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An integrated reset controller (voltage supervisor) is designed and implemented. The system generates a reset signal, active while power supply brownout conditions are detected and for 250 ms after the supply voltage has increased to acceptable levels. The circuit is built in a Deep N-Well (DNW) 5V 0.35μm CMOS process, which provides good isolation between the on-chip devices and the substrate. The...
Last decade witness massive developments for wireless communication networks based on Internet of Things (IoT) technology. These developments indeed aim to enable efficient interconnectivity between different devices with the ability to operate in license-free ISM bands. Currently, several applications are based on IoT technology such as home automation, energy harvesting … etc. To enhance and improve...
Titanium dioxide powders were obtained by the homogeneous precipitation technique by using two different titanium precursors, namely, titanium (IV) butoxide and titanium (IV) isopropoxide. The solution was prepared by mixing the Ti precursors in methanol, after that, acetic and sulfuric acid were slowly added. The solution was kept under constant magnetic stirring until obtaining a white precipitate...
This paper proposes a multiple predictive control strategy in order to control a combination of substrate concentrations inside of an anaerobic digestion process of microalgae. Based on the linear approximation of the original nonlinear model, an optimal control algorithm was developed and tested by simulation experiments. The obtained results validate the effectiveness and robustness of the proposed...
In this study, the influence of a temperature annealing process on the crystallographic orientation and sheet resistance of Pt/Ti films is investigated. Varying parameters are the annealing temperatures ranging between 450°C and 700°C and the atmosphere of the annealing process, which consists of either air, forming gas and argon gas. The thickness of the Pt/Ti film and the time of the annealing process...
In this paper, a Half-Mode Substrate Integrated Waveguide (HMSIW) with interdigital slots mounted on its surface is used to explore fixed-frequency beam-steerable characteristic of Composite Right/Left Handed (CRLH) antenna based on HMSIW structure. By combining varactors and the PIN diodes with the antenna structure, fixed-frequency beam-steering radiation pattern can be realized. Main goal of our...
H-Plane substrate integrated waveguide (SIW) antenna made of textile for millimeter wireless body area network (WBAN) application is proposed. Three-stepped tapered matching structure was added to a coaxial feed for improving the impedance matching. The ground was extended to the antenna aperture to prevent the degeneration of radiation pattern by phantom. The extended arc shaped substrate improves...
In this paper, a 60 GHz CMOS on-chip dipole antenna with loss-reduced silicon substrate, which had been proposed and simulated by the authors, was measured and gain improvement of approximately 9 dB was obtained. In the antenna, rectangular region with 500 μm × 1000 μm around the dipole is irradiated by proton and conductivity is reduced from 10 S/m (10 Ω cm) to 0.1 S/m (1 kΩ cm). Antenna gain of...
This paper deals with design of Goubau PCB antenna as partial discharge (PD) detector. In the design, Goubau PCB antennas are simulated with a variety of shapes and sizes by using software for antenna design and simulation based on finite element method. The antennas are designed to achieve ultra wide band partial discharge frequency range. Goubau PCB antenna is designed with the type of substrate...
Microbial Fuel Cell (MFC) power production and Microbial Electrolysis Cell (MEC) organic production depend strongly on their dynamic environment conditions, like inlet substrate concentration, temperature, etc. This work presents a discrete extremum seeking controller to quickly tune the MFC and MEC electrical settings in order to achieve maximum performance irrespective of these dynamic environment...
Photovoltaic devices as large-area semiconductor devices are macroelectronic devices, however, solar cells include nanostructures and/or nanomaterials to boost the conversion efficiency of the devices. In this contributions we focus on nanotextures which play an important role in increasing optical performance of solar cells. We present a method of nanotexture fabrication for PV applications based...
The technique of flip-chip ICs SEE testing based on a joint use of focused laser facility and heavy ions with medium range of 100 μm … 200 μm is presented.
The use of inductors is essential for high frequency signal processing. They are key components in oscillators, filters, impedance matching circuits and low noise amplifiers. Inductors are also used in power electronics for the realization of DC-DC converters. In this paper, we present a study of the electromagnetic radiation of integrated planar inductors. Two approaches have been used for the study...
Virtual Network Embedding (VNE) is widely considered as a longstanding challenge in Network Virtualization: how to efficiently embed multiple virtual networks (VNs), with node-link resource requirements, onto the shared substrate network (SN), having finite underlying resources. Most heuristic VNE algorithms in the literature, only considering single network topology attribute and local network resources,...
Metal-insulator-semiconductor capacitors used as a RC snubber attenuate voltage overshoots which may occur during switching phases. These devices feature good temperature stability up to 200°C and can be integrated very close to power switches on the same transfer substrate. As the capacitors need to withstand high voltages in most applications, thick dielectric layers have to be used, causing significant...
This work reports the reliability of Infineon's CoolGaNTM 600V Enhancement mode GaN-on-Si transistors under high temperature reverse bias operation. Using the most conservative lifetime model; the extracted lifetime at use conditions of 480V, 125°C at 0.01% failure rate is greater than 70 years. The extracted activation energy (Ea) is 0.77eV with a single failure mode, Drain to Substrate. A common...
A metallic-target reactive co-sputtering technology is used to fabricate zinc tin oxide (ZTO) thin-film transistors (TFTs). The effect of the O2/(Ar+O2) flow rate ratio on the performance of the resulting TFTs is investigated in detail. It is found that an O2/(Ar+O2) ratio of 11%–12% produces devices with the best performance, including a linear mobility of 8.6 cm2/Vs, subthreshold swing of 0.36 V/decade,...
Scaling in CMOS has increased the attainable operational frequencies, while greatly increasing the transistor's parasitic modeling complexity. Additionally, the performance of the ever-smaller on-chip passives for mm-wave and THz circuits is being degraded by numerous process requirements and limitations, such as high densities of dummy metals. This work discusses the main transistor layout trade-offs...
Tungsten oxide and silver-decorated tungsten oxide were investigated for the detection of oxygen in a humid environment. The sensor materials were deposited onto alumina sensor substrates via aerosol-assisted chemical vapour deposition. Results indicated that our sensors showed good sensitivity to oxygen, following an almost a linear relationship over a 0 to 20% concentration range. In comparison...
Carbon nanotube sensors offer sensitivity and compactness, and provide a versatile chemical platform for ambient monitoring of environmental pollutants such as ozone, ammonia and volatile organic compounds, known to cause acute respiratory health problems (e.g., exacerbations of asthma and COPD). The advances in electronics and the feasibility to interface complex sensor materials with low-resistance...
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