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 20 of 23 for “"Active filters"”.
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Digitally controlled "programmable" active filters
… which are known for their high stability and low active and passive sensitivity. CMOS switches are used to electronically relocate the minimum number of passive elements to achieve function programmability. Switches are also used to select the number of cascaded sections to realize higher order …
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Active filters for biological signal analysis
… domain is the subject of this paper. Several filters were constructed and the results of a particular filter were analyzed. The problem of obtaining a constant power spectrum when a signal is divided into a number of bands by bandpass filters was investigated. This is very important in …
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Design and implementation of three-phase four-wire active filters
… as are found in standards such IEEE-519. Passive filters have been used to limit the flow of harmonic currents in distribution systems. However, these tend to be bulky and the design is complex, particularly if the number of harmonic components to be reduced increases. With improvements in power …
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Synthesis of Multiple-Loop Feedback Switched-Capacitor Structures (Active Filters)
In this dissertation a new switched-capacitor (SC) design technique is presented. The design method is based on a building block approach where the desired transfer function is realized in a multiple-loop feedback (MF) topology by interconnecting parasitic-insensitive SC circuits. The SC structures …
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A STUDY OF ACTIVE FILTERS FOR HARMONIC AND REACTIVE POWER COMPENSATION
In this thesis, several aspects of an Active Power Filter (APF) system are studied. The theoretical background of active power filtering is evaluated, including several methods of harmonic current extraction, analysis of the shape of the de-link voltage of the APF and its response to external …
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Active filters for 1 MHz power circuits under strict ripple limitations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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Photonic integrated circuit for the manipulation of coherent optical combs
… is trying to achieve. Much work was done with active filters during the 1980s. This involved using a laser device (usually below threshold) to allow selective wavelength filtering of input signals. By using more complicated cavity geometry devices such as distributed feedback (DFB) and sampled …
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Tunable Optical Group Delay in Active Semiconductor Optoelectronic Devices
… optical effects on the delay provided by active filters are then discussed. The nonlinear transmittance spectra of a Fabry-Perot amplifier are measured, and the results are accurately predicted using a self-consistent model. The model is then used to predict the corresponding delay spectra …
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Controlling harmonic distortion in power electronics using active power filters
… quality, system performance, and efficiency. Active harmonic filters have gained attention due to the decreasing price and improved availability of power electronics.This thesis discusses some of the conventional methods for correcting harmonic distortion using shunt-connected pure active …
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Emergence and fate of iodinated organic compounds and disinfection by-products during biological treatment of oil and gas produced water
… water reuse can be implemented. Biological active filters (BAFs) are one treatment technology that can be effectively used as pre-treatment of O&G wastewater to remove organic matter and reduce fouling in downstream membrane treatment processes for desalination. Because O&G wastewater is …
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Energy flow in nonlinear circuits
Apparent power and reactive power are two critical quantities in energy flow studies in electrical power systems. Existing definitions for these terms work well when both voltages and currents are sinusoidal with respect to time. However, both apparent and reactive power have no physical meaning. …
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Automatic Tuning Algorithms and Statistical Circuit Design
… of which is automatic tuning algorithms for active filters. Here the problem is that in order to meet response specifications these filters usually must be tuned or adjusted, preferably by computer automation if the production level is high. Three generalized tuning algorithms which have …
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Simulation of voltage source converter based shunt active filter in EMTP‐RV
… and distribution systems. Unlike passive filters, active filters are adaptable to rapidly changing source impedance and provide the necessary harmonic compensation for varying non-linear loads. This thesis models a Voltage Source Converter (VSC) based shunt active filter (SAF) to filter …
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Investigation of stability for composite operational amplifiers
… high frequency performance of conventional RC active filters · it became evident that theoretical predictions of stability and experimental results did not agree. Other publications concerned with composite operational amplifiers merely presented circuits where it was implied that these would …
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Modeling of voltage source converter based HVDC transmission system in EMTP-RV
… as STATCOM, SSSC, UPFC and Wind generators and active filters. The VSC based HVDC system is a feasible option for bulk power transmission over long or short distances and the grid integration of renewable energy sources in existing transmission and distribution systems. The main requirement in a …
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Tunable Filters and Interference Rejection System for Interferer Suppression at RF and Microwave Bands
… integration of high selectivity RF band-pass filters (BPF), or band-stop filters (BSF) is challenging because of limited quality factor (Q) of passive components in integrated circuit (IC) technology [1]. This proposed research achieves the followings: 1. Developing, and demonstrating …
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Design of Integrated, Low Power, Radio Receivers in BiCMOS Technologies
… and Gm-C based replacements for these filters, the resulting designs have yet to see substantial commercial application. A critical problem faced by existing active filter implementations is found to be the power consumption required to simultaneously achieve narrow fractional …
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Workload tools used in emergency departments: A scoping review
… and/or “assessment” and “safe staffing”. Active filters were “emergency department”, “patient”, “nurses” and “nursing". RESULTS 144 articles were identified. 54 additional articles were obtained through reference lists of the identified studies being hand searched for inclusion. 165 …
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Control of Harmonics in 6-Pulse Rectifiers
… Based on the system configuration either active filters, passive filters, or phase shifting methods are used. In medium voltage high power applications, generally, phase shifting method is better suited.</p> <p>In addition to harmonic distortion in AC side, AC-DC converter produce ripple …
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