The performance and the physical properties of SIMOX (separation by implantation oxygen) MOS transistors are studied from room to liquid helium temperatures with particular emphasis on behavior carrier mobility, threshold voltage, subthreshold swing, leakage current, kink effect. Various substrates, such as partially depleted films annealed at low or high temperature ultrathin (100 nm), analyzed compared. Enhancement- depletion-mode devices different doping levels, channel lengths,...

An analysis of the kink effect in MOS transistors that provides a comprehensive view bulk silicon MOSFETs and SOI devices is presented. This enables quantitative description excess drain current to be obtained for room liquid-helium temperatures. In particular, it found transistor can simply modeled by body effect.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

In this paper, a new relay system that uses the UAV as station between tethered and ground user (TU2U2G) is proposed. The TU2U2G TUAV viable alternative to replace BS provide seamless service over cable simultaneously supplies stable power reliable wired data-link connection from control station. Compared BS, improves coverage due its high altitude. Also, it overcomes antenna down-tilting, which increases path loss in cellular system. addition, drawback of batteries’ limited capacity....

The interface state density of silicon metal-oxide-semiconductor (MOS) transistors operated at room, liquid-nitrogen, and liquid-helium temperatures is investigated using the conventional subthreshold slope technique. magnitude found order 1013–1014/eV cm2 temperature, suggests that such states correspond to localized situated in band tails below mobility edge two-dimensional subband. Moreover, densities by have been confirmed dynamic transconductance

Low-power circuits often employ dynamic voltage scaling and energy harvesting. Such need a power management unit that can convert the source to wide range of target voltages with high efficiency. Targeting such unit, this paper presents reconfigurable architecture switched capacitor (SC) converter. It introduces design optimization methodology determine trade-off among parameters meet goal. The proposed converter employs topology four capacitors. provides 11 conversion ratios: 6 stepdown 5...

A simple analysis of the kink effect in MOS transistors is proposed. This enables a quantitative description excess drain current as function channel length to be obtained both at room and liquid-helium temperatures. More specifically, it demonstrated that reduction normalized Delta I/sub d//I/sub d/ /sub sat/ short-channel arises from combined effects charge sharing saturation velocity through lowering depletion capacitance transconductance.< <ETX...

A study of the normalized drain current spectral density SId/I2d as a function has been carried out on n channel metal-oxide-semiconductor transistors at very low (4 K), (77 and room temperatures. It is demonstrated experimentally that dependence strongly correlated to transconductance-current ratio squared (gm/Id)2. This result clearly shows carrier-number fluctuation model applicable not only temperature but also Therefore, it proved mobility inadequate for interpretation our flicker noise data.

A new analytical model of air‐to‐ground (A2G) channel between a low altitude unmanned aerial vehicle (UAV) and mobile station is derived. It proposed for the dense urban environment at frequencies (1, 2 5.8) GHz. The terms are determined on basis ray‐tracing simulation analysis A2G knife‐edge diffraction theory. compared with other shows better results standard error confidence interval validation. Furthermore, effects changing frequency UAV height path loss probability line sight discussed....

The Partial Shadowing (PS) is one of the hotspot topics and significant challenges in Photovoltaic (PV) systems.The PS PV modules cause serious energy loss energy.It observed (using detailed simulation MATLAB programs) that, effect clear on both I-V & P-V output characteristics (Ch/s) curves.Also, it due to when no diode used significantly large.But diodes are used, decreases appreciably.The saving increases as number per module increases.It proposed here increase each group solar cells...

An analysis of silicon metal-oxide-semiconductor (MOS) transistor operation at liquid-helium temperature is presented. More specifically, analytical models providing the drain current and transconductance characteristics in linear nonohmic regions are established presence source-drain series resistances. These models, which rely on a specific mobility law for very low temperature, enable good description MOS to be obtained. They permit understanding prediction effects resistance both...

For the time being there are many Global Navigation Satellite Systems(GNSSs) in world that have both navigation and timing capabilities.Most of GNSSs share a great part design architecture transmitter receiver.So, it became necessary to use flexible tools system facilitate modernization plans current systems launching new systems.This article introduces look for simulation Galileo signals using Graphical programming language; which is SIMULINK.

Single Carrier Frequency Division Multiple Access (SC-FDMA) is proposed for uplink transmission of Long Term Evolution Advanced (LTE-A) due to its lower Peak Average Power Ratio (PAPR) compared Orthogonal (OFDMA).In this paper, a comparison introduced between two subcarrier mapping schemes, Localized-FDMA (LFDMA) and Interleaved-FDMA (IFDMA), in terms PAPR.Moreover, the paper addresses performance SC-FDMA with Pulse Shaping (PS).Since conventional Raised Cosine (RC) PS introduces trade-off...

In this paper, a system of hybrid pixel detector has been developed. The purpose is to create flexible and reliable model that simulates the entire system, starting from 3D data acquisition processing analysis. flexibility achieved by minimizing interdependencies among its entities, so they can be added or removed as needed. implementation accomplished using SILVACO Simulink/MATLAB. simulated investigate electrical performance. It designed such have good charge collection efficiency,...