The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This work presents an ultra-low voltage DC-DC boost converter vibration-based energy harvesting. A switching gate controlled concept is used which is well suited for low vibration-based frequency and voltage applications. The 0.1–0.5 V input voltage range is linearly increased with the increase of output voltage range, 4–22 V. The transient analysis is simulated to verify the optimum value of the...
In this paper, we describe the development of small signal model of a CNTFET. The development consist of high frequency response of CNTFET. The CNTFET generates higher output rather than the conventional Si MOSFET. An SPICE model for enhancement mode Carbon nanotube transistor has been developed. The performance analysis of the CNTFET shows the desirable performance parameter in terms of 10 Thz frequency...
The geometrical structure of carbon nanotubes has been calculated and analyzed in this paper. The analysis of carbon nanotube for Pz orbital, perpendicular to the graphene sheet and thus the nanotube surface forms a delocalized π network across the nanotube, which is responsible for its electronic properties. These electronic properties are obtained from tight binding (TB) model for graphene. Furthermore,...
The future of Smart Grid is based on grid-integrated real-time communications between the grid elements of generation, transmission, distribution and loads. Due to Zigbee/IEEE 802.15.4 standard's features such as low cost, low power, low data rate, short range, simplicity and free licensed spectrum which makes Zigbee-based wireless sensor networks (WSNs) the wireless technology of choice for smart...
RFID tags, sensors embedded with buried devices and biomedical implants all operate at low voltage levels due to power limitations. The ever increasing use these embedded devices has also created a demand in the industry for low-voltage power supplies. Since many of these circuits are mobile in nature and so are bound to operate in many different environments, the power supply must also be capable...
This paper suggests the modeling phenomena of small band-gap Carbon Nanotube (CNT). Device physics of CNT is studied and do the calculation of sub-band for zigzag CNT to model small band-gap tubes. Each carbon nanotube is described as a graphene sheet rolled into a cylindrical shape so that the structure is one dimensional with axial symmetry. A comparison is made with the current literature to show...
In this paper, graphene electronic structure of carbon nanotubes has been analyzed and validate with past theoretical and experimental results. The energy dispersion relation, effective mass and intrinsic carrier concentration of graphene have been analyzed to build diverse carbon nanotubes. The electronics properties of graphene are subject to change with the different diameters and wrapping angles...
This paper discusses obtaining further results looking at the implementation of a full-wave rectifier based on phase-modulation. Phase modulation is used to obtain a low-voltage DC supply by controlling phase-angle through changes in a variable resistor and capacitor. This property allows for AC rectification along with an inherent voltage regulation feature. The response of the circuit is recorded...
In this paper simulation results are obtained, focusing on shaping of a simple sub-nanosecond width UWB pulse generated by a suggested circuit. The shaping is done through using a capacitor-resistor (RC) pair. The RC pair is acting as a high pass filter, allowing the pulse with almost unity gain in the high frequency band. The low frequency components making the width of pulse are difficult to pass,...
In this paper a simple pico-second pulse generator, its working principle and design. The design is supported by relevant theory, explaining the function of the circuit, and to ultimately show how the resulting pulses are related in their widths to respective parameter values of the circuit elements. The circuit is based on using four timers ICs with transistor and other external logic component....
A multi-valued logic outputs for analog to digital (ADC) have been implemented in this paper. The use of multiple-valued logic outputs for ADC design offers the possibility of an overall reduction in circuit complexity and size. The ADC generates multi-valued logic outputs rather than the conventional binary output system. The design implements current mode ADC architecture and is simulated using...
The significance for measuring the accurate flow rate of gases in pipelines has been ever-increasing in the industrialized regions. There arises the need for gross measurements of gas-flow at some points while more accurate measurements of gas-flow are needed at some other points in an industry. Moreover, as the industry develops it undergoes changes for more comfortable user friendly way of gas flow...
This paper shows the simulation results of the effects of phase difference on the output ripple voltage of a low voltage power supply circuit. The circuit uses a rectifier circuit which adds the squares of two out-of-phase sine waves. The circuit focuses on the constraint of rectifying a low voltage input AC source while analyzing the ripple voltage in the output and is designed in such a way that...
This paper presents the categorization of magnetic and non-magnetic materials across a low frequency band through conducting a non-contact measurement of a passive resistive element for low frequency applications. Three different materials have been used as core for the coupled coils. The experimental results for the test circuit with inductive and resistive load separately are obtained under different...
Multi-band antennas are very important in many application systems such as mobile phone jammer. A new shape triple-band microstrip antenna is proposed in this paper. By embedding h-shaped slots placed in the centre of a microstrip patch, the triple-band character can be achieved. Procedures to select the length and location of the h-shaped slots were discussed in detail. The required antenna gain,...
This work is about modeling a readout system across narrow gaps using inductive means for a contact-less transfer of signal. The signal source could be devices implanted in humans or animals or even devices embedded buried in inaccessible locations for monitoring purposes, while the readout devices are normally in accessible locations in the external world. This work focuses on modeling the coupled...
Rain fade slope is very useful knowledge used to design of the fade countermeasures in satellite communication link. Recently, ITU-R has proposed fade slope model by limiting elevation angle up to 500. Rain fade slope was measured from downlink of space-earth path of MEASAT3 in Kuala Lumpur (3.30 N, 101.70 E), Malaysia for one year period during 1st July 2010 – 30th June 2011. The elevation angle...
Powering implantable low wattage biomedical devices and sensors through non-contact means is on the rise over the past recent years. In view of that, inductive coupling is currently the most favorable means of transferring energy for powering the low wattage implanted devices. The wireless inductive link works as an energy link to power up remote devices and also acts as a communication link to retrieve...
The advancement of magnetic sensors in biomedical sector has led toward an immense range of applications. Inductive coupling link has been validated as the most suitable and efficient means for wireless transfer of signal where coupling coefficient plays a crucial role to determine the strength of the transmission in power transfer. In view of that an urgent investigation of the relative magnetism...
Monolithic fabrication and advancements in MEMS and nanotechnology have made biomedical implants more popular for monitoring and other applications in humans and animals. One of the primary challenges faced in employing implants is providing a stable battery-less power supply. Inductive coupling is a commonly used means of transferring energy to implanted devices requiring power in milliwatt or microwatt...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.