A5051965447- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Innovative Energy Harvesting Technologies
- Chalcogenide Semiconductor Thin Films
- Acoustic Wave Resonator Technologies
- Refrigeration and Air Conditioning Technologies
- Neuroscience and Neural Engineering
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Memory and Neural Computing
- Physical Unclonable Functions (PUFs) and Hardware Security
- solar cell performance optimization
- Wireless Body Area Networks
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Photovoltaic System Optimization Techniques
- Advanced Sensor Technologies Research
- Solar Radiation and Photovoltaics
- ZnO doping and properties
- Radio Frequency Integrated Circuit Design
- Molecular Communication and Nanonetworks
- Analog and Mixed-Signal Circuit Design
- Advanced MEMS and NEMS Technologies
- VLSI and Analog Circuit Testing
- Silicon Carbide Semiconductor Technologies
- Silicon and Solar Cell Technologies
Northeastern University
2020-2025
Austrian Institute of Technology
2015-2024
Boston University
2021-2023
University of Vienna
2015-2022
Delhi Technological University
2020-2021
Eindhoven University of Technology
2014-2020
ABES Engineering College
2019
National Institute of Technology Kurukshetra
2018
Birla Institute of Technology and Science, Pilani - Goa Campus
2016
Indian Institute of Space Science and Technology
2014
Abstract Ultra-compact wireless implantable medical devices are in great demand for healthcare applications, particular neural recording and stimulation. Current technologies based on miniaturized micro-coils suffer from low power transfer efficiency (PTE) not always compliant with the specific absorption rate imposed by Federal Communications Commission. Moreover, current reliant differential of voltage or across space require direct contact between electrode tissue. Here, we show an...
This paper reviews and analyses the design of popular radio frequency energy harvesting systems proposes a method to qualitatively quantitatively analyze their circuit architectures using new square-wave approximation method. approach helps in simplifying analysis. Using this analysis, we can establish no load output voltage characteristics, upper limit on rectifier efficiency, maximum power characteristics rectifier. will help guide RF circuits for identification (RFIDs), Internet Things...
The induced voltage, apart from being a concern for human safety, also becomes the continuous operation of plants, where electrical equipment is connected via numerous wires and cables control purposes. voltage beyond permissible limits may intervene with proper functioning signalling controlling devices plant result in unscheduled interruptions. It well-known phenomenon electromagnetism, that when static conductor situated within changing magnetic field or moves field, thus, inevitable...
A magnetoelectric antenna (ME) can exhibit the dual capabilities of wireless energy harvesting and sensing at different frequencies. In this article, a behavioral circuit model for hybrid ME antennas is described to emulate radio frequency (RF) operations during simulations. The work interfaced with CMOS harvester chip towards goal developing communication link fully integrated implantable devices. One role system receive pulse-modulated power from nearby transmitter, another sense transmit...
This paper presents a fully integrated RF energy harvester (EH) with 30% end-to-end power harvesting efficiency (PHE) and supports high output voltage operation, up to 9.3V, 1.07 GHz input under the electrode model for neural applications. The EH is composed of novel 10-stage self-biased gate (SBG) rectifier an on-chip matching network. SBG topology elevates gate-bias transistors in non-linear manner enable higher conductivity. design also achieves >20% PHE range 12-dB. was fabricated 65 nm...
This paper presents a new technique of radio frequency (RF) signal strength detection with received indicator (RSSI) circuit which can be deployed in an internet-of-things (IoT) network. The proposed RSSI is based on direct conversion RF to digital code indicating the strength. achieved by repeated switching rectifier's output voltage using ultra-low power comparator. A 5-bit programmable feedback used correct inaccuracies. implemented 65-nm CMOS process and consumes 6nW power. It has linear...
In this endeavor, the transients persisting in a vacuum ejector system are studied by numerically simulating flowfield and experimentally validating steady-state results. An inertial effect is discovered study due to recirculation zone moving forward backward during transients, subsequently pressure secondary chamber oscillates. The flow exhibits damped oscillations which direction of mass flux through keeps changing finally settles down state there no into or from chamber. It seen that...
