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In this paper, on-wafer de-embedding methods for passive components are evaluated for millimeter wave integrated circuit (MMW IC) design support. An electromagnetic simulation aided de-embedding (EMSAD) technique is proposed. The electromagnetic model is calibrated by matching the open-short de-embedded measurement at relatively lower frequencies. A set of Ground Coplanar Waveguide (GCPW) test structures...
This paper presents experimental validation of a high-fidelity toroid inductor modeling technique. The aim of this research is to accurately model the instantaneous magnetization state and core losses in ferromagnetic materials. Quasi-static hysteresis effects are captured using a Preisach model. Eddy currents are included by coupling the associated quasi-static Everett function to a simple finite...
RF probe measurements are widely used for characterizing circuits in the millimeter-wave frequency range. Especially above 200 GHz the large dimensions of the RF probe, in comparison to the wavelength, lead to parasitic effects which will effect the device under test. Since the measurement is influenced by the electro-magnetic coupling between probe tip and the test structures on the substrate, the...
In this paper an ultra high bandwidth signal generation MMIC is presented. Based on an fundamental oscillator working at 75 GHz followed by a two stage frequency quadrupler, an output frequency range from 231.2–309.1 GHz is achieved, resulting in an overall tuning range of almost 78 GHz. The maximum output power of the transmitter MMIC is −2.8 dBm with a power variation of 7.5 dB over the complete...
SNAP is a program for symbolic analysis of linear or linearized circuits and systems developed at Brno University of Technology, provided as freeware. The paper presents a new version of the program, which contains a new schematic editor and rewritten simulation engine. A unique property of SNAP is a system of libraries that allows user definition of new behavioral models, including non-electrical...
This paper is focused on proposing and comparing the performance of different wideband models intended to represent a 10 kVA 7.967 kV/240–120 V single-phase transformer with center-tapped secondary used in rural distribution networks in Brazil. The terminal behavior of this transformer is characterized by three different modeling approaches: (i) reduced-order model, (ii) full-order admittance-based...
Due to with the actuality of the task of interconnection of non-synchronously operating alternating current energy systems, an experimental comparison of the interconnection devices models, which implement various methods of operation of these devices, is required. Therefore, a stand is needed, that allows conducting experimental studies with the specified models of devices. The basis of the stand...
This paper presents the results of a series of tests to determine the influence of high-frequency injected ripple currents on the Dynamic Charge Acceptance (DCA) performance of lead-acid batteries. A wide-bandwidth battery model is described, this being a hybrid of the standard Randles model and a high-frequency model previously described in literature. A bespoke test procedure is described, based...
This paper aims toward joining the ideas of OBT (oscillation-based testing) and DFT (design for testability). It gives insight into an optimization process that provides testability if one chooses to use the OBT. The optimization procedure is exemplified on a timer device NE555. Utilization of a timer circuit allows avoidance of a specific design of the feed-back loop. The optimization procedure is...
This paper concentrates on the modeling of an in-line MEMS (microelectromechanical systems) frequency discriminator which is applied to the RF (radio frequency) receiver front-ends. In addition to the frequency detection of the RF signal, the resonant frequency of the VCO (voltage controlled oscillator) can be tuned through the output dc thermal voltage generated by the in-line MEMS frequency discriminator...
The use of virtual simulation in industrial design and validation processes has considerably increased over the last years, due to better algorithms, affordable computational power with good performance and gradual acceptance of its results by technical experts. Nevertheless, although electromagnetic simulation has also evolved, it still does not have the same penetration in validation processes as...
Comparators are a critical element of Analog-to-Digital converters (ADCs) intended to operate in a harsh environments such as the automotive. The influence of temperature on key comparator properties such as the delay must be well understood to maximize their speed. In this paper a Double-Tail latch analysis leads to an analytical expression for the delay to more accurately guide the design over a...
This work presents a broadband characterization and modeling of the second harmonic nonlinear response in Bulk acoustic wave (BAW) resonators. The proposed circuit model is based on the constitutive equations describing the behavior of all materials used on the different layers of the resonator. These constitutive equations are extended for both the linear and nonlinear domain, and allow to explain...
The operation of circuit-breakers generates high frequency signals, therefore, a way to capture these signals is a radiometric system to evaluate the operation of the circuit-breaker, the greatest advantage of this method is that it\s possible the analyze the performance of the circuit-breaker without the need of any operational change to insert measuring devices. However, it was necessary to verify...
Techniques for experimental evaluation of the amplitude-frequency characteristic of a radio receiver input filter on basis of the measured frequency characteristic of the receiver susceptibility to two-signal (or three-signal) third-order intermodulation are developed: the known technique based on the fitting of parameters of the filter's theoretical model is generalized to deal with a switchable...
A wireless and portable system, consisting in an electronic board and a computer software graphical interface, is presented in this article as a feasible way to do in-vitro electric bioimpedance spectroscopy of cells. It is designed to work inside a culture chamber performing impedance measurement in the frequency range of 64Hz to 200KHz. The board is equipped with a Bluetooth Low Energy (BLE) module...
A system and source joint estimation method for EM emission modeling is proposed in this paper. Based on the priori knowledge, i.e., the transfer function of system is smooth and the form of source signal was already known, the paper using joint estimation method to solve modeling problems when measured only the emission amplitude spectra at some ports. Experimental results verify the method could...
In this work, we propose a simulation methodology that incorporates derating models of decoupling capacitors for power integrity analysis. The construction of the derating models of decoupling capacitors is based on the impedance measurement and curve fitting method. Three approaches of impedance measurement are compared and the most accurate one is selected to build the derating models. The curve...
This paper investigates the performance of an automotive RKE (Remote Keyless Entry) system under the influence of RF interference, injected by the Bulk Current Injection (BCI) test technique. Measurements indicate a severe degradation of performance in the 15 MHz–30 MHz frequency band where RF current injection level is set at 106 dBμA. Injection at these frequencies leads to failure in correct operation...
Motivated by understanding the ESD-induced currents from body-worn, wire and hose connected medical equipment is exposed to, a computer simulation is presented to estimate the impedance of a human body relative to ground. This 3D model is the basis for transient field calculation. A Method of Moments (MoM) frequency domain solution is transformed into time domain via IFFT for further circuit level...
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