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 37 for “"analog signal."”.
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Analog Signal Processing Elements for Energy-Constrained Platforms
… architecture has direct application in the analog as well as the digital domain. Indeed, research shows that as the resolution of a signal processor falls below a system-dependent threshold, it is almost always more efficient to preform the processing in the analog domain. These …
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Space Communication Channel Emulation Using Digital and Analog Signal Processing
… and reconstructing the digital data to its analog counterpart. Delay, Doppler shift, Gaussian noise, and fading are among the most prevalent characteristics of such a channel, and thus were the focus of this thesis. Special care was given to the design of each digital and analog component to …
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Low cost analog signal processing for massive radio telescope arrays
… The primary time of interest corresponds to a signal in the the 100-200MHz frequency band. The Omniscope is a new type of radio telescope array being developed at MIT which images the entire sky in this band at low resolution using spatial Fourier transforms. In order to gain the maximum …
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Reconfigurable Discrete-time Analog FIR filters for Wideband Analog Signal Processing
… is the implementation of wideband and flexible signal processing in communication and sensing applications. Although software defined radio (SDR) is a possible solution, it may not be practical due to the excessive requirements for analog-to-digital converter (ADCs) and digital filters for …
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Power-Efficient Voltage-Mode RF Front-End Using Quantized Analog Signal Processing
… the overall power consumption of both the signal and local oscillator (LO) paths. My contributions to the state-of-the-art SAW-less receivers for my PhD addresses the abovementioned issues and can be summarized in the following major points: 1) for the first time, voltage-mode approach was …
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Optimal and Permissible Sampling Rates for First-Order Sampling of Two-Band Signals
… an essential role in the advancement of digital signal processing (DSP). All known DSP processors only work with digital samples of an analog signal (continuous-time signal). Therefore, reliable sampling of a signal is crucial for the successive phases of DSP. A well-known industry standard for …
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Analog multiply and accumulate FPA readout circuit with digital multiply and sign maintenance
… is presented. The system is comprised of an analog signal processor that will be integrated into the read out integrated circuit. This enables the capability to read out the focal plane array information and process it completely in the analog domain in a comparably very small amount of …
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Digital signal processing hardware for a fast fourier transform radio telescope
… in the universe's history. The nature of the signal measured in 21-cm tomography is such that a new kind of radio telescope is needed: one that scales well into very large numbers of antennas. The Omniscope, a Fast Fourier Transform telescope, is exactly such a telescope. I detail the …
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A reconfigurable analog-to-digital converter for a mobile receiver
… rates. The boundaries between digital and analog signal processing is impending closer to the antenna, therefore aiming for a software-defined radio solution. In terms of analog-to-digital converters (ADCs) of mobile terminal receivers, this indicates higher sample rate, lower power …
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A test of parity conservation in proton-proton scattering at 15 MeV
… at a 1 kHz rate. The experiment used analog signal processing; the corre1at1.on between the cross section and the beam he1icity was measured using a phase-locked amplifier. The means for rapidly reversing the beam polarization and the methods for reduction of systematic errors are …
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A high speed wearable system for body coupled communication
… ideal methods by which doctors can read bodily signals detected by implanted devices. Methods are either too high power for long-term implants, such as radio transmission, or pose health threats to the patient, such as connection ports piercing the skin. However, a novel method of transmitting …
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Synthetic biological circuits for continuous signal processing
… cells will need to be capable of similar signal processing and computation in order to operate efficaciously in complex environments, like the human body. In this thesis I describe the development of synthetic biological circuits that enable such capabilities. In the first chapter, analog …
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Design of a low power switched-capacitor pipeline analog-to-digital converter
<p>An Analog to Digital Converter (ADC) is a circuit which converts an analog signal into digital signal. Real world is analog, and the data processed by the computer or by other signal processing systems is digital. Therefore, the need for ADCs is obvious.</p><p>In this thesis, several novel …
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Passive switched-capacitor based filter design, optimization, and calibration for sensing applications
… are reviewed. An RF sampler followed by analog signal processing is identified as a critical block enabling low-power wideband digitization. Passive switched-capacitor charge-domain processing is introduced. Its implementation simplicity and lack of active power consumption are enticing. …
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Design And Development Of An Autonomous Radar Receiver For The Detection Of Ultra High Energy Cosmic Rays
… accomplish radar echo detection using an analog signal chain. Subject to less radio interference, the remote stations add stereoscopic measurement capabilities that theoretically allow unique determination of cosmic ray geometry and core location. An FPGA is used as a distributed data …
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Hardware intrusion detection for supply-chain threats to critical infrastructure embedded systems
… system. This technology combines the use of an analog signal response from a resistor-capacitor circuit and machine learning techniques to not only identify the presence of a hardware Trojan on an inter-chip communication bus at 100% accuracy for the dataset of over 2000 measurements, but which …
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Development of the in vivo flow cytometer
… proportional to their velocity. The fluorescence signal is detected through a confocal slit aperture using a photomultiplier tube. The analog signal from the photomultiplier tube is then digitized, filtered, and recorded as a function of time onto a computer. Computer programs post- process the …
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An Algorithm and System for Measuring Impedance in D-Q Coordinates
… An eight-layer PCB was constructed implementing analog signal conditioning and conversion to and from digital signals with high resolution. The PCB interfaces with the existing Universal Controller hardware. Chapter 4 discusses the analyzer software. Software was written in C++, VHDL, and Matlab …
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An AFE based embedded system for physiological computing
… of such systems entails discrete sensors and analog sub-systems known as the analog front end (AFE) for biosignal acquisition, conditioning, and vital bridging function. Being discrete and analog, signal processing is limited. Besides, with large form factor, component counts and power …
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