Mechanical stoppers in MEMS capacitive systems can dramatically affect electrical performances and result complicated mechanical dynamic responses. This paper introduces electromechanical coupling nonlinear responses variable dual-capacitor with an effect of asymmetrical stoppers. We found that the capacitance circuit system related to first-order derivative output voltage on a load resistor, w...

In this paper, a new voltage controlled first order all-pass filter is presented. The proposed circuit employs a single differential voltage dual-X second generation current conveyor (DV-DXCCII) and a grounded capacitor only. The proposed all-pass filter provides both inverting and non inverting voltage-mode outputs from the same configuration simultaneously without any matching condition. Non-...

This paper proposes a Micro-electro-mechanical (MEMS) capacitive pressure sensor that relies on the movable electrode displaced like a flat plate equal to the maximum center deflection of diaphragm. The diaphragm, movable electrode and mechanical coupling are made of polysilicon, gold and Si3N4, respectively. The fixed electrode is gold and the substrate is Pyrex glass. This proposed method inc...

Tunable leaky-mode resonant silicon-nitride pixels providing red/green/blue spectral lines are analyzed. Critical dimensions, rate of tuning, linewidths, and polarization properties are quantified. ©2007 Optical Society of America OCIS codes: (050.1950) Diffraction gratings; (310.2790) guided waves; (120.2440) filters. Microelectromechanical systems (MEMS) methods are useful for tuning the spec...

Narrow band Low Noise Amplifiers (LNA) use inductors for band selection and input matching to reduce power consumption and reduce thermal noise generation. The LNA amplifies all signals within its fixed band, including blocking signals. This requires a larger dynamic range from the rest of the front end (mixers and analog to digital converters (ADC)). This paper presents a solid state active in...

A bandwidth-tunable filter has been demonstrated based on a micro-electro-mechanical-system (MEMS) actuated single-crystalline silicon microtoroidal resonator. Bandwidth is tuned from 2.8 to 78.4 GHz by voltage control, the largest bandwidth tuning range reported to date to our knowledge in resonator-based filters. A 21.8 dB extinction ratio is attained as a dynamic add-drop filter.

We present an approach for manipulating light in an optical fiber where efficient modal field interaction is achieved between modes propagating in an air-silica microstructure optical fiber and micro-fluids incorporated in the air-holes of the fiber. We demonstrate this apporach in terms of applications to tunable devices.

Micro-Redoxcapacitors The choice between the battery or capacitor has long been a standing dilemma, involving sacrifices of either power energy density. For systems that require combined high capacity and rate performance, use both batteries capacitors is inevitable, hindering reduction in complexity, size, cost. In article number, 2111805, Haibo Hu, Derek Ho, co-workers show new device categor...

BAWA, GAURAV. A Switched Capacitor based Micro-stimulator for Deep Brain Stimulation. (Under the direction of Dr. Maysam Ghovanloo and Dr. Leda Lunardi.) This thesis presents a novel technique for the development of an implantable stimulator for Deep Brain Stimulation. The key idea is to harvest energy from an inductive link using an efficient switching mechanism at the secondary side. To valid...