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Simulation of graphene-GaAs Schottky junction solar cell with graphene gate is performed by using finite difference method. Poisson and driftdiffusion equations are solved self-consistently to capture carrier dynamics in the solar cell. Our algorithm is verified by comparing with experimental results. The Schottky barrier between graphene and GaAs can be tuned by graphene gate, and hence the open...
An accurate marching-on-in-degree (MOD) scheme is proposed to solve the time-domain integral equation (TDIE) integrated with the modified nodal analysis (MNA) for simulating transient field-circuit coupling problems. In the MOD scheme, a set of weighted Laguerre polynomials is chosen as the temporal basis functions. Besides, the current continuity equation is modified for connecting the electromagnetic...
Predicting the High Intensity Radiated Field (HIRF) coupling in complex system is highly required in the aeronautic industry, which can be performed by electromagnetic simulation. But the validation of electromagnetic simulation is a difficult issue which needs proper flowchart and validation methods. In this paper, the numerical simulation by the parallel Finite-Difference Time-Domain (FDTD) method...
A nonuniform scaling technique is proposed for the synthesis of lossy filters realized by parallel-coupled pairs. By adding two or more non-resonating nodes for each coupled pair to nonuniformly distribute the losses, more design freedom can be provided to adjust Q-factors. For the fourth-order generalized Chebyshev filter, a uniform Q is obtained with Q=490. And for a 10-4-4 lossy filter, the insertion...
In this paper, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is proposed for efficient simulation of graphene-based frequency selective surfaces (GFSS) at Terahertz band, with the Drude model of monolayer graphene and associated auxiliary differential equation (ADE) technique implemented into the numerical methods for solving the Maxwell's equations. Numerical simulations...
Memory is very important in the present era of Internet of Thing (IoT) and Big Data, while Resistive Random Access Memory (RRAM) is a key member in the family of non-volatile memory. However, in the development of high density RRAM memory array, self-heat effect (SHE) as well as thermal crosstalk must be understood and controlled during its operation. In this paper, simulation of electrothermal effects...
Electrothermal characterization of the advanced SOI FinFETs is performed in this paper, which is based on some analytical equations as well as in-house developed finite difference algorithm. The temperature-dependent properties of thermal conductivities of all materials involved are considered in our simulation, with results validated by the commercial software ANSYS and other analytical solution...
Monolayer MoS2 photodetectors are modeled and simulated by self-consistently solving diffusive transport equations in the presence of light illumination with the two-dimensional (2-D) Poisson equation. The simulated results indicate that very high photoresponsivity (PR) of ∼1000A/W observed in others' experiments is due to strong electrostatic effect of pile up of optically generated holes, and efficient...
Convolutional Neural Networks(CNNs) have been confirmed as a powerful technique for classification of visual inputs like handwritten digits and faces recognition. Traditional convolutional layer's input feature maps are convolved with learnable kernel then combined for achieving better performance. The biggest drawback is that the combination of feature maps can lose features and do not apply well...
Crosstalk between the interconnects cause serious electromagnetic interference (EMI). The high density interconnects, including redistribution layers (RDLs) and through-silicon-vias (TSVs) in silicon interposer, require effective crosstalk-reduction signaling schemes. In this paper, a novel co-planar waveguide (CPW) RDL structure, where the ground lines directly contact the silicon substrate without...
An improved hybrid leapfrog ADI-FDTD method is developed for accurately characterizing complex electromagnetic environment effects (E3) on a warship with multi-wire antennas in this paper. It has the capabilities for fast extracting mutual couplings (S-parameters) among different wire antennas as well as capturing induced current and electric field distributions on such an electrically large platform...
Conformal FDTD method is developed for simulating an electromagnetic pulse (EMP) with multiple wedge structures made of PEC, dielectric, and even PEC and dielectric composites, respectively, where the FDTD result agrees very well with that of the Method of Moments (MoM) and Physics Optics (PO). Numerical investigations are further carried out for capturing transient responses corresponding to scattering,...
A transparent broadband absorber consisting of two periodic graphene resistive patterns separated by dielectric layers is investigated in the paper. The proposed absorber achieves 95% absorption from 39.2 GHz to 200 GHz with 134% fractional bandwidth, due to the multiple resonances provided by periodic patterns and tunability of graphene surface conductivity. Furthermore, the absorber shows relatively...
This paper demonstrated electro-thermal- stress interaction of Gallium Nitride (GaN) high electron mobility transistors (HEMTs) breakdown with a high-power microwave (HPM) pulse injected. A series of GaN HEMT-based power amplifiers were designed and measured by using a special HPM system for characterizing their power-to-failure values. The crack area in the field plate of GaN HEMT was also characterized...
Shielding cover effects in LDMOS transistor are investigated in this paper. The internal and outer matching structures on the PCB are simulated using the commercial full-wave software HFSS. Under an Automation Testing Bench, the input-output responses of PA module are measured and compared. Finally, an improved scalable LDMOSFET PA model is proposed to predict three feedback path which give further...
Some improvements in the design of LDMOSFET power amplifier (PA) are demonstrated for effectively suppressing metallic shielding cover (MSC) effects. The internal and outer matching structures on the PCB are at first simulated and optimized using the commercial full-wave software HFSS. Further, they are integrated with the lumped-element circuit model of die and co-simulated using the software ADS...
Computational electromagnetics (EM) as well as multiphysics (MP) methods remain very challenging tasks even with nowadays. This talk will give a brief outline from CEM to CMP. Further, their applications for solving various complex electromagnetic environmental effect problems will be addressed. In particular, main challenges in the development of MP algorithm will be indicated and key strategies...
This paper analyzes the frequency-domain EMC/EMI problems including complicated transmission lines and printed circuit boards (PCBs) that reside in metallic rectangular cavities, by using an efficient iterative Fast Fourier Transform (FFT)-accelerated integral-equation method. The internal field distribution and near-field coupling/interference of multiple transmission-lines and PCBs in cavities can...
This paper presents the study of electro-thermo-mechanical responses of bonding wire arrays used for the design of lateral double-diffused MOSFET-based RF amplifier. We at first show a series of ruggedness measurements of bonding wire arrays with a mismatch control system and an IR microscopy used for accurately predicting their surface temperatures. Further, an in-house time-domain finite element...
It is well-known that both Performance and reliability of present-day RF integrated circuits (RFICs & MMICs) and even Nano electronic devices cannot be completely understood or accurately predicted from electromagnetic considerations alone. For example, the performance parameters, such as S-parameters, power handling capability and breakdown thresholds of high-density nano interconnects and RF...
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