Saurabh Chaudhury

National Institute of Technology, Silchar | NIT Silchar · Department of Electrical Engineering

Multilevel thresholding is widely used in brain magnetic resonance (MR) image segmentation. In this article, a multilevel thresholding-based brain MR image segmentation technique is proposed. The image is first filtered using anisotropic diffusion. Then multilevel thresholding based on particle swarm optimization (PSO) is performed on the filtered...

This paper presents classification of five different types of milled rice grain using various texture feature extraction models. Four different gray level based texture features extraction techniques are discussed in this work. The classification task is performed using an adaptive threshold back propagation neural network. The above four texture f...

On pure and metal, non-metal, co-doped rutile TiO2, DFT simula- tions are performed. For the stability study of doped materials, the defect formation energies of non-metal (S), metal (Fe), and metal and non-metal (Fe/S) co-doped materials are determined. A Ti- rich environment is preferable over an O-rich environment. With values of 2.98 eV, 2.18 e...

Enhancing solar cell efficiency is one of the most challenging and demanding topics for PV researchers. An ab initio study is done here on the structure of crystal, formation energies, electronic structure, the density of states, effective mass, and optical properties of pure and S-doped, Fe-doped, and Fe-/S-doped anatase TiO2. Co-doping causes a s...

Structural, electronic, and optical properties of ferroelectric material, Lithium niobate (LiNbO 3 ) are explored and studied using two different techniques namely, OLCAO-MGGA-TB09+c and OLCAO-GGA-PBES + U under the framework of density functional theory (DFT). The electronic properties such as band diagram, the effective mass of charge carriers, t...

In this paper, a novel method is proposed for the first time to achieve multiple threshold voltage (V T) for Silicon Nanotube FET. Using TCAD simulator, it is shown that threshold voltage can be varied by tuning the halo doping and tube diameter of Silicon Nanotube FET. The typical method to attain multiple threshold voltages is to select the perti...

In this work, the impact of interface trap charges (ITCs) on electrical characteristics of dielectric pocket SOI-TFET (DP SOI-TFET) proposed for the reduction of ambipolar conduction and improvement of high-frequency (HF) performances has been demonstrated in details. The reliability of DP SOI-TFET has been examined by analysing the impact of varyi...

For computational arithmetic, a full adder is the primary logic units in VLSI applications. A new full adder circuit design has been presented in this article which is based on input switching activity pattern and gate diffusion input (GDI) technique. The adder has been designed in two stages. The first stage is an XOR–XNOR module, whereas, the fin...

span>A multiplier circuit is one of the most important functional blocks of many nano-electronic, control and automation applications. In this work, an energy-efficient multiplier is reported based on a 3:2 compressor. The multiplier has been designed in three different parts. In the first part, a partial product (PP) generator is used. In the seco...

In this paper, we focus on the improvement of comprehensive device performance of Silicon Nanotube Tunnel Field Effect Transistor (NT_TFET) for ultra low power applications. In the design we have implanted 2nm Halo region at the source side of Si NT_TFET for improving the subthreshold swing and short channel effects (SCEs). To prove the concept, th...

A split gated silicon nanotube field-effect transistor (FET) biosensor has been proposed for the label free detection of the biomolecules for the first time in literature. The sensitivity of the sensing device has been analysed considering the on current (I ON) and the threshold voltage (V th) variation. Sub-threshold regime has been considered her...

In this work we have studied the impact of variation of k dielectric constant on Silicon Nano Tube FET for low power and high speed applications. The Silicon Nano tubular structure offers better immunity towards short channel effects (SCE's) because of the better control of channel region due to the double gate all around. By cause of gate engineer...

Multilevel thresholding is a widely used image segmentation technique. However, multilevel thresholding becomes more and more computationally expensive as the number of thresholds increase. Therefore, it is essential to incorporate some suitable optimization technique to make it practical. In this article, a modification is proposed to the Moth-Fla...

