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 75 for “"low-pass filter"”.
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Rf Low Pass Filter Design And Fabrication Using Integrated Passive Device Technology
In this thesis, the whole process of design a low pass filter (LPF) for the wireless communication application has been presented. Integrated passive device technology based on GaAs substrate has been utilized to make the LPF. Schematic simulation and electromagnetic simulations are extensively …
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Phased-locked loop study, simulation, and design of adaptive filter
… the etfeet on phase-locked loop operation of the pass band or the low-pass filter in the loop. From the findings, it was concluded that when the loop was out of lock, the pass band of the low-pass filter should be wide; however, when the loop was locked, the pass band of the low-pass filter should …
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Class E amplifiers and their modulation behaviour
… assumed that it can be modelled as a first order low pass filter. It is shown that Class E AM can be modelled as an equivalent circuit, which behaves as a second order low pass filter. Measurements confirm the analysis.
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Design of efficient digital interpolation filters for integer upsampling
… cascades an expander unit with an interpolation low-pass filter. More complex implementations can cascade multiple expander and low-pass filter pairs. There is also flexibility in the design of interpolation filters. This thesis explores how digital interpolation systems for integer upsampling …
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Predictive Control For Dynamic Systems To Track Unknown Input In The Presence Of Time Delay
… stable when input signal is rather low frequency signal. In order to illustrate the system performance, simulations are done based on the data profile technique. Signal profiles including acceleration pro le, velocity pro le, and trajectory profile are listed. Based on these …
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CMOS integrated commutated circuits for interference filtering at radio-frequency
Two ways of interference filtering, namely mixer-first receiver with acoustic filter load and N-path low pass filter (LPF), are presented and verified. The passive mixer-first architecture provides high linearity and reconfigurability. The acoustic load at intermediate frequency ensures good …
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MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING
… to be emitted as noise. The vibration energy flow can be disrupted, for example using a hydrostatic bearing as a low pass filter of vibrations while still preserving the positioning accuracy of the gear drive.</p><p>Hydrostatic bearings are a class of fluid bearings consisting of externally …
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Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors
… uses the principles of active lamb wave and passive acoustic emission through the use of piezoelectric sensors as the sensing elements. Piezoelectric sensors can be used both as an input device and as a sensing element. This research focuses on the development of the major data acquisition …
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Autonomous navigation with mobile robot using ultrasonic rangefinders
… with PWM signals based on sensor feedback. A low-pass filter was used to improve the signal to noise ratio since the signals from the ultrasonic sonar sensors were quite noisy. Finally, I developed two basic algorithms to maneuver the mobile robot: the first algorithm uses proportional control …
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Tutorial on designing and implementing a direct digital synthesizer (DDS) on a field programmable gate array (FPGA)
… a digital-to-analog converter (DAC) or a low-pass filter. Using a Virtex 6 design for the FPGA, one can achieve close to perfect sinusoids, without any phase change, with varying frequency tuning words (FTWs).
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Embedded machine vision - a parallel architecture approach -
… logic and memory resources. Specifically, the low pass filter, edge detection and thresholding algorithm are designed with the aim of processing a pixel within a single clock cycle. To achieve minimal usage of hardware resources, the redundant memory locations, logics and computations are …
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State estimation for a holonomic omniwheel robot using a particle filter
… robot platform was designed to use a Particle Filter to estimate state. The motor controller was developed to control robot vectoring and report odometry, and noise analysis on an absolute positioning system, Ubisense, was performed to characterize the system. High frequency noise confounds the …
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Unrolling of Graph Total Variation for Image Denoising
… a hybrid design that combines graph signal filtering with feature learning is proposed. It utilizes interpretable analytical low-pass graph filters and employs 80\% fewer parameters than a state-of-the-art DL denoising scheme called DnCNN. Specifically, to construct a graph for graph …
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A study of multilevel partial response signalling for transmission in a basic supergroup bandwidth
… at the demodulator. A sixth order Butterworth low pass filter approximates the ideal raised-cosine Nyquist channel. A theoretical discussion on impairments caused by deviation from this channel is given. Since the experimental system was non-ideal, it produced a degradation in the channel …
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Macromodeling and demonstration of the LT6600 amplifier and lowpass filter
… abilities of the Sevastopoulos-LaPorte active low-pass filter topology in Linear Technology Corporation's LT6600 integrated circuit (IC). The thesis is split into two parts, representing two facets of how engineers will evaluate the LT6600: by simulation and in the laboratory. The LT6600-10 …
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A Reliable CMOS Receiver for Power Line Communications in Integrated Circuits
… through measurements the existence of pass-bands in the power distribution networks and the feasibility of power line communications in ICs. Several PLC receivers were developed to recover data superimposed on the power lines of an IC. This thesis research investigated a new PLC …
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Design of high fidelity pulse width modulation inverter
… switching function for a bridge inverter, and a low-pass filter extracts the audio. Meanwhile, this process is nonlinear. So it has often been assumed that implementation of PWM in audio benefited us with its efficiency improvement at the price of distortion. This work explored how PWM can be …
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All-Digital Audio Amplifier
… amplified by a switching power stage and finally low-pass filtered before it is sent to a speaker. The purpose of the digital signal processing (DSP) portion of the system is to transform the original audio information into a feasible, low-level PWM signal, with minimum possible degradation. The …
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Neural Network Learning for Time-Series Predictions Using Constrained Formulations
… noise. We incorporate constraints on predicting low-pass data in the lag period when a low-pass filter is employed to denoise the band. The new constraints enable active training in the lag period that greatly improves the prediction accuracy in the lag period. Extensive prediction experiments on …
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Architectural Improvements Towards an Efficient 16-18 Bit 100-200 MSPS ADC
… spectral shaping of mismatches. With a simple low-pass filter the method can, compared to conventional randomization algorithms, improve the SFDR as well as the SINAD. The main advantage of this technique over previous ones is that, because the algorithm only need that ADCs are ordered basing …
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