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The aim of this paper is to present a very simple, cheap and practical experimental technique that is able to estimate capacitors equivalent circuit for a wide range of frequencies. Capacitors equivalent circuit changes with temperature, aging and frequency. Thus, since capacitors have a wide range of applications, particularly in power electronics applications, the knowledge of their model at their...
A high input impedance electronically tunable voltage-mode biquadratic filter with single input and three outputs using four simple CMOS operational transconductance amplifiers and two grounded capacitors is proposed. The proposed filter provides low-pass, band-pass and high-pass voltage responses at a high input impedance terminal, which enables easy cascadability of the voltage circuit. Also, the...
Due to its restricted usage and accuracy in measuring extremely short interval of time, TDC (time to digital converter) embedded measurement devices are relatively expansive. Even if new applications are being developed in daily life as well as in industry, the cost condition of TDC based measurement systems needs to be improved. To reduce the deployment cost on a commercial scale, analogue interpolation...
This paper presents a simple technique to realize floating inductance simulators using commercial and low-cost devices. Both negative and positive floating inductances can be obtained in the same scheme without stability problem. The realization method based on the use of operational transconductance amplifiers (OTAs) and one grounded capacitor provides the advantage of an electronic tuning capability...
A new calculable capacitor with an operating range of 0.1 pF is being developed at NIST. Reduced uncertainty for displacement measurements, enabled by employing tunable laser based Fabry-Perot interferometers, will allow a considerably more compact design, minimizing errors from mechanical sources. Using 3-D electric field simulations, we have also estimated errors resulting from mechanical imperfections.
This paper addresses the representation and the characterization of the electrostatic behavior of n-windings HF power transformers. A global approach, mainly based on energy considerations about linear electrostatic circuits, is introduced. It leads to equivalent circuits which include minimum numbers of elements. Besides, owing to a special approximation that is often acceptable, the general circuit...
This paper proposes the use of Vernier technique to improve the performance of direct interface circuits based on measuring the charging or discharging time of an RC circuit that includes the sensor. The proposed Vernier technique either improves the resolution determined by quantization of the digital timer or reduces the cost, measuring time, and power consumption of the circuit while preserving...
In this work, the design of a Time-to-Digital Converter (TDC) for measuring the time-of-flight (ToF) of a radio pulse is described. It consists on two blocks: a time-to-voltage transducer, whose scheme is that of a charge pump, designed using a 0.25 mum CMOS process, and an incremental first order sigma-delta (SigmaDelta) converter. The two blocks are connected together by means of a sample and hold...
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