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This paper reports on the technology and design aspects of an industrial DHEMT process for 650V rated GaN-on-Si power devices, using an in-situ MOCVD grown SiN as surface passivation and gate dielectric, with low interface state density and excellent TDDB. Optimization of the GaN epi stack results in very low off-state leakage (<10nA/mm). Due to the reduction of buffer trapping, low dynamic Ron...
We investigate both theoretically and experimentally a new type of laser, which exploits a broadband light “condensation” process sustained by the stimulated amplification of an optical blackbody metamaterial.
By using theory and experiments, we investigate a new mechanism based on spontaneous synchronization of random waves which generates ultrafast subwavelength rare events in integrated photonic chips.
This paper proposed an uplink positioning algorithm of adaptive extended Kalman filter (AEKF) aided with time difference of arrival (TDOA) measurements between the pairs of four eNBs for estimating the position of moving user equipment (MUE). The concept of cloud-assisted femtocell network to determine the optimally distributed four eNode Bs (eNBs) is provided in order to guarantee the accuracy of...
The corresponding energy landscape and surface potential are deduced from the experimental ferroelectricity of HfZrO2 (HZO) for low-power steep-slope transistor applications. The anti-ferroelectric (AFE) in annealed 600°C HZO extracted electrostatic potential gain from the measured polarization hysteresis loop and calculated subthreshold swing 33 mV/dec over six decades of $I_{\rm DS} $ . A feasible...
A leading edge 14 nm SoC platform technology based upon the 2nd generation Tri-Gate transistor technology [5] has been optimized for density, low power and wide dynamic range. 70 nm gate pitch, 52 nm metal pitch and 0.0499 um2 HDC SRAM cells are the most aggressive design rules reported for 14/16 nm node SoC process to achieve Moore's Law 2x density scaling over 22 nm node. High performance NMOS/PMOS...
A leading edge 14 nm SoC platform technology based upon the 2nd generation Tri-Gate transistor technology [5] has been optimized for density, low power and wide dynamic range. 70 nm gate pitch, 52 nm metal pitch and 0.0499 um2 HDC SRAM cells are the most aggressive design rules reported for 14/16 nm node SoC process to achieve Moore's Law 2x density scaling over 22 nm node. High performance NMOS/PMOS...
In this work, we present a systematic study on AlGaN surface treatment by N2 plasma treatment prior to SiN deposition to enhance the reliability of the AlGaN/GaN MIS-HEMT. N2 plasma treatment can effective remove surface impurities and discharge at the GaN surface, thus improving the SiN/GaN interface quality. With this technique, the GaN MIS-HEMT exhibits excellent reliability after high-gate-bias...
High performance p-type SnO TFTs were fabricated and characterized in this work. Owing to thermal oxygen annealing process, the originally tin-rich oxide film was transformed into a polycrystalline SnO, resulting in decent field-effect mobility and high on/off current ratio. Electrical stability was evaluated by examining the threshold voltage shift under negative bias stresses at different stress...
The Artificial Bee Colony (ABC) algorithm is a new swarm optimization algorithm with good numerical functions optimization results. In order to enhance the performance ability of ABC algorithm, a hybrid ABC (HAB) algorithm is presented where swarming behavior of bacterial foraging optimization algorithm is introduced into the ABC algorithm to do local search. The performance of the proposed method...
Iron chalcogenide compounds (FexSey) have regained considerable interest due to the recent discoveries of interesting properties, such as superconductivity in PbO-type FeSe1−x and huge coerciv-ity in monoclinic Fe3Se4 nanostructures [1-3]. There are two well-known magnetic compounds in this family: a hexagonal phase with the approximate composition of Fe7Se8 (H-phase) and a monoclinic phase with an...
This paper investigates a new direct-drive machine, which artfully integrates a permanent-magnet brushless machine (PMBM) into a magnetic gear (MG). In order to achieve the capability of low speed operation and high torque output, the PMBM and MG share the same high-speed rotor. The key of the proposed machine is to adopt the Halbach permanent-magnet (PM) arrays and employ them to compose the PM poles...
Upon the increasing attentions on energy efficiency and hence environmental protection, the development of the electric vehicles (EVs) has been accelerating [1]. Particularly, the electronic differential (ED) system has been developed to eliminate the heavy gearbox for the curvilinear movement [2]. Yet, the traditional ED system is achieved by controlling each of the wheels independently, while fatal...
By using the powder metallurgy technology and magnetic isotropy characteristic of the soft magnetic composite (SMC) material, various kinds of the complex structure permanent magnet synchronous machines (PMSMs) can be designed and fabricated easily e.g., axial-flux machine, claw pole machine (CPM) and transverse-flux machine (TFM) [1]-[4]. With the global coil applied in the CPM and TFM, the CPM and...
Soft magnetic composite (SMC) material is a relative new soft magnetic material which has undergone the substantial development during last decades. Especially with the low-pressure pressing on the mold, the magnetic core with SMC of the machine can be fabricated easily and the manufacture cost can be reduced greatly. By using this technology, a claw pole machine (CPM) with SMC core was designed and...
In this paper, a long flux-path winding connection (SSNN) mode of SRM is presented. SSNN mode can reduce the mutual inductance between conducting phases, and thus realize the decoupling between each phase. Based on a six-phase 12/10 SRM, extensive finite element analysis simulation results demonstrate the effectiveness of the proposed winding connection.
Brushless excitation generator is highly reliable and easily maintained.[1] In this paper, an integrated brushless excitated method (IBEM) is proposed in this paper. It can realize brushless excitation for the generator whose excitation windings are placed on the rotor. A brush excitation Tangential/ Radial Hybrid Excitation Synchronous Generator (T/R-HESG) is improved as brushless excitation generator...
The power cable has been widely used for decades. As an important accessory of power cable, the cable joint is the weak link because of site installation conditions. Partial discharge and insulation aging in it cause temperature rise, which may lead to explosion of the cable joint in serious conditions. There are many researches about temperature rise of the cable and cable joints. By measuring the...
Flux-switching DC-field (FSDC) machine has the merits of low-cost and flux control ability. Furthermore, this type of machine also possesses the advantage of fault-tolerant capability [1]. However, a few studies have been done on the analyses of fault signatures of this type of machine even though it has two sets of windings [2].
This paper presents a multidisciplinary design analysis method for permanent magnet (PM) motors with soft magnetic composite (SMC) cores. Firstly, a multidisciplinary design analysis process is investigated to evaluate the performance of these motors, which includes electromagnetic analysis (based on new core loss model), thermal analysis, and mechanical modal analysis. Then a lumped 3-D thermal network...
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