In this paper, a detailed study and analysis on the electronic and optical properties of anatase, rutile and brookite titanium dioxide (TiO2) which are the naturally occurring phases of TiO2 have been carried out. We have obtained these properties using the self-consistent orthogonalized linear combination of atomic orbitals with meta-generalized g...

In this paper we studied the impact of variation of dielectric constant and alternation of gate work function on silicon nanotube FET for low power and high speed switching applications. The silicon nano tubular structure offers better immunity towards short channel effects. Due to the gate engineered structure high K value structures possess high...

Classifications of eight different varieties of rice grain are discussed in this study based on various texture models. Four local texture feature extraction techniques are proposed and three sets of texture features (SET‐A, SET‐B and SET‐C) are formed, for the classification task. Performances of the proposed feature sets are compared with the exi...

The compressor is a useful element that is widely used in VLSI circuits and systems. It is generally used as a processing element. In this work, a 4-2 compressor has been designed with XOR-XNOR module and multiplexer module. The XOR-XNOR module is consists of six transistors and the multiplexer is consists of transmission gate. The compressor has b...

In this paper, a Self-consistent Orthogonalized linear combination of atomic orbitals (OLCAO) technique with a generalized gradient approximation such as Perdew–Burke–Ernzerhof Solid (GGA-PBE SOL) has been used to scrutinize the structural, optical, electronic and mechanical properties of normal pressure phase (Anatase and Rutile) and high pressure...

In this manuscript, the impact of dielectric pocket on analog/radio-frequency (RF) performances of SOI TFET is investigated. The inclusion of a dielectric pocket to SOI-TFET has been found to have great potential in eliminating the ambipolarity when Tunnel FET is biased at a higher negative gate voltage. With 2-D numerical simulations, it is demons...

This paper deals with the classification of eight types of rice grain using image processing and neural network. Three different texture feature extraction schemes based on co-occurrence matrix, run length matrix and wavelet decomposition were considered. The contribution of these texture feature extraction techniques towards rice grain classificat...

To remove simultaneously the ambipolar conduction and enhance HF performances, we propose a promising configuration of DG-TFET with asymmetric gate–drain overlap (ASGDO DG-TFET) in which only back gate is overlapped with drain region. This proposed structure of DG-TFET removes the trade-off between ambipolarity and HF performances by taking the mer...

This paper describes the classification of four different varieties of rice grain based on four sets of features, namely morphology, colour, texture and wavelet. The classification is carried out on single rice kernel using image pre-processing steps followed by a cascade network classifier. The performance of the classifiers based on the above fea...

Carbon nanotubes (CNT) field-effect transistor (CNTFET) could be a possible alternative to CMOS technology for future VLSI applications. In this work, a comparative study has been carried out on the effects of technology nodes and logic styles on power dissipation, delay, leakages, etc. The technology nodes that are considered here are 90 nm and 32...

A new multilevel thresholding based image segmentation technique is developed which utilizes Masi entropy as an objective function. Thresholding is an important image segmentation technique. It may be divided into two types such as bi-level and multilevel thresholding. Bi-level thresholding uses a single threshold to classify an image into two clas...

A new tubular FET device named Silicon Nano Tube Tunnel Field Effect Transistor (Si-NTTFET), has been proposed which is emerged out of structural engineering and the gate dielectric engineering. The proposed structure offers better immunity towards short channel effects (SCE’s) because of the combined effect of minimal doping at the drain side and...

In the presented work, a Tunnel FET device with dual-metal graded-channel structure is proposed and investigated showing the influence of energy band modulation at channel-drain interface on the ambipolar conduction. Through two-dimensional numerical simulations, it is demonstrated that a heavily-doped channel region adjacent to drain terminal alon...

