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Electrical impedance characterization represents a practical way to evaluate the electro-mechanical parameters of Capacitive Micromachined Ultrasonic Transducers (CMUTs). This paper describes an accurate CMUT characterization method able to evaluate the electro-mechanical and parasitic parameters by fitting electrical impedance measurements at several bias voltages with an improved equivalent circuit...
This paper presents a method to characterize the power delivery network impedance seen at the silicon level in a high speed I/O interface using pseudorandom bit stream (PRBS) patterns. Moreover, results from a transient simulation using the extracted impedance are compared with laboratory measurements, showing good correlation.
The developed impedance spectrometer and photo-detector system using off-the-shelf and low cost electronic components for the electrical characterization of perovskite solar cells (PSC) and assessment of its photo-electrical conversion efficiency (PCE) is presented. An electrical equivalent model is generated by curve fitting the impedance spectroscopy data, then correlating it with PCE to optimize...
This paper deals with advanced characterization approaches of thin piezoelectric materials enabling accurate modelling of low frequency (<50Hz) bimorph-based cantilever beam. Such structures had been widely studied and actual devices using bulk PZT materials had exhibited the best FoM (Figure of Merit) compared to thin and thick piezoelectric films generally used in MEMS industry. Bulk piezoelectric...
The growth in photovoltaic installations makes characterization and condition monitoring essential. In this paper, broadband impedance spectroscopy is implemented for characterization and performance monitoring of silicon solar cells for near real-time operation. An optimized quasi-logarithmic broadband signal is designed to estimate the impedance response of the cells. Electrochemical equivalent...
This work analyzes the effect of the BMS on the performance of a Li-ion battery module by means of charge, discharge and frequency response tests. A model considering BMS effects is carried out and compared with a model based on a single cell approach. Experimental validation shows that single-cell based approach gives very poor results, and that overall accuracy can be significantly improved by considering...
The development of antennas for RFID tags requires measurement of the parameters; as well as, the response of these to be questioned by a reader, the variation of the parameters with simulation tools and building prototypes of antennas can be evaluated, compared, and verified to determine whether the label complies with the basic requirements. To do this, it requires a methodology to help determine...
In this paper the results of characterization and modelling of capacitors have been presented. The experimental results obtained using RF impedance analyzer have been discussed, and based on them, parameters of equivalent circuits have been determined using analytical model. Approximate functions for parasitic elements of the device have been proposed.
The thermal impedance of Gallium Nitride based High Electron Mobility Transistors (GaN HEMTs) has been characterized using the “3ω method”. We already demonstrated in a previous work that, subject to certain conditions, the voltage oscillation at the third harmonic is the real image of the thermal impedance of the device. In this work, we propose both a theoretical approach to understand the limitation...
This paper presents the characterization of various types of SubMiniature version A (SMA) connectors. The characterization is performed by measurements in frequency and time domain. The SMA connectors are mounted on microstrip (MS) and conductor-backed coplanar waveguide (CPW-CB) manufactured on high-frequency (HF) laminates. The designed characteristic impedance of the transmission lines is 50 Ω...
The thermal impedance of Gallium Nitride based High Electron Mobility Transistors (GaN HEMTs) has been characterized using the “3ω method”. The method was initially proposed by D.G. Cahill to measure the thermal conductivity of bulk materials or layers. We already demonstrated in a previous work that under certain conditions the voltage oscillation at the third harmonic is the real image of the thermal...
The main objective of this work is to develop the classification application for a new promising method for meat characterization getting information about the state of the vacuum packed meat in supermarket. A supervised training using neural networks and according to the back error propagation method is used. The training ensure a classification with high precision and with ability to answer correctly...
In this paper, a GaN HEMT transistor is characterized at 3.5 GHz by passive multi-harmonic source & load pull tuner system in large signal. In order to analyze the effect on PAE and output power from the source and load impedance at fundamental, 2nd and 3rd harmonic frequencies, multi-harmonic source and load pull tuner are used. By using this source & load pull tuner system, Cree's GaN HEMT...
The considerations and challenges, involved in designing a board for SerDes characterization, are analyzed. Analysis of the sources for the distortion of the signal transmitted through the characterization board, as well as measures to mitigate these sources are proposed.
Piezoelectric single crystal relaxor materials, such as (x)Pb(Mg1/3Nb2/3)O3 − (1−x)PbTiO3 (PMN-PT) have higher performance for ultrasound applications than piezoelectric ceramics. However, phase transitions at relatively low temperatures and external pressures affect their behavior well within the range of operating conditions of underwater sonar and actuators and in non-destructive testing at elevated...
Voltage sags are short duration reductions in rms voltage caused by short circuits, overloads and starting of large motors. Voltage sag is much more of a global problem. For proper analysis and mitigation of voltage sag, their characterization is important. The magnitude and durations are main characteristics of voltage sag. In this paper voltage sag and their characteristics have been presented in...
This paper presents the supercapacitor characterization for hybrid vehicle applications. This characterization takes into account frequency, voltage and temperature variations. The frequencies dependence is mainly caused by the dynamics of the ions in the electrolyte. With high frequencies, the ions do not have time to reach the surfaces not easily accessible, located deeply in the pores which causes...
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