In this work a new design of a t u n a b l e c a p a c i t o r b a s e d o n microelectromechanical system (MEMS) technology is presented. The design of high Qtunable capacitor has been accomplished through bulk micromachining process with all metal microstructure. A standard IC fabrication process (HP.5μ) is used to carry out the tunable capacitor. The main features of this high-Q MEMS tunable...

A new technique to measure a capacitor or a capacitive sensor by means of a direct sensor-to-microcontroller interface circuit that does not need a calibration capacitor is proposed. Basically, the measurement process consists of three consecutive steps of charge, discharge and charge of the capacitor under test. A non-linear equation is obtained and solved that is dependent only on known circu...

Lecturer, Department Of Electrical Engineering, L. E. College Morbi-363642, India, ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract -This paper presents application of flying capacitor multi level inverter in high voltage shunt active power filter. The proposed strategy uses three independent mul...

Nowadays, because of the need to decrease fuel consumption and greenhouse gas emissions and also their capability of exchanging power with the grid and regulating the frequency and voltage of the grid at different times of the day, electric vehicles are used more than before all across the world. It is highly important to pay attention to the efficiency, and decrease in the weight and volume of...

Design of switched capacitor circuits in scaled CMOS technologies is becoming difficult because of low device intrinsic gain and reduced power supply voltage. To solve these problems, comparator-based switched-capacitor (CBSC) circuits and zero-crossing based circuits (ZCBC) were suggested as a possible solution to the op-amp based circuits. In this thesis, we explore zero-crossing based circui...

The variation of inductance with frequency in high performance power distribution grids is discussed in this paper. The impedance characteristics of the power grid need to be well understood for the design of efficient and robust high performance power distribution grids. The physical mechanisms underlying the dependence of inductance on frequency are discussed. The variation of inductance with...

The entire framework of microtubules (MTs) in the mitotic apparatus of Ochromonas danica is reconstructed (except at the spindle poles) from transverse serial sections. Eleven spindles were sectioned and used for numerical data, but only four were reconstructed: a metaphase, an early anaphase, a late anaphase, and telophase. Four major classes of MTs are observed: (a) free MTs (MTs not attached...

Impedance spectroscopy has the potential for label-free integrated electrochemical detection in microfluidic lab-on-a-chip applications. Its capability to identify and discern between surface and bulk processes in solid-liquid systems finds particular use for the detection of biorecognition events or conductivity measurements. The electrochemical transducer can be in the form of interdigitated ...

A compact nanosecond pulse generator was designed and tested. The generator has a specially designed unit consisting of an HCEIcap 1000.2 capacitor and a multigap switch. The total inductance of the unit is 20 nH. The modifications made in the design allowed an increase in energy density up to 370 J/l at an electric field strength of 200 kV/mm. The volume of the capacitor active part is 2.3 l. ...

This work focuses on the estimation of the Remaining Useful Life (RUL) of aluminum electrolytic capacitors used in electrical automotive drives under variable and nonstationary operative conditions. The main cause of the capacitor degradation is the vaporization of the electrolyte due to a chemical reaction. Capacitor degradation can be monitored by observing the capacitor Equivalent Series Res...