This paper introduces a behavioral circuit model for magnetoelectric (ME) antenna, which is novel miniaturized device with applications in low-power sensing. To facilitate the design of integrated circuits interfaced to its accounts amplitude modulation behavior observed during measurements nanoelectromechanical system (NEMS) when subjected an AC magnetic field and DC biasing field. We propose dynamic transient simulations, show that characteristics match experimentally obtained ME antenna....
Cognitive communication utilizes transient openings in the spectrum to communicate opportunistically, which is a promising technique enable more efficient usage an increasingly congested environment. We aim address two main challenges associated with cognitive communication: (i) sensing should be fast and energy for processing large bandwidth short time; (ii) approach able simultaneously recognize multiple signals that are present. In this paper, we propose these novel design framework...
This article describes the development of a radio frequency (RF) platform for electromagnetically modulated signals that makes use software-defined (SDR) to receive information from novel magnetoelectric (ME) antenna capable sensing low-frequency magnetic fields with ultra-low magnitudes. The is employed as part research and utilize miniaturized ME antennas integrated circuits neural recording wireless implantable devices. To prototype reception sensor, versatile Universal Software Radio...
This paper presents an ultra-low power received signal strength indicator (RSSI) circuit to detect constant jamming attacks in the internet-of-things (IoT) network. The proposed RSSI uses a passive rectifier convert incoming radio frequency (RF) DC level. A set of cascaded differential amplifier stages then generate is implemented commercial 65-nm CMOS process and consumes 25nW. It has detection sensitivity −70dBm dynamic range 48dB with ±1dB accuracy. Simulation results shows its robustness...
Abstract Ultra-compact wireless implantable medical devices (IMDs) are in great demand for healthcare applications, particular neural recording and stimulation. Current technologies based on miniaturized micro-coils suffer from low power transfer efficiency (PTE) not always compliant with the specific absorption rate imposed by Federal Communications Commission, particularly deep brain implantation where field attenuation tissue loss significant. Moreover, current reliant recordings of...
Aluminium-doped zinc oxide (ZnO:Al) grown by expanding thermal plasma chemical vapour deposition (ETP-CVD) has demonstrated excellent electrical and optical properties, which make it an attractive candidate as a transparent conductive for photovoltaic applications. However, when depositing ZnO:Al on CIGS solar cell stacks, one should be aware that high substrate temperature processing (i.e., >200°C) can damage the crucial underlying layers/interfaces (such CIGS/CdS CdS/i-ZnO). In this...
This paper proposes new positive feedback source coupled logic (PFSCL) tristate buffers suited to bus applications. The proposed use switch attain high impedance state and modify the load or current section. An interesting consequence of this is overall reduction in power consumption. consume half compared available based counterpart. issues with PFSCL implementation are identified benefits employing buffer topologies put forward. SPICE simulation results using TSMC 180 nm CMOS technology...
Enabling Internet of Things (IoT) in harsh environments relies on improving battery life, which can be achieved using Wake-Up Receivers (WuRX) with high quality factor (Q) RF components. MEMS micro-acoustic resonators have been proposed as strategic components to provide large passive voltage amplification well noise and interference rejection, ultimately providing means reduce system-level link budget power-hungry cells count the back-end circuitry. In this work, we present an integration...
This article presents large delay-based analog Trojan circuits, a new class of Trojans that can be interfaced with digital and macros to launch fabrication-time hardware attacks. Two different circuit topologies are presented, which generate delayed trigger output after two days 60 ms, respectively, when implemented in 65-nm CMOS technology. The delay is achieved using the transistor's gate-oxide leakage current or diode's reverse saturation combination Miller capacitance-based circuits....
In this work, we propose a passive radio frequency (RF) front-end tailored for wake-up receivers (WuRx) to be deployed in cellular Internet of Things (IoT) devices and wearables networks, featuring low radiation resistance antenna high- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> matching network implemented with microacoustic resonators integrated obtain systematic...
This paper describes new sleep-based positive feedback source-coupled logic (PFSCL) tri-state inverter/buffer topologies. The behavior is obtained by disconnecting the circuit from both power supply and ground. achieved placing additional transistors, driving load transistor to cut off or disabling current source. combination of three methods results in six functionality performance proposed topologies studied through SPICE simulations. A comparison with available PFSCL buffer shows a...