing 46. Design & analysis of vacuum assisted wall climber 47. Redesign of bead extruder head assembly (analysis) 48. Design & analysis of screw engine 49. Design & analysis of composite gear wheel 50. Analysis of impeller using aluminum composite 51. Design & analysis of auto tilting mechanism in car 52. Design, modeling and analysis of a 3 stage epicyclic planetary reduction gear unit of a flight vehicle 53. Finite element analysis of normal and vented disc brake rotor 54. Design and analysis of rocker arm using composite material 55. Design and analysis of composite over bridge coupling 56. Modeling and analysis of drum brake 57. Analysis of adhesively bonded single lap riveted joint using ansys 58. Finite element analysis and natural frequency optimization of engine bracket 59. Analysis of helical coil compression spring for three wheeler automotive front suspension 60. Fatigue analysis of aluminum alloy wheel under radial load 61. Design and analysis of dumped body 62. Design and analysis of connecting rod using aluminum alloy 7068 t6, t6511 63. Finite element analysis and optimization of piston using cae tools 64. Design and analysis of three axis hydraulic modern trailer 65. Design and analysis of helical spring with shock absorber 66. Modeling and analysis of automobile chassis brackets 67. Design and analysis of disappearing car door 68. Design and analysis of wind car 69. Modeling and analysis of bicycle frame 70. Studies on friction stir welding aa2024 & aa6061 71. Stress analysis of mechanisms for trolley-cum-wheelchair 72. Stress analysis of seat backrest of car 73. Modeling and squeal analysis of brake disc rotor using ansys 74. Design and analysis of composite brake pedal: an ergonomic approach 75. Thermal analysis on composite materials 76. Modeling & analysis solar assisted air dryer 77. Analysis of electricity production mechanical system 78. Structural analysis of rivet joint 79. Design & analysis of special purpose lifting equipment 80. Finite element analysis of bus body structure 81. Static and vibration analyzing shock absorber power generation using piezo electric 82. Design & analysis of mechanical locking system for fuel flap 83. Design & analysis of coil spring with different materials 84. Analysis of frp composite cylinders 85. Modeling and analysis of a motorcycle wheel rim 86. Design and analysis of jet wind turbine blades 87. Comparative analysis of tractors trolley axle by using fea(by considering change in materials existing shape and size) 88. Design and analysis of electromagnetic suspension system 89. Design and analysis of crane hook assembly 90. Vibration analysis of leaf spring 91. Design and analysis of composite helical gear 92. Analysis of windmill blade by using composite material 93. Analysis of triangular air compressor with common combustion chamber 94. Transient analysis of disk brake by using ansys software 95. Impact analysis on front sub frame system using composite material 96. Design and analysis of automobile frame 97. Finite element analysis of the classic bicycle wheel 98. Design & analysis of quick lifting jack with gear arrangement 99. Study and analysis of aircraft fuselage body structure by using composite material
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IEEE 2016 - 2017 Power Electronics and Power Systems Titles1) Investigation of Negative-Sequence Injection Capability of Cascaded H-Bridge Converters in Star and Delta Configuration2) A Novel Control for a Cascaded Buck Boost PFC Converter Operating in Discontinuous Capacitor Voltage Mode3) A Single-Phase Buck-Boost Matrix Converter with Only Six Switches and Without Commutation Problem4) Adaptive Neuro Fuzzy Inference System Least Mean Square Based Control Algorithm for DSTATCOM5) Average-Value Model of Modular Multilevel Converters Considering Capacitor Voltage Ripple6) LMF Based Control Algorithm for Single Stage Three-Phase Grid Integrated Solar PV System7) Analysis of bi-directional piezoelectric-based converters for zero-voltage switching operation8) A Multi-Level Converter with a Floating Bridge for Open-Ended Winding Motor Drive Applications9) Variable Duty Cycle Control for Quadratic Boost PFC Converter10) Pulse Pattern Modulated Strategy for Harmonic Current Components Reduction in Three-Phase AC-DC Converters11) Practical