The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper reports on the implementation of a transcutaneous capacitive wireless power transfer (C-WPT) strategy for biomedical implants. The approach is based upon a series resonant converter in which the tank capacitors are replaced with a capacitive link comprising two pairs of coated parallel plates aligned around the tissue as the dielectric material. Miniaturized printed-circuit boards are developed...
A new readout scheme for passive LC sensors based on the Fast Fourier Transform (FFT) method is presented here. The sensor coil of the LC sensor is magnetically coupled to a readout coil. The maximum value of the imaginary part of the impedance of this system occurs at the sensor resonance frequency (fp). In the conventional systems, it is the real part of the impedance which becomes maximum at fp...
Due to the rising electrification, there is a need for innovative charging technologies to keep pace with technological progress and tethered charging. The electrical performance of wireless power transfer (WPT) systems is one crucial point in charging electric vehicles. The resonance frequency respectively the switching frequency of the converter has a large impact on system behavior. Due to component...
This paper presents the design and characterization of a miniaturized tunable bandpass filter utilizing high-Q ceramic coaxial resonators and commercially available RF-MEMS tunable digital capacitors. A proof-of-concept 2-pole tunable filter occupying only 10 × 10 mm2 is demonstrated with a frequency tuning range of 800–1100 MHz and bandwidth tuning range of 6–13%.
This paper presents a passive wireless Pb2+ sensor by employing ion-responsive hydrogel with an inductor capacitor (L-C) resonator. When water passes through the device flowing into a hydrogel cavity, the hydrogel in the cavity swells and changes the capacitance of the integrated L-C resonator, which in turn changes the resonant frequency that can be remotely detected by using the phase-dip technique...
This paper includes a look into the resonant phenomena of the Multistage Stacked Boost Architecture and a dedicated control method for the MSBA converter to handle these resonances. A linearized fast feed-forward control relying on the feedback of the output current was implemented for the boost stage and the MSBA stages. This was verified by simulations as well as measurements with a low voltage...
A new method for online estimation of power-stage parameters and autotuning of feedback controller for point-of-load (POL) converter is presented in this paper. The autotuning controller presented has been specifically developed to handle wide variations of the resonant frequency of LoCo output filter and the equivalent series resistance (ESR) zero of output capacitor. The resonant frequency of Lo...
Passive components embedded into printed circuit boards (PCBs) are of great interest to enhance the size reduction, the integration density increase and the number of functionalities of electronic circuits. This technology enables to increase the operating frequency towards higher frequencies and improve the reliability. A large number of passive components used on an electronic board are capacitive...
This paper deals with the design and performance study of a frequency-agile notch antenna that covers low E-UTRA frequency bands ranging from 600 MHz to 900 MHz. A miniature notch antenna with a length of λ/18 at 900 MHz is proposed and antenna tuning is provided by a SOI CMOS tunable capacitor. To predict the resonance frequency of the proposed antenna, a Transmission Line Model of the antenna is...
Recently, a world is the point of need with new energy of high efficiency measures according to global climate change issues and energy shortages. [1] One of the various measures an energy control is to design and development at a precise circuit that can be used conservation and efficiency as the center with the power in industrial apparatus. High-frequency induction heat treatment industrial facilities...
Voltage-source converters need grid-side filters to connect to the grid. These grid-side filters on the one hand couple the converter-generated grid-side voltages to the grid voltages and on the other hand mitigate the influence of the switching of the power-electronic devices of the converter on the grid. While uncontrolled diode bridges usually couple via inductances (due to their low switching...
This contribution presents results from an investigation into conducted emissions of an automotive inverter in a component level EMC test setup with unshielded cables. The primary goal of the investigation is to develop a profound understanding of the shape of the disturbance voltage's frequency spectrum at the line impedance stabilization network. Complying with that objective, common-mode currents...
Power delivery is a well-known challenge for high-end microprocessor systems. Comparatively, mobile computing platforms typically consume order-of-magnitude lower currents, but economic and volume constraints limit the quality of the Power Delivery Network. In addition, the trend towards GHz+ operating frequencies and the ubiquity of low-power techniques such as clock-gating and power-gating, make...
Wireless power transfer (WPT) via magnetic resonant coupling (MRC) proposed by a research team of Massachusetts Institute of Technology (MIT) in 2007 [1], has caused increasing interest in research and development of WPT technology. The WPT coils which are operated with the same resonance frequency are the core of the MRC-WPT. Until now, there have been two basic structures to implement MRC-WPT system...
Measurements of resonant ultrasonic frequencies of multilayer ceramic capacitors (MLCCs) were performed as a function of excitation amplitude to assess the potential of nonlinear acoustic methods for sensing the presence of cracks. The ultimate objective of this work is to establish an approach for nondestructively screeningMLCCs for susceptibility to failure that arises from the evolution of structural...
Embedded capacitor technology is receiving considerable attention due to the size reduction, increase of the integration density and the number of functionalities of electronic circuits. This technology enables to reduce the parasitic inductances because of its shorter leads that allow increasing the operating frequency towards higher frequencies. In this paper, we describe the methodology used to...
De-poled PZTs (Lead-Zirconium-Titanate) were studied in the terms of nonlinearity properties, dielectric losses and breakdown. As shown in this paper de-poled PZTs have lower permittivity and dielectric losses compared to poled ones and BT (Barium Titanate) ceramic dielectrics. This was confirmed by measuring the permittivity, polarization curve and, tangent loss (δ) of this material. As discussed...
In this paper we have demonstrated a novel approach for actuation and read-out of resonating sensors. In this approach, instead of reading the amplitude of the resonating beam in resonance, we use the frequency of the beam as a measure of the sensors response. By using a bidirectional amplifier a pulse is sent to a resonating sensor in one direction and the frequency response of the sensor is measured...
Wireless charging is a safe and clean technique of contactless charging over a wide range of power levels for portable electronic products. Although the market for wireless charging in Watts to tens of Watts is growing rapidly, the performance of such wireless charging products is still inferior when compared to those utilizing traditional charging, especially when the resonant frequencies are not...
Electrostatic charge measurements are at the base of chemical, physical and biological experiments. In this work the authors present an electrometer based on the vibrating capacitance of a microelectromechanical (MEMS) micromachined resonator. We present improvements on the low-noise readout amplifier by reducing input-referred voltage noise and parasitic capacitances. An amplifier has been designed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.