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Showing 1 to 11 of 11 for “"Charge Amplifier"”.
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Design of a Surgically-Viable Umbo Microphone For Implantable Assistive Hearing Devices
… umbo motion together with a signal conditioning amplifier is presented. The output of the system ultimately drives a cochlear implant. The microphone takes the form of a 3-mm-diameter drum pressed by the umbo in which the drum head is piezoelectric PVDF. The amplifier is a lowinput-impedance …
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Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors
… components of the system. These components are charge amplifier, high pass filter, low pass filter and line driver. A charge amplifier converts a high impedance signal to a low impedance signal. A high pass filter attenuates the low frequency content of a signal, while a low pass filter …
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A Fully-Implantable Low-Noise Emi-Resistant Piezoelectric-Polymer Microphone and Amplifier for the Middle Ear
… polymer, as well as a low noise differential charge amplifier designed for small capacitance sensors. The amplifier and sensor combination has a noise floor of 385 e− (0.062 fC) over its bandwidth of 100 Hz to 20 kHz, equivalent to 0.015 nm of displacement. When implanted, we achieve a …
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Magnetoelectric Device and the Measurement Unit
… Component selection strategies and a new charge topology were considered. Proper component values were required to optimize the charge detection scheme. It was also found, under some specific conditions to satisfy the circuit stability, that if the lowest required measurement frequency of …
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An Intracochlear Hydrophone and Amplifier
… (PVDF-TrFE) intracochlear hydrophone and amplifier system for high-bandwidth sensitivity, surgical viability, and improved SNR by electrical shielding and circuit design. Our analysis shows that the copolymer PVDF-TrFE should be used due to its higher hydrostatic sensitivity, the sensor …
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The development of poly(vinylidene fluoride) piezoelectric sensors for measuring peel stresses in adhesive joints
… film were accurately measured using a charge amplifier and a storage oscilloscope. These measured sensitivities comprised the calibration constants of the film. In order to reduce the detrimental effect on bond strength caused by embedding the low surface energy film into adhesive …
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In situ monitoring of reactive ion etching using a surface micromachined integrated resonant sensor
… during the RIE process. A capacitive feedback charge amplifier interface circuit, when configured with the RIE senor at the input achieves very low noise sensing of capacitance changes and offers the potential for wide dynamic range and high sensitivity. As an application vehicle, process …
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Characterization, Modeling of Piezoelectric Pressure Transducer for Facilitation of Field Calibration
Currently in the marketplace, one of the important goals is to improve quality, and reliability. There is great interest in the engineering community to develop a field calibration technique concerning piezoelectric pressure sensor to reduce cost and improve reliability. This paper summarizes the …
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Magnetoelectric (ME) composites and functional devices based on ME effect
… magnetic sensor has undergone a redesign of the charge amplifier circuit. Additionally, the noise model has been established to simulate the noise density for this device which can predict the noise floor precisely. Based on theoretical noise analysis, the noise floor can be eliminated greatly. …
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Fabrication of reliable, self-biased and nonlinear magnetoelectric composites and their applications
… of a Metglas/PMN-PT laminate and a low noise charge amplifier, had a magnetic field sensitivity of 10 pT/Hz0.5 in a well-shielded environment. Stacking four of these ME laminates could further increase the signal-to-noise (SNR) ratio. I studied the optimized distance between a pair of …
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Responsive temperature and pressure sensor design for in-situ prosthesis monitoring applications based on the piezoelectric and pyroelectric effects in lead zirconate titanate
… temperature dependent and therefore charge-mode signal conditioning was chosen to mitigate temperature effects on the signal-conditioning response. Subsequent response measurements were found to yield a linear response over the temperature range of interest. Bipolar and unipolar …