Layouts and DC-Rail Voltage Clamping Techniques of Z-Source Inverters12) A Low Capacitance Cascaded H-Bridge Multi-Level StatCom13) Impedance networks and its Application in Power for Electric Traction Systems14) Phase Current Balance Control Using DC-Link Current Sensor for Multi-Phase Converters with Discontinuous Current Mode Considered 15) Efficient Single Phase Transformerless Inverter for Grid-Tied PVG System With Reactive Power Control16) Single-Stage High Power Factor Converters Requiring Low DC-Link Capacitance to Drive Power LEDs17) High Efficiency Bi-Directional Converter for Flywheel Energy Storage Application18) Z-Source Resonant Converter with Power Factor Correction for Wireless Power Transfer Applications19) Design of External Inductor for Improving Performance of Voltage Controlled DSTATCOM20) A Single-Switch AC-DC LED Driver Based on a Boost-Flyback PFC Converter with Lossless Snubber21) Control and Analysis of the Modular Multilevel DC De-Icer with STATCOM Functionality22) Combined Phase Shift and Frequency Modulation of a Dual Active Bridge AC-DC Converter with PFC23) Least Power Point Tracking Method for Photovoltaic Differential Power Processing Systems24) Experimental Investigation on a Hybrid Series Active Power Compensator to Improve Power Quality of Typical Households25) Soft Start and Voltage Control of Induction Motors using Floating Capacitor Hbridge Converters26) High Performance Predictive Control of Quasi Impedance Source Inverter27) Analysis of the Integrated SEPIC-Flyback Converter as a Single-Stage Single-Switch Power-Factor-Correction LED Driver28) Matrix Converter Based Active Distribution Transformer29) Universal AC Input High Density Power Adapter Design with a Clamped Series Resonant30) SVM Strategies for Common-Mode Current Reduction in Transformerless Current-Source Drives at Low Modulation Index31) A Single-stage High Frequency Resonant AC/AC Converter32) Analysis and Control of Neutral-Point Voltage for Transformerless Three-Level PV Inverter in LVRT Operation33) A Hybrid-STATCOM with Wide Compensation Range and Low DC-Link Voltage34) A Single-Stage Single-Switch LED Driver Based on Class-E Converter35) Impedance Coordinative Control for Cascaded Converter in Bidirectional Application36) A DC-voltage Controlled Variable Capacitor for Stabilizing the ZVS Frequency of a Resonant Converter for Wireless Power Transfer37) Combined LMS-LMF Based Control Algorithm of DSTATCOM for Power Quality Enhancement in Distribution System38) Interleaved SEPIC Power Factor Pre-Regulator Using Coupled Inductors in Discontinuous Conduction Mode with Wide Output Voltage39) Model Predictive Control Scheme of Five-Leg AC-DC-AC Converter-Fed Induction Motor Drive40) A Virtual RLC Damper to Stabilize DC/DC Converters Having an LC Input Filter while Improving the Filter Performance41) Synchronous Power Controller with Flexible Droop Characteristics for Renewable Power Generation Systems42) A Buck Power Factor Correction Converter with Predictive Quadratic Sinusoidal Current Modulation and Line Voltage Reconstruction43) A Real-time Variable Turn-off Current Strategy for PFC Converter with Voltage Spike Limitation and Efficiency Improvement44) A Common Grounded Z-Source DC-DC Converter with High Voltage Gain45) A Digital Predictive Current Mode Controller for Single Phase High Frequency Transformer Isolated Dual Active Bridge DC to DC Converter46) A High-Voltage Compliant Current-to-Digital Sensor for DC-DC Converters in Standard CMOS Technology47) A New Single-Switch Isolated High-Gain Hybrid Boosting Converter48) A Novel Approach to Generate Effective Carrier-Based Pulsewidth Modulation Strategies for Diode-Clamped Multilevel DC-AC Converters49) A Novel Medium-Voltage Modular Multilevel DC-DC Converter50) A PWM Plus Phase-Shift Controlled Interleaved Isolated Boost Converter Based on Semi-Active Quadrupler Rectifier for High Step-Up Applications51) Analysis and Design of Current-Fed High Step Up PWM Controlled Quasi-Resonant DC-DC Converter for Fuel Cell Applications52) Analysis and Implementation of a Non-Isolated Bidirectional DC-DC Converter with High Voltage Gain53) Capacitor Aging Detection in DC-DC Converter Output Stage54) Derivation of Dual-Switch Step-Down DC/DC Converters with Fault-Tolerant Capability55) Design