Multilevel thresholding is widely used in brain magnetic resonance (MR) image segmentation. In this article, a multilevel thresholding-based brain MR image segmentation technique is proposed. The image is first filtered using anisotropic diffusion. Then multilevel thresholding based on particle swarm optimization (PSO) is performed on the filtered...

Compressor is a useful element that is widely used in VLSI circuits and systems. It is generally used as a processing element. In this work, a 4-2 compressor has been designed with XOR-XNOR module and multiplexer module. The XOR-XNOR module is consists of 6 transistors and the multiplexer is consists of transmission gate. The compressor has been de...

This paper investigates on the structural stability and electronic properties of titanium dioxide (TiO 2) nanowires of different novel shapes using first-principle based density functional approach. Out of linear, ladder, saw tooth, square, triangular, hexagonal, and octahedron shaped atomic configuration, the ladder shape atomic configuration is e...

In this brief, the reliability of SOI-TFET with dielectric pocket (DP SOI-TFET) has been investigated in the presence of fixed trap charges at the interface between dielectric pocket (DP) and drain region. During numerical simulation, both types of trap charges like donor (i.e. positive) and acceptor (i.e. negative) have been considered to analyse...

This paper investigates on the structural stability and electronic properties of titanium dioxide (TiO2) nanowires of different shapes using first- principle based density functional approach. Out of linear, ladder, and saw tooth shaped atomic configuration, the ladder shape atomic configuration is energetically most stable. After computation of la...

A multiplier is of the most important blocks of many VLSI application. So, it is required to design high performance multiplier to boost up the performance of those circuits and systems. In this work, a high performing Multiplier has been designed by using the Wallace tree algorithm. The multiplier has been designed in three modules. Initially, par...

In this brief, we have investigated a novel structure of double-gate TFET with extended back gate (EBG-DG-TFET) to improve the device performances. In the proposed device, the extended back gate is found to create an overlapped region with both source side as well as drain side which improves the overall performances of DG-TFET. Through two-dimensi...

Background: The Adder is one of the most prominent building blocks in VLSI circuits and systems. Performance of such systems depends mostly on the performance of the adder cell. The scaling down of devices has been the driving force in technological advances. However, in CMOS technology performance of adder cell decreases as the technology node sca...

The impact of high-k dielectric pocket (DP) on the ambipolar conduction of tunnel field-effect transistors (TFETs) is demonstrated using two-dimensional Technology Computer Aided Design (TCAD) simulations. In the proposed structure of TFETs, an optimised portion of the upper drain region is replaced with a high-k DP at the channel-drain interface....

In this paper, we have presented an analysis on the performance of a strained silicon channel in Silicon Nanotube FET device. Silicon Nanotube FET devices have tube-shaped channel region and because of this conduction in the channel can be controlled in two ways from outside the tube and from inside (from hollow side) the tube which results in a be...

This paper proposed an underlap double-gate MOSFET (U-DG MOSFET) structure with gate stacking. Better sub-threshold slope and RF performance can be obtained from DG MOSFET with symmetrical/asymmetrical drain-source configuration. Simulation shows better results for its upgraded resilient against short channel effects (SCE). The analog and RF perfor...

This paper presents an analysis on electronic, mechanical and optical properties of cubic titanium dioxide using Orthogonalized Linear Combinations of Atomic Orbitals (OLCAO) basis set under the framework of Density Functional Theory. The structural property, namely lattice constant ‘a’, and the electronic properties such as, the band diagram, dens...

With the advancement in CMOS technology, process related limitations, power dissipation, leakage etc. are main challenges for VLSI. So, in the field of VLSI an alternative device technology is the need of the time. Many new next generation devices have come up very recently, especially, the Carbon Nanotubes (CN)Field Effect Transistor (CNTFET)which...

An effective way to get multiple threshold voltage modulation schemes in Silicon nano tube FET combining unbalanced halo doping is proposed and verified by 3D TCAD Simulator. The typical choice to accomplish multiple threshold voltages is by choosing the appropriate gate work-function for each device. But this results in higher process complexity....

