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 15 of 15 for “"Local oscillator (LO)"”.
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Extensions of the Capabilities of a Balle-Flygare Microwave Spectrometer
… factor of 2 at high frequencies to about 100 at low frequencies. All of the electronics in the original instrument have been replaced. The sensitivity of the instrument has been improved substantially by the use of low-noise detectors and by elimination of internal sources of interference. This …
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CMOS bulk-driven mixers with passive baluns
… presented. Applying either the RF signal or the local oscillator (LO) signal to the bulk connection of the transistors allows the amplification and switching stages of a conventional mixer to be combined into a single stage, thus improving the voltage headroom of the mixer. The addition of a …
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An energy-efficient wireless data link for implantable electronics
Low-power wireless links are important for the development of long-term implantable neural prostheses. Furthermore, in implanted systems with many neural recording electrodes, the data rate of the wireless link will need to be quite high since each recording electrode can produce about 120 kbps of …
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Terahertz beam-steering imager using a scalable 2D-coupled architecture and multi- functional heterodyne pixels
… mature silicon platform. In the project, we developed the design method of a multi-functional heterodyne pixel and a scalable array architecture. The pixel is a compact electromagnetic structure simultaneously performs voltage-controlled 140 GHz local oscillation, 280-GHz-signal receiving, …
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Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar
… the earth's surface from a platform operating at long ranges, despite adverse weather conditions or darkness. A local consortium was established to demonstrate a consolidated South African SAR ability to demonstrate to the local and international communities, by generating high quality images with …
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Power-Efficient Voltage-Mode RF Front-End Using Quantized Analog Signal Processing
… filters requires the receiver to handle large blockers (e.g., above 0 dBm) without degrading the noise floor and in turn increases 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 …
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Advanced Downconversion Mixers for CMOS Radio Frequency Integrated Circuits
This thesis explores the design of advanced downconversion mixers in CMOS RF integrated circuits. First, a novel switched transconductor mixer with low power, low noise, and ultra-wide bandwidth is proposed. The transconductor stage with fixed DC operating point is switched by the ac-coupled local …
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Design and Analysis of a Low-Power Low-Voltage Quadrature LO Generation Circuit for Wireless Applications
… market of wireless communication devices demands low power and low cost RF solutions. A quadrature local oscillator (LO) is an essential building block for most transceivers. As the CMOS technology scales deeper into the nanometer regime, design of a low-power low-voltage quadrature LO still poses …
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Study Of Oxide Breakdown, Hot Carrier And Nbti Effects On Mos Device And Circuit Reliability
… oxide trapping and interface generation cause long term performance drift and related reliability problems in devices and circuits. The RF front-end circuits include low noise amplifier (LNA), local oscillator (LO) and mixer. It is desirable for a LNA to achieve high gain with low noise figure, …
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SOA enhanced optical line terminal for future optical access network
… to 400 Gb/s per wavelength using coherent technology. Achieving these targets requires overcoming the large dynamic range of burst-mode upstream packets, typically around 20.5 dB, caused by differential loss between optical network units (ONUs). Conventional burst-mode receivers rely on …
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Design of Low Power Integrated Radios
In this thesis, circuit techniques pertinent to low power CMOS integrated radio design compatible with IEEE 802.15.6 standard are presented. Low power radios are in increasing demand with the advent of an era of the Wireless Body Area Networks and Internet of Things. The performance of the proposed …
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Design and Characterization of RFIC Voltage Controlled Oscillators in Silicon Germanium HBT and Submicron MOS Technologies
Advances in wireless technology have recently led to the potential for higher data rates and greater functionality. Wireless home and business networks and 3G and 4G cellular phone systems are promising technologies striving for market acceptance, requiring low-cost, low-power, and compact …
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Practical Continuous Variable Quantum Key Distribution System with ‘Local’ Local Oscillator
… such as device imperfections, may bring security loopholes and leave QKD systems vulnerable to malicious eavesdropping attacks. Since QKD systems will be used as the practical applications in the real-world, it is of great importance to study the practical security and practical implementations of …
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A High Temperature RF Front-End of a Transceiver for High Speed Downhole Communications
… within the field in many areas, such as well logging downhole telemetry systems, power networks, sensors, and actuators. In the past, the industry has managed to use the existing electronics at temperatures up to 150 oC. However, declining reserves of easily accessible natural resources have …
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Integrated Wideband Self-Interference Cancellation Techniques for FDD and Full-Duplex Wireless Communication
… spectrum opportunities, reduces form factor and lowers the cost of hardware solutions. The current RF spectrum, which is often referred to as the frequency band from 1-6GHz, has become increasingly crowded with only a limited amount of unused and unlicensed spectrum. This dissertation explores …