and Analysis of a High Efficiency DCDC Converter with Soft Switching Capability for Renewable Energy Applications Requiring High Voltage Gain56) Design and Steady State Analysis of Parallel Resonant DC-DC Converter for High Voltage Power Generator57) Digital Control of a High Voltage (2.5 kV) Bidirectional DC-DC Flyback Converter for Driving a Capacitive Incremental Actuator58) Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV59) Effective Voltage Balance Control for Bipolar-DC-Bus Fed EV Charging Station with Three-Level DC-DC Fast Charger60) Feed-Forward based Control in a DC-DC Converter of Asymmetric Multistage Stacked Boost Architecture61) High Step-Up/Step-Down Soft-Switching Bidirectional DC-DC Converter with Coupled-Inductor and Voltage Matching Control for Energy Storage Systems62) High-Efficiency Asymmetric Forward-Fly back Converter for Wide Output Power Range63) Isolated Double Step-down DC-DC Converter with Improved ZVS Range and No Transformer Saturation Problem64) Minimum-Current-Stress Scheme of Dual Active Bridge DC-DC Converter with Unified-phase-shift Control65) Model Predictive Control of Capacitor Voltage Balancing for Cascaded Modular DC-DC Converters66) Model Predictive Voltage Control for Single Inductor Multiple-Output DC-DC Converter with Reduced Cross Regulation67) Parasitics Assisted Soft-switching and Secondary Modulated Snubberless Clamping Current-fed Bidirectional Voltage Doubler for Fuel Cell Vehicles68) Stability Analysis and Stabilization methods of DC Microgrid with Multiple Parallel-Connected DC-DC Converters loaded by CPLs69) Steady-State Analysis of Inductor Conduction Modes in the Quadratic Boost Converter70) Suppression of the Peak Harmonics from Loads by Using a Variable Capacitance Filter in Low-Voltage DC/DC Converters71) Topology Derivation and Generalized Analysis of Zero-Voltage-Switching Synchronous DC-DC Converters with Coupled Inductors72) Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft Switching of Isolated Bidirectional DC-DC Converter73) A New Transformerless Buck-Boost Converter With Positive Output Voltage74) Derivation of Dual-Switch Step-Down DC/DC Converters with Fault-Tolerant Capability75) Digital Sensorless Current Mode Control Based on Charge Balance Principle and Dual Current Error Compensation for DC–DC Converters in DCM
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IEEE 2016 - 2017 Vlsi Titles1. Analyzing the Effect of Clock Jitter on Self-Oscillating Sigma Delta Modulators2. Hypergraph Based Minimum Arborescence Algorithm for the Optimization and Reoptimization of Multiple Constant Multiplications.3. A High-Throughput Energy-Efficient Implementation of Successive Cancellation Decoder for Polar Codes Using Combinational Logic4. Adaptive Multibit Crosstalk-Aware Error Control Coding Scheme for On-Chip Communication5. A Method to Design Single Error Correction Codes With Fast Decoding for a Subset of Critical Bits6. Multiple Constant Multiplication Algorithm for High-Speed and Low-Power Design7. CORDIC II: A New Improved CORDIC Algorithm8. Low-Power Parallel Chien Search Architecture Using a Two-Step Approach9. Efficient Circuit for Parallel Bit Reversal .10. High-Speed and Energy-Efficient Carry Skip Adder Operating Under a Wide Range of Supply Voltage Levels11. Low-Cost High-Performance VLSI Architecture for Montgomery Modular Multiplication12. A High-Performance FIR Filter Architecture for Fixed and Reconfigurable Applications13. Efficient Dynamic Virtual Channel Organization and Architecture for NoC Systems14. Improving Nested Loop Pipelining on Coarse-Grained Reconfigurable Architectures15. One-Cycle Correction of Timing Errors in Pipelines With Standard Clocked Elements 16. Analytical SPICE-Compatible Model of Schottky-Barrier-Type GNRFETs With Performance Analysis17. A New Optimal Algorithm for Energy Saving in Embedded System With Multiple Sleep Modes18. A Novel Quantum-Dot Cellular Automata X-bit × 32-bit SRAM19. Input-Based Dynamic Reconfiguration of Approximate Arithmetic Units for Video Encoding20. Ultralow-Energy Variation-Aware Design: Adder Architecture Study21. SRAM-Based Unique Chip Identifier Techniques .22. Implementing Minimum-Energy-Point Systems With Adaptive Logic23. On Efficient Retiming of Fixed-Point Circuits24. Hardware and Energy-Efficient Stochastic LU Decomposition Scheme for MIMO Receivers25. Distributed Sensor Network-on-Chip for Performance Optimization of Soft-Error-Tolerant Multiprocessor System-on-Chip26. Concept, Design, and Implementation of Reconfigurable CORDIC27. A New CDMA Encoding/Decoding Method for on-Chip Communication Network
