This paper investigates the sensitivity of inductive power transfer systems for electric vehicles battery charging. The goal of the analysis is to assess the impact of harmonics on the transferred power and on the eff...
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ISBN:
(纸本)9781728112015
This paper investigates the sensitivity of inductive power transfer systems for electric vehicles battery charging. The goal of the analysis is to assess the impact of harmonics on the transferred power and on the efficiency, in order to define the main specifications for design and calibration of relevant measurement systems. The first harmonic approximation models of a Series/Series system and a Series-Parallel/Series system is developed to perform the analysis with respect to the variations of main operating parameters and coils mutual coupling. The resulting model predictions are validated by comparison with PSIM simulations.
This paper presents the simulation comparison of two Interpolated DFT frequency estimation methods in the control of a renewable energy system. The first method uses four points of the spectrum in calculations and MSD...
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ISBN:
(纸本)9781728112015
This paper presents the simulation comparison of two Interpolated DFT frequency estimation methods in the control of a renewable energy system. The first method uses four points of the spectrum in calculations and MSD (Maximum Sidelobe Decay) time windows and the second method uses three points of the spectrum and Generalized MSD time windows. simulations were performed for a modeled pure grid signal as well as signal distorted by Additive White Gaussian Noise and harmonic components in a very short estimation time. Both methods are very fast but the more accurate is the second method. The accuracy in real measurement conditions is in the order of 10(-4) Hz/Hz or 10(-3) Hz/Hz depending on the signal quality.
The sensitivity of integrated circuit parameters regarding manufacturing process variation represents a very important ongoing topic in the semiconductor industry. Establishing the functional relationship between them...
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ISBN:
(纸本)9781728112015
The sensitivity of integrated circuit parameters regarding manufacturing process variation represents a very important ongoing topic in the semiconductor industry. Establishing the functional relationship between them at an early stage, i.e. simulation, would create an advantage in terms of circuit improvement and eventually high production yield. This paper presents a methodology for finding the influence of technology parameters (i.e. Process Control Monitor parameters) on device performance. The methodology is based on Machine Learning algorithms and Bayesian Optimization framework with the purpose of modelling the functional dependencies between technology and circuit parameters. The experimental results prove that the device performance is highly sensitive to technology parameters variation and this dependency can be modelled.
In this paper, we present a wireless and electrode-less Quartz Crystal Microbalance (WE-QCM) sensor measurement system. The QCM characteristics are measured using a network analyzer and microstrip antennas and the res...
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ISBN:
(纸本)9781728112015
In this paper, we present a wireless and electrode-less Quartz Crystal Microbalance (WE-QCM) sensor measurement system. The QCM characteristics are measured using a network analyzer and microstrip antennas and the results are modeled by Butterworth Van Dyke (BVD) electrical equivalent circuit model. The WE-QCM model and the proposed energy detection transceiver based wireless measurement system are simulated using analog mixed signal (AMS) tools. The mixed signal simulations show that less than 0.5 kHz sensitivity in frequency variations can be achieved with the proposed system model.
This paper aims to model Parasitic Light Sensitivity (PLS) in Global Shutter CMOS Image Sensors (GS-CIS) through separation of the optical problem from the carriers motion one, reducing required simulation time. The o...
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ISBN:
(纸本)9781728112015
This paper aims to model Parasitic Light Sensitivity (PLS) in Global Shutter CMOS Image Sensors (GS-CIS) through separation of the optical problem from the carriers motion one, reducing required simulation time. The optical problem is solved thanks to Finite-Differences Time-Domain (FDTD) simulations. Solution to the carriers motion problem is shown in two ways: through use of Boltzmann Transport Equation (BTE) and through a straight line type of motion. The results show good reproduction of experimental data behavior, though fitting has still to be improved.
To guarantee a high level of solder joint durability for soft solder die attach, a uniform bond line thickness is crucial. In addition, for high electrical performance, a low void concentration is desirable. However, ...
