Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

In the multistage bidirectional networks, the same node is accessed multiple times in the same time slot resulting in contention. In this article, we experimentally demonstrate the contention resolution with minimum electronics. This is verified in the experimental testbed and the data is switched from one node to other node without contention. The results are verified in terms of eye diagram in both the directions. © 2019 Wiley Periodicals, Inc.

VIT Unitversity

Department of Automotive Engineering

School of Mechanical Engineering

Vellore Campus

Electronics

School of Electronics Engineering

Chennai Campus

Microwave and Optical Technology Letters

Hardware implementation of contention aware optical switching node for data center networks

This paper deals with the design of various LC oscillators around 25 GHz which can be used for millimeter wave CMOS radios. Cross coupling is a standard technique used in oscillators and the losses in an LC tank is replenished by the negative resistance of the cross coupled circuit. This paper utilizes cross coupling technique to design oscillators centred around 25 GHz. Four topologies of oscillators are designed in 90nm CMOS technology with a peak to peak output swing of 800mV from a 1.2V supply. The design uses a non ideal inductor modeled with parasitic elements. The simulated phase noise results with the non ideal inductor is around - 97 dBc / Hz at an offset of 1 MHz and the total power consumption is around 60 μW. © 2019 IEEE.

World University root node

Department of Micro and Nanoelectronics

2019 International Conference on Communication and Signal Processing (ICCSP)

Design of Millimeter Wave LC Oscillators for 5G Applications

With the evolution of CMOS technology, scaling continues to play an important role. This requires the transistor to operate at low supply voltages. However, the threshold voltages do not decrease at the same rate as the supply voltage VDD, resulting in reduced output swing. Besides, the second order effects will be more predominant with scaling. In addition, the intrinsic gain available from the transistors is lessening. This trend makes the traditional techniques, like cascoding and gain boosting, unproductive for achieving high DC gain in nano-scale CMOS processes. Consequently, horizontal cascading multi-stage must be used in order to realize high-gain op-amps in low-VDDprocesses. One major hardship in doing so is the trade-off between gain and stability. With multi-staging, gain increases at the cost of stability of the system. In order to achieve better stability, there is a need for op-amp compensation. This paper presents the design of op-amp using split-length compensation and compares its performance with Miller compensation. The gm/ID methodology is used for the design purpose which includes the second order effects of the transistors. The designed circuit is simulated in Cadence Virtuoso schematic editor using 180 nm CMOS technology. The results of Split length technique show an improvement of 18.2% in gain and 37.5% in phase margin with a significant reduction in the area along with an increase in the speed of the circuit as compared to the Miller Compensation technique. © 2018 IEEE.

2018 International Conference on Communication and Signal Processing (ICCSP)

Systematic Design and Analysis of Split Length Compensated Op-Amp Using gm/ID Technique

More than fifty percent Indian population do not have access to electricity in daily lives. The distance between the power generating stations and the distribution centers forms one of the main reasons for lack of electrification in rural and remote areas. Here lies the importance of decentralization of power generation through renewable energy resources. In the present world, electricity is predominantly powered by alternating current, but most day to day devices like LED lamps, computers and electrical vehicles, all run on DC power. By directly supplying DC to these loads, the number of power conversion stages was reduced, and overall system efficiency increases. Replacing existing AC network with DC is a humongous task, but with power electronic techniques, this project intends to implement DC grid at a household level in remote and rural areas. Proposed work was designed and simulated successfully for various loads amounting to 250 W through appropriate power electronic convertors. Maximum utilization of the renewable sources for domestic and commercial application was achieved with the proposed DC topology. © Published under licence by IOP Publishing Ltd.

Department of Energy and Power Electronics

School of Electrical Engineering

Department of Database Systems

School of Computer Science and Engineering

Fulltext

IOP Conference Series: Materials Science and Engineering

DC grid for home applications

A needle-free vaccine/drug injector that works by virtue of the impulse of a moving shock wave is presented in this communication. The device can deliver controlled micro-volumes of liquid vaccines into skin and soft tissue targets in human with minimal invasion. The operation of the injector was investigated by delivering a dyed liquid into human skin samples and soft tissue models. The depth of penetration of the liquid was examined by histology of the targeted human skin samples. The delivery mechanics and the depth of penetration were analyzed theoretically with an elastic model for the skin and a viscoelastic model for the soft tissue targets, and a good agreement with experiments was observed. The current liquid vaccine/drug delivery technique can reduce pain, trauma and contamination, and can offer a cost-effective, needle-free, health-care solution. © 2017 - IOS Press and the authors. All rights reserved.

Technology and Health Care

Impulse-powered needle-free syringe for vaccine/drug injection

Advances in Intelligent Systems and Computing Artificial Intelligence and Evolutionary Computations in Engineering Systems

Prediction of Mechanical Soil Properties Based on Experimental and Computational Model of a Rocker Bogie Rover

This article presents a miniature shock wave driven micro-jet generator to deliver liquid drugs into human skin, to a controlled depth, with minimal invasion. The device can release the vaccine/drug to the depth of dermal blood vessels, without breaching much of the microcirculation system of dermis. The drug delivery technique is needle-free, which can reduce pain, trauma, and contamination besides minimal dosage and systemic exposure. The device can also be used to deliver liquid or colloidal drugs into soft tissues in human. The mechanical analyses of the device were carried out by analyzing the strength of the impulse of the shock wave, measuring the velocity of the generated jet and capturing the pressure exerted by the jet on the target. The penetrating ability of the jet was investigated by delivering it into sample of human skin and gelatin slabs. Theoretical analyses were carried out on the physics of the delivery and the predicted results had a close agreement with the experimental observations. The development can offer an important cost-effective solution to needle-free health care worldwide. Biotechnol. Bioeng. 2016;113: 2507–2512. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

Biotechnology and Bioengineering

A miniature shock wave driven micro-jet injector for needle-free vaccine/drug delivery

The Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT) play a vital role in signal processing. It is often used in many communication systems. This paper realize a 16-bit FFT architecture using radix-4 algorithm. The radix-4 structure can be used when the length of the signal is in the powers of 4. The two main challenges of this work is the complex arithmetic operations, floating point addition and multiplication operations. As we require floating point operations we went for floating point adders and multipliers. The complex multiplier is the most power consuming block in the FFT processor. The proposed Radix-4 FFT processor is realized on Verilog platform using vertex FPGA. © 2015 IEEE.

2015 Online International Conference on Green Engineering and Technologies (IC-GET)

Implementation of radix-4 butterfly structure to prevent arithmetic overflow

Abstract: This article presents an investigation on a correlation relevant to flow separation during shock wave–boundary layer interaction in a hypersonic flow. The study includes experimental as well as numerical components. The hypersonic shock–boundary layer interactions were visualized to gauge the extent of flow separation on a flat plate on external shock impingement. The pressure in the vicinity of shock impingement was measured. Through visualized images, the applicability of the correlation to flow separation due to externally impinged shock waves was analyzed. Qualitative numerical simulations were carried out to have an insight into the hypersonic shock–boundary layer interactions. Graphical abstract: [Figure not available: see fulltext.] © 2015, The Visualization Society of Japan.