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IEEE 2016 - 2017 VLSI Project Titles 1. Analyzing the Effect of Clock Jitter on Self-Oscillating Sigma Delta Modulators2. Hypergraph Based Minimum Arborescence Algorithm for the Optimization and Reoptimization of Multiple Constant Multiplications.3. A High-Throughput Energy-Efficient Implementation of Successive Cancellation Decoder for Polar Codes Using Combinational Logic4. Adaptive Multibit Crosstalk-Aware Error Control Coding Scheme for On-Chip Communication5. A Method to Design Single Error Correction Codes With Fast Decoding for a Subset of Critical Bits6. Multiple Constant Multiplication Algorithm for High-Speed and Low-Power Design7. CORDIC II: A New Improved CORDIC Algorithm8. Low-Power Parallel Chien Search Architecture Using a Two-Step Approach9. Efficient Circuit for Parallel Bit Reversal .10. High-Speed and Energy-Efficient Carry Skip Adder Operating Under a Wide Range of Supply Voltage Levels11. Low-Cost High-Performance VLSI Architecture for Montgomery Modular Multiplication12. A High-Performance FIR Filter Architecture for Fixed and Reconfigurable Applications13. Efficient Dynamic Virtual Channel Organization and Architecture for NoC Systems14. Improving Nested Loop Pipelining on Coarse-Grained Reconfigurable Architectures15. One-Cycle Correction of Timing Errors in Pipelines With Standard Clocked Elements 16. Analytical SPICE-Compatible Model of Schottky-Barrier-Type GNRFETs With Performance Analysis17. A New Optimal Algorithm for Energy Saving in Embedded System With Multiple Sleep Modes18. A Novel Quantum-Dot Cellular Automata X-bit × 32-bit SRAM19. Input-Based Dynamic Reconfiguration of Approximate Arithmetic Units for Video Encoding20. Ultralow-Energy Variation-Aware Design: Adder Architecture Study21. SRAM-Based Unique Chip Identifier Techniques .22. Implementing Minimum-Energy-Point Systems With Adaptive Logic23. On Efficient Retiming of Fixed-Point Circuits24. Hardware and Energy-Efficient Stochastic LU Decomposition Scheme for MIMO Receivers25. Distributed Sensor Network-on-Chip for Performance Optimization of Soft-Error-Tolerant Multiprocessor System-on-Chip26. Concept, Design, and Implementation of Reconfigurable CORDIC27. A New CDMA Encoding/Decoding Method for on-Chip Communication Network
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VLSI PROJECTS ABSTRACT 2016 -2017LOW-POWER SYSTEMS FOR DETECTION OF SYMPTOMATIC PATTERNS IN AUDIO BIOLOGICAL SIGNALSABSTRACT: In this paper, we present a low-power, efficacious, and scalable system for the detection of symptomatic patterns in biological audio signals. The digital audio recordings of various symptoms, such as cough, sneeze, and so on, are spectrally analyzed using a discrete wavelet transform. Subsequently, we use simple mathematical metrics, such as energy, quasi-average, and coastline parameter for various wavelet coefficients of interest depending on the type of pattern to be detected. Furthermore, a mel-frequency cepstrum-based analysis is applied to distinguish between signals, such as cough and sneeze, which have a similar frequency response and, hence, occur in common wavelet coefficients. Algorithm-circuit codesign methodology is utilized in order to optimize the system at algorithm and circuit levels of design abstraction. This helps in implementing a low-power system as well as maintaining the efficacy of detection. The system is scalable in terms of user specificity as well as the type of signal to be analyzed for an audio symptomatic pattern. We utilize multiplierless implementation circuit strategies and the algorithmic modification of mel cepstrum computation to implement low power system in the 65-nm bulk Si technology. It is observed that the pattern detection system achieves about 90% correct classification of five types of audio health symptoms. We also scale the supply voltage due to lower frequency of operation and report a total power consumption of ~184 µW at 700 mV supply.