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ISBN:
(纸本)9781538680407
To guarantee a high level of solder joint durability for soft solder die attach, a uniform bond line thickness is crucial. In addition, for high electrical performance, a low void concentration is desirable. However, these goals arc difficult to achieve during reflow soldering. The die tilt and the formation of voids are mainly controlled by fluid forces. We develop a fluid dynamical model to better understand these mechanisms. The model is validated using experimental data. In order to use the model for design improvement, the simulation model is coupled with a genetic optimization algorithm. This arrangement can help to develop designs which lead to (a) uniform bond line thickness and (b) minimal void concentration. Furthermore, advanced search strategies act as an enabler for the generation of innovative design features. They may in turn foster the formulation of new intellectual property. To illustrate the spectrum of possible application scenarios, we show three industrial use cases.
Signoff timing analysis is essential in order to verify the proper operation of VLSI circuits. As process technologies scale down towards nanometer regimes, the fast and accurate timing analysis of interconnects has b...
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ISBN:
(纸本)9781728112015
Signoff timing analysis is essential in order to verify the proper operation of VLSI circuits. As process technologies scale down towards nanometer regimes, the fast and accurate timing analysis of interconnects has become crucial, since interconnect delay represents an increasingly dominant portion of the overall circuit delay. It is a common view that traditional SPICE transient simulation of very large interconnect models is not feasible for full-chip timing analysis, while static Elmore-based methods can be inaccurate by orders of magnitude. Model Order Reduction (MOR) techniques are typically employed to provide a good compromise between accuracy and performance. However, all established MOR techniques result in dense system matrices that render their simulation impractical. To this end, in this paper we propose a sparsity-aware MOR methodology for the timing analysis of complex interconnects. Experimental results demonstrate that the proposed method achieves up to 30x simulation time speedups over SPICE transient simulation of the initial model, maintaining a reasonable typical accuracy of 4%.
The paper proposes an accurate, fast and advanced neural network approach to model the small signal behavior of GaN High Electron Mobility Transistor (HEMT). The presented approach makes use of the nonlinear autoregre...
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ISBN:
(纸本)9781728112015
The paper proposes an accurate, fast and advanced neural network approach to model the small signal behavior of GaN High Electron Mobility Transistor (HEMT). The presented approach makes use of the nonlinear autoregressive series-parallel and parallel architectures to model a 2x200 mu m device for a broad frequency range of 1GHz - 18GHz. A comparison is drawn between the two architectures based on the training algorithm, accuracy, convergence rate and number of epochs. An excellent agreement is found between the measured S-parameters and the proposed model for the complete broad frequency range. The proposed model can be embedded into computer aided design tool for an accurate and expedited design process of RF/microwave circuits and systems.
During the design of acceleration measuring system, the optimal choice of sensor parameters may only be made by careful analysis of both the MEMS sensor itself and the readout circuit. Therefore, a coupled electromech...
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ISBN:
(纸本)9781538680407
During the design of acceleration measuring system, the optimal choice of sensor parameters may only be made by careful analysis of both the MEMS sensor itself and the readout circuit. Therefore, a coupled electromechanical simulation is usually required. In this paper, we use such a simulation to determine the values of modulation voltage and switching frequency which ensure that the relative readout error is within acceptable limits. Three capacitive MEMS accelerometer structures are analyzed and the relative error due to the impact of electrostatic force is quantified. Based on these results, the recommendations about the optimal readout circuit parameters are given.
This paper presents a methodology to model and optimize the power supply rejection (PSR) for a low-dropout regulator (LDO) in system-on-chip (SoC) applications. Since SoC designs integrate multiple functions on a sing...
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ISBN:
(纸本)9781728112015
This paper presents a methodology to model and optimize the power supply rejection (PSR) for a low-dropout regulator (LDO) in system-on-chip (SoC) applications. Since SoC designs integrate multiple functions on a single chip, the Power Management Unit (PMU) becomes crucial to meet the requirements for multiple sub-blocks. The supply ripple, which has a significant impact on sensitive analog/RF sub-blocks, needs to be reduced by achieving optimized PSR performance in LDO designs. This paper begins by modeling the conventional LDO topology. The transfer function of the model is calculated, so that the system behaviour can be remapped to the parameters of the sub-blocks. Additionally, the verification is done by comparing the model and a transistor level design. Finally, the methodologies are discussed in two cases, namely a PSR of -50 dB@100 kHz and a full-spectrum PSR of -50 dB. The results show that different design strategies generate practical design trade-offs, although all strategies can theoretically achieve the cases. With the proposed methodologies, the design parameters can be clearly and efficiently optimized to achieve optimum PSR performance.
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