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This paper presents the characterization of frequency response and mode shape at the 1st harmonic frequency of a Micro-Opto-Mechanical Acoustic Sensors (MOMAS) with a Mach-Zehnder Interferometer (MZI) readout system. In previous research, the static modeling and characterization has been demonstrated. In this paper, we investigate the capability of using MOMAS in ultrasound domain as a Micro-Opto-Mechanical...
The natural swinging filter inductance due to core's magnetic permeability can affect control stability. Conventional control methods generally adopt larger cores to avoid this issue. Division-Summation (D-Σ) digital control, on the other hand deals with the problem by including this filter inductance variation in the control law. It allows the use of much smaller core than conventional control methods...
A log-periodic antenna for intrinsic Josephson junction (IJJ) terahertz (THz) emitter is investigated. The IJJs are designed as a microbridge fabricated with misaligned superconducting thin film deposited on the MgO substrate. By adjusting the dimension of the substrate in the electromagnetic simulation, an optimized structure is obtained for the IJJ THz emitter at 0.34 THz. Moreover, a hemispherical...
This paper investigated pH measurements using ZnO based Surface Acoustic Wave Resonator (SAW). The resonant frequency of the SAW decreased as pH changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H3O+) or hydroxide (OH−) and ZnO was proposed...
This abstract describes room temperature ozone sensing using a ZnO based film bulk acoustic resonator (FBAR). The resonant frequency of the FBAR decreased upon ozone exposure due to the density increase of the ZnO film. Ozone can be adsorbed on the ZnO surface by capturing free electrons from the film, which increases the film density. The minimum detectable concentration is 21 ppb (parts per billion)...
This paper describes the new design and material selection used to improve the sensitivity of ionizing radiation sensing with a zinc oxide based Film Bulk Acoustic-Wave Resonator (FBAR). Prior results [1] demonstrated that the parallel resonant frequency of the FBAR decreased after irradiation due to radiation-induced charge trapping in the SiN. Here, by employing Plasma Enhanced Chemical Vapor Deposited...
A new wide locking range injection-locked frequency divider (ILFD) using a standard 0.18-mum CMOS process is presented. The ILFD is based on a differential voltage controlled oscillator (VCO) with two embedded injection metal oxide semiconductor field effect transistors (MOSFETs) for coupling external signal to the resonators. The new VCO is composed of two single-ended VCOs coupled with cross-coupled...
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