Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"Preamplifier"”.
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Low-noise preamplifier for capacitive sensors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Development of a CMOS preamplifier for single ended mangetoresistive heads
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Measurements, analysis and modeling of the performance of direct detection receivers with an optical preamplifier
… optical fiber communication systems. In the preamplifier configuration, a bandpass filter is required to reduce the amplified spontaneous emission (ASE) noise in order to provide satisfactory bit error ratios (BER). In this thesis we examine the influence of the filter characteristics on …
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CMOS Readout Interfaces for MEMS Capacitive Microphones
… dissertation consist of a front-end, which is a preamplifier, and a backend which converts the output of the preamplifier into a digital representation. The first interface presents a bootstrapped preamplifier and a third-order sigma-delta modulator (SDM) for analog-to-digital conversion. The …
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Ultrasound Microscope with Arbitrary Coded Broadband High Frequency Signal
… switch, a microcontroller trigger device, and a preamplifier. Our signal source based on quadrature I-Q modulator modulates a high frequency signal with low frequency arbitrary signals and produces a high frequency arbitrary signal. This signal source gives more than 200 MHz bandwidth in center …
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Analysis, Design and Performance Evaluation of Optical Fiber Spectrum-Sliced WDM Systems
… first time in this work, is to use an optical preamplifier receiver. It is shown that when an optical preamplifier receiver is used, there exists an optimum filter bandwidth which optimizes the detection sensitivity (minimizes the average number of photons/bit) for a given error probability. …
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Planar Coils for NMR Microspectroscopy
… investigated. The potential use of a low-noise preamplifier is also investigated.
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A modulation-doped field-effect transistor-based optoelectronic integrated circuit receiver for optical interconnects
… communication system is the optical receiver/preamplifier which converts the low-level optical signals into amplified electrical signals. This thesis describes the design, fabrication, and characterization of an OEIC receiver based on submicron pseudomorphic modulation-doped field-effect …
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Local Signal Processing of the ALICE Transition Radiation Detector at LHC (CERN)
… Detector signals are preamplified and shaped (Preamplifier and Shaper Chip, PASA). Thereafter they are converted from analog to digital and are processed (Tracklet Processing Chip, TRAP). This thesis describes the digital signal processing of the TRAP chip. The input signals are filtered …
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Fiber optic methods for nondestructive testing
… in aluminum and composite specimens. A broadband preamplifier is designed for amplifying signals from the EFPI sensor. Theoretical and practical minimum detectable air gap change of an EFPI sensor are calculated for the system. The directional sensitivity of the EFPI sensor to SAW is studied.
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Design of Ultrawideband Digitizing Receivers for the VHF Low Band
… so the efficiency of power transfer to the preamplifier needs to be carefully considered. This thesis takes these design challenges into account and produces a seven step design methodology for direct sampling wideband digitizing receivers. The methodology is then demonstrated by example for …
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Simulating scanning tunneling microscope measurements
… for vibration isolation or for top-of-the-line preamplifiers that can be placed at low temperatures. This thesis presents a simulation of the STM measurement chain, from tunneling tip to computer control. The goal is to see how noise at different stages of the measurement chain affect the output …
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Tunnel filters and optical amplifiers for use in fiber optic communication systems
… filter. Optical amplifiers used as a receiver preamplifier and as linear intermediate repeaters are evaluated. Performance parameters of particular interest are the receiver sensitivity and the total system gain. The effects of optical amplifier gain and bandwidth on those parameters are …
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Linearly repeatered communication systems using optical amplifiers
… direct detection systems with an optical preamplifier are generalized for the cases of frequency-shift keying and subcarrier modulation. Our results, obtained by using the Gaussian approximation, are compared to those obtained by an 'exact' analysis. The results are also generalized for …
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Listening to neurons - development and understanding of microelectrode arrays (MEA's) systems
… the 'bathtub', the mould of Jude pattern and the preamplifier) are described in the second chapter. Chapter 3 gives the detail of the designs of these devices and how they were evolved and optimised. Chapter 4 is about the impedance model of the microelectrode, the measurements of the impedance …
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Comparator design and analysis for comparator-based switched-capacitor circuits
… low-noise threshold detection comparator using a preamplifier is discussed.
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Spectral Computed Tomography at High Photon Fluxes
… the IKrum current in the charge sensitive preamplifier, which corresponds to reducing the pulse shaping time. The negative impact of this procedure on the detector’s spectroscopic performance seems only moderate. Furthermore, the deviation from an ideal linear response is determined as a …
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SOA enhanced optical line terminal for future optical access network
… to achieve high dynamic range using an SOA preamplifier, and that simple linear equalisation is sufficient to compensate for low-cost 25G-class receiver bandwidth limitations and moderate fibre dispersion in IM/DD systems. To explore manufacturable integration, a transfer-printed SOA …
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Das Lichtpulsersystem des elektromagnetischen CsI(Tl)-Kalorimeters des Babar-Detektors
… of the calorimeter into the detector where the preamplifier electronics is inaccessable for repair. In monitoring the short term performance of the light pulser system, the stability over one week is better than 0.15 %. Over six months between February and August 2000 the crystal response, as …
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Development and Characterisation of a Radiation Hard Readout Chip for the LHCb-Experiment
… The front-end consists of a charge-sensitive preamplifier and a CR-RC pulse shaper. It features an equivalent noise charge of ENC = 497 e + 48.3 e/pF Cin. The analogue memory is a switched capacitor array, which provides a latency of max. 4 us. The 128 channels are transmitted off chip in 900 …
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