Purpose The purpose of this paper is to analyze various properties of anatase titanium dioxide (TiO2) nanoparticles. Further, it proposes to implement Linear Combinations of Atomic Orbitals (LCAO) basis set under the framework of density functional theory and outline how LCAO is able to provide improved results in terms of various mechanical prope...

This paper presents an analysis of optical properties of cubic titanium dioxide (TiO2) using Orthogonalized Linear Combinations of Atomic Orbitals (OLCAO) basis set under the framework of Density Functional Theory (DFT). Many optical properties such as refractive index, extinction coefficient, reflectivity, absorption coefficient, photoconductivity...

In this paper, a novel structure of cylindrical GAA-TFETs with high-k dielectric pocket is proposed to improve the analog and high frequency performances. We have discussed the device physics of proposed structure in details with the help of 3-D TCAD simulation. Since, an optimum part of the drain region is replaced with a high-k dielectric materia...

We present an analysis of structural, electronic, and mechanical properties of cubic titanium dioxide (TiO 2) using an all electron orthogonalzed linear combinations of atomic orbitals (OLCAO) basis set under the framework of density functional theory (DFT). The structural property, especially the lattice constant a, and the electronic properties s...

Adders are an integral part of arithmetic logic units in the digital system. Performance of the adder circuits decides the performance of those circuit and systems. Full adders are designed either in a conventional approach or hybrid approach. In the conventional approach, only one logic style is used, whereas, in a hybrid approach, two or more log...

Multilevel thresholding is a popular image segmentation technique. However, computational complexity of multilevel thresholding increases very rapidly with increasing number of thresholds. Metaheuristic algorithms are applied to reduce computational complexity of multilevel thresholding. A new method of multilevel thresholding based on Moth-Flame O...

A Density Functional Theory based Analysis on the Structural, Electronic, and Mechanical Properties of Cubic TiO2

This paper presents an analysis of structural and optical properties of cubic titanium dioxide (TiO2) using Orthogonalzed Linear Combinations of Atomic Orbitals (OLCAO) basis set under the framework of Density Functional Theory (DFT). The structural property, specially the lattice constant 'a' and the optical properties such as refractive index, ex...

Multilevel thresholding is a popular image segmentation technique. However, computational complexity of multilevel thresholding increases very rapidly with increasing number of thresholds. Metaheuristic algorithms are applied to reduce computational complexity of multilevel thresholding. A new method of multilevel thresholding based on Moth-Flame O...

Leakage power dissipation is the dominant contributor of total power dissipation in nanoscale complementary metal oxide semiconductor (CMOS) integrated circuits. CMOS technology scaling demands for a reduced power supply, low threshold voltage, high transistor density and reduced oxide thickness, which has led to significant increase in leakage pow...

A novel 9T-SRAM architecture is proposed in this paper. It smartly integrates the source biasing and body-bias control schemes in designing an SRAM cell. The proposed cell consists of nine transistors with separate read/write ports. It uses a read word-line based body bias controller and two tail transistors in pull-down path to improve the design...

Leakage power dissipation is a serious concern in deep nanometer devices. Low power design methodology is often adopted in VLSI circuits and systems to minimize power; however, this is achieved at the cost of performance penalty. In this paper, we first review the existing circuit techniques for leakage minimization. A new circuit technique is then...

A dynamic threshold voltage control strategy is presented in this paper to minimize leakage power while enhancing the speed and stability. The threshold voltage of driver and access transistor are tuned dynamically through a novel body-bias controller circuit. The word line signal level controls the action of the proposed body-bias controller. In o...

In literature, oriented filters are used for low-level vision tasks. In this paper, we propose use of steerable Gaussian filter in image quality assessment. Human visual system is more sensitive to multidirectional edges present in natural images. The most degradation in image quality is caused due to its edges. In this work, an edge based metric t...