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 13 of 13 for “"wide tuning range"”.
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Analysis and Design of Wide Tuning Range Low Phase Noise mm-wave LC-VCOs
… to have low phase noise while maintaining wide tuning range to achieve low bit error rates (BERs). Due to the large parasitic capacitance and high losses in silicon based technologies, extending the tuning range and reducing phase noise is becoming very challenging. This dissertation …
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Microelectromechanical Systems (Mems) for Radio Frequency Applications
… using micromachining technology. First, a new wide-tuning-range tunable capacitor design is proposed and prototype devices are fabricated using surface micromachining technology. This new tunable capacitor has the advantages of simple configuration, IC-compatible fabrication process, low loss, …
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Broadband mm-wave signal generation and amplification in CMOS using synthetic impedance
… current of a MOS transistor. A high frequency, wide tuning range 105-121GHz oscillator and a small-footprint 20-40GHz oscillator using synthetic resonance are presented. The concept of impedance synthesis is also used to generate a novel frequency-adaptive loss compensation scheme for …
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Passive and active Bragg gratings for optical networks
… technique. The advantage of an S-bending tuning FBG is that its central wavelength is invariant as the linear strain gradient along the FBG is altered. Two new devices are developed by embedding a pair of FBGs in a single uniform beam for S-bending. One is the tunable dispersion …
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Design and analysis of high performance low noise oscillators and phase lock loops
… is proposed which has the advantage of an ultra wide tuning range. A novel noise aware ring oscillator model is also proposed which links the noise performance of the oscillator to its transistor dimensions giving insight to the