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 28 for “"Low distortion"”.
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A high bandwidth, low distortion, fully differential amplifier
An amplifier for use in driving an analog to digital converter in an ultra-wideband test system was designed and simulated. The amplifier has differential inputs and outputs and a bandwidth of greater than 500 MHz. According to simulation, the linearity for frequencies above 100 MHz is ten times …
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Efficient, low-distortion switch-mode power amplifier for amplitude modulation
… based disciplines. Typical systems have low-level signals which encode the desired information to be transmitted. These low-level signals are usually not of adequate power to transmit the desired information across a target medium, thus requiring modulation and power amplification. In …
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Approximation algorithms for low-distortion embeddings into low-dimensional spaces
… that minimizes the (standard) multiplicative distortion. For the same problem, we give an exact algorithm, with running-time exponential in the distortion. We complement these results by showing that the problem is NP-hard to [alpha]-approximate, for some constant [alpha] > 1. For the …
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Techniques for low distortion buffering of high speed switched capacitor ADC's
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Algorithmic embeddings
… efficient algorithms, and complexity results on low distortion mappings between metric spaces. An embedding between two metric spaces is a mapping between the two metric spaces and the distortion of the embedding is the factor by which the distances change. We have pioneered theoretical work on …
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High-voltage wideband switching amplifier for capacitive loads
… across a capacitive transducer with extremely low total power consumption and very low distortion.
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Quadrilateral Remeshing and Efficient Surface Parameterization
… framework that, can rapidly reduce interior distortion under a variety of metrics. By iteratively solving linear systems, our algorithm converges to a high quality, low distortion parameterization in very few iterations.
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Conductive cylindrical surface waveguides
… a surface wave in one dimension with low attenuation when the medium surrounding the surface waveguide has low attenuation. Additionally, surface waveguides guide a pure low-order mode with no cutoff frequency and low distortion, while higher-order modes are quickly attenuated. In this …
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Sound from ultrasound : the parametric array as an audible sound source
… suitable methods of ultrasonic synthesis for low-distortion audio reproduction. Geometrical modelling methods for predicting the acoustic distribution are presented and evaluated, and practical applications are explored experimentally. Issues of risk associated with ultrasonic exposure are …
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Constrained parameterization with applications to graphics and image processing.
… (also called foldovers). Additionally, distortion is inevitable in parameterizations. Thus the rigid constraint is always taken into account. In general, the constraints are application-dependent. This thesis thus focuses on the various constraints depended on applications and …
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Better embeddings for Planar Earth-Mover Distance over sparse sets
We consider the problem of constructing low-distortion embeddings of the Planar Earth-Mover Distance (EMD) into lp spaces. EMD is a popular measure of dissimilarity between sets of points, e.g., bags of geometric features. We present a collection of embeddings with the property that their …
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Increasing the Dynamic Range of Audio THD Measurements Using a Novel Noise and Distortion Canceling Methodology
… methodology for measuring Total-Harmonic-Distortion (THD) of operational amplifiers functioned when compared with two standard methodologies, and whether the new methodology offers any improvement in noise floor and dynamic range along with distortion canceling of the sine-wave source used …
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Linearity improvement technique for CMOS continuous-time filters
… element is applied in the implementation of low-distortion continuous-time filters in complementary metal-oxide-semiconductor (CMOS) technology. This work is motivated by the fact that to date, most of the techniques in continuous-time, electronically tunable filters perform quite poorly in …
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A high voltage, high current, low error operational amplifier with novel features
… by the individual stages, resulting in a very low (first-order canceled) overall input-referred voltage offset. Novel features are introduced which expand the functionality of the amplifier. Input stage gm is configurable, allowing for the tuning of amplifier bandwidth for a given gain …
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Adaptive Frame Fields for Polycube Generation and Quad Simplification
… good quality, the hexes must have relatively low distortion, and thus relatively simpler singular graphs, as singularities lead to distorted hexes. While frame field-based methods are not guaranteed to produce a hex mesh, they are excellent at simplifying singular graphs. In this thesis, we …
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Control, analysis, and design of distributed inverter systems
… inverter coordination methods such that system distortion is reduced and stability is maintained. In particular, a method of switch interleaving is developed such that the distortion generated by a system of inverters is canceled. This method is applied to series connected H-bridge inverters …
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Hyperbolic graph embedding of magnetoencephalography brain networks to study brain alterations in patients with subjective cognitive decline
… dimensional brain connectivity information to a lower dimensional latent space can allow quantitative analysis of the subtle changes in brain activity and create information-rich inputs to downstream classification tasks. Using a Hyperbolic Graph Convolutional Network (HGCN), we embed functional …
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Beam alignment and image metrology for scanning beam interference lithography : fabricating gratings with nanometer phase accuracy
… small diameter Gaussian laser beams to produce a low-distortion grating image, SBIL produces large gratings by step-and-scanning the photoresist-covered substrate underneath the image. To implement SBIL, two main questions need to be answered: First, how does one lock the interference image to a …
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Computational metric embeddings
We study the problem of computing a low-distortion embedding between two metric spaces. More precisely given an input metric space M we are interested in computing in polynomial time an embedding into a host space M' with minimum multiplicative distortion. This problem arises naturally in many …
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