We present the design of tunable capacitor based on MEMS simulated using COMSOL Multiphysics, which is an emerging engineering software environment used for modelling and simulation of any physical based structure. This model includes an electrostatic simulation for a given distance component in various microelectromechanical systems (MEMS) for electromagnetic fields in the radio frequency rang...

A new CMOS fully differential bandpass amplifier (BPA) based on the structure of a transresistance (Rm) amplifier and capacitor is proposed and analysed. In this design, the Rm amplifier is realised by a simple inverter with tunable shunt-shunt feedback MOS resistor and tunable negative resistance realised by crosscoupled MOS transistors in parallel with a current source. The capacitor is in se...

this paper presents design and simulation of tunable microwave capacitor based on microfluidic actuation. The structure modeling shows an important variation of electric field and current distribution following the DI water displacement in microchannels. In addition, the capacitance value is comprised between Cmin = 0.11 pF and Cmax = 5.76 pF allowing a very wide variation that reaches Tr = 513...

This paper investigates the fault detection of a micro parallel plate capacitor subjected to nonlinear electrostatic force. For this end Thau observer, which has good ability in fault detection of nonlinear system has been presented and governing nonlinear dynamic equation of the capacitor has been presented. Upper and lower threshold for fault detection have been obtained. The robustness of th...

The proposed photovoltaic Micro Inverter is based on three port flyback with one port dedicated to power decoupling function so the decoupling capacitance is reduced and hence the long lifetime film capacitor is used. One of the two transformers and one capacitor is used for decoupling function. The decoupling capacitor functions as energy storage as well as snubber capacitor to recycle the tra...

Future microwave networks require miniature high-performance tunable elements such as switches, inductors, and capacitors. In this paper, high performance variable capacitor was fabricated by simple microelectromechanical systems (MEMS) technology. The capacitance and quality (Q) factor at 1 GHz are 0.792 pF and 51.6. The pull-in voltage is 13.5 V and the tuning ratio of the capacitor is more t...

We present a micro electromechanical tunable capacitor with a low control voltage, a wide tuning range and adequate electrical quality factor. The device is fabricated in a single-crystalline silicon layer using deep reactive ion etching (DRIE) for obtaining high-aspect ratio (> 20) parallel combdrive structures with vertical sidewalls. The process sequence for fabrication of the devices uses o...

The K-band microelectromechanical systems (MEMS) tunable band-pass filter, with a wide-frequency tunable range and miniature size, is able to fulfill the requirements of the multiband satellite communication systems. A novel 21.69–24.36 GHz MEMS tunable band-pass filter is designed, analyzed, fabricated and measured. This paper also designs and analyzes an inductively tuned slow-wave resonator,...

This paper proposes the design of a tunable radiofrequency filter based on the switched capacitor techniques. This circuit, which can replace high-Q external passive filters, allows a high selectivity with a tunable center frequency range of 400 MHz [700-1100 MHz], with quality factor up than 1100. Implemented in 0.18 μm CMOS technology, this circuit is intended to be used for the next generati...

Single-ended and differential operational transconductance amplifier (OTA) configurations are biased with MOSFET interface-trap charge-pumping (ITCP) current generators to achieve very low transconductances for tunable sub-hertz operational transconductance amplifier-capacitor (OTA-C) filter implementation. This paper reviews the basics of ITCP current generation and presents the transconductor...