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VLSI PROJECTS ABSTRACT 2016 -2017A LOW-COST RADIATION-HARDENED METHOD FOR PIPELINE PROTECTION IN MICROPROCESSORSABSTRACT: The aggressive scaling of semiconductor technology has significantly increased the radiation-induced soft-error rate in modern microprocessors. Meanwhile, due to the increasing complexity of modern processor pipelines and the limited error-tolerance capabilities that previous radiation hardening techniques can provide, the existing pipeline protection mechanisms cannot achieve complete protection. This paper proposes a complete and cost-effective pipeline protection mechanism using a self-checking architecture. The radiation-hardened pipeline is achieved by incorporating soft-error- and timing-error-tolerant flip-flop (SETTOFF)-based self-checking cells into the sequential cells of the pipeline. A replay recovery mechanism is also developed at the architectural level to recover the detected errors. The proposed pipeline protection technique is implemented in an Open RISC microprocessor in a 65-nm technology. A gate-level transient fault-injection and analysis technique is used to evaluate the error-tolerance capability of the proposed hardened pipeline design. The results show that compared with the techniques such as triple modular redundancy, the SETTOFF-based self-checking technique requires over 30% less area and 80% less power overheads. Meanwhile, the error-tolerant and self-checking capabilities of the register allow the proposed pipeline protection technique to provide a noticeably higher level of reliability for different parts of the pipeline compared with the previous pipeline protection techniques.
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VLSI PROJECTS ABSTRACT 2016-2017 HIGH-SPEED AND ENERGY-EFFICIENT CARRY SKIP ADDER OPERATING UNDER A WIDE RANGE OF SUPPLY VOLTAGE LEVELS ABSTRACT: In this paper, we present a carry skip adder (CSKA) structure that has a higher speed yet lower energy consumption compared with the conventional one. The speed enhancement is achieved by applying concatenation and incrementation schemes to improve the efficiency of the conventional CSKA (Conv-CSKA) structure. In addition, instead of utilizing multiplexer logic, the proposed structure makes use of AND-OR-Invert (AOI) and OR-AND-Invert (OAI) compound gates for the skip logic. The structure may be realized with both fixed stage size and variable stage size styles, wherein the latter further improves the speed and energy parameters of the adder. Finally, a hybrid variable latency extension of the proposed structure, which lowers the power consumption without considerably impacting the speed, is presented. This extension utilizes a modified parallel structure for increasing the slack time, and hence, enabling further voltage reduction. The proposed structures are assessed by comparing their speed, power, and energy parameters with those of other adders using a 45-nm static CMOS technology for a wide range of supply voltages. The results that are obtained using HSPICE simulations reveal, on average, 44% and 38% improvements in the delay and energy, respectively, compared with those of the Conv-CSKA. In addition, the power–delay product was the lowest among the structures considered in this paper, while its energy–delay product was almost the same as that of the Kogge–Stone parallel prefix adder with considerably smaller area and power consumption. Simulations on the proposed hybrid variable latency CSKA reveal reduction in the power consumption compared with the latest works in this field while having a reasonably high speed.
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