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.
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Showing 1 to 10 of 10 for “"amplifier noise"”.
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Integrated Analog Readout Array and Digital Backend for Mobile DNA Sequencing
… version (DROICv1) employs a discrete-time (DT) amplifier with in-pixel successive approximation ADCs. The second version (DROICv2) increases throughput density using column-based ADCs. The third version incorporates an asynchronous reset amplifier, further enhancing throughput density by …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
… of the electromagnetic field, the substantial noise produced by standard amplifiers dominates the signal, therefore, several averages must be accumulated to achieve even a modest signal-to-noise ratio. Even worse, the back-action on the system due to amplifier noise can hasten the decay of the …
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Long distance dispersion managed soliton transmission experiments
… achieved low timing jitter by suppression of the amplifier noise and by working close to the zero dispersion wavelength has been discovered. The use of fibre Bragg gratings as wavelength filters to suppress noise and reduce timing jitter has been investigated. The performance of the fibre grating …
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The effects of noise in CATV distribution networks with star couplers and fiber amplifiers
Noise and distortion limit the channel capacity and degrade the system performance in AM-VSB SCM CATV Distribution Networks. The use of star couplers and fiber amplifiers is an approach to overcome these problems and meet the increasing demand for large capacity and high quality. The capacity and …
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The Impact of Antenna and RF System Characteristics on MIMO System Capacity
… is necessary. This work realistically models amplifier noise in the receiver and determines how matching networks may be used to improve system performance in the presence of antenna mutual coupling and amplifier coupling. Since MIMO systems operate by identifying optimal antenna array weights …
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Ultra-long haul optical fibre transmission systems
… reality. By augmenting such devices with optical amplifiers it is possible to greatly enhance the repeater spacing. Work detailed in this thesis has culminated in the propagation of 10 Gbit/s data over 400,000 km with a repeater spacing of 160 km. System reliability and robustness are enhanced by …
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Probing Symmetry and Disorder Effects in the Fractional Quantum Hall States of the Second Landau Level
… 4, I describe a new dc SQUID-based current amplifier which is capable of performing Johnson noise limited measurements in the fractional quantum Hall regime. An impedance matching transformer is placed at the input of a commercially available dc SQUID ammeter. This circuit exhibits an …
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Physics of Superconducting Travelling-Wave Parametric Amplifiers
Superconducting travelling-wave parametric amplifiers (TWPAs) are ultra-low-noise amplifiers that achieve amplification through the nonlinear kinetic inductance of superconductors. These devices can have near quantum-limited noise performance, and have important applications in quantum information …
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Silicon-Based PALNA Transmit/Receive Circuits for Integrated Millimeter Wave Phased Arrays
… optimization problem of switchless power amplifier/low-noise amplifier (PALNA) matching networks, which present optimal matching impedances to both the power amplifier (PA) and the low noise amplifier (LNA) while maximizing power transfer efficiency and minimizing dissipative losses in …
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High-Performance CMOS Front-End ASICs for SiPM Detectors and High-Frequency Ultrasound and Photoacoustic Imaging
… makes the timing measurement sensitive to noise and leads to poor timing resolution. Besides, the SiPM energy measurement utilizing charge-sensitive amplifiers suffers from high power consumption and is not suitable for array-based SiPM readout systems. To solve these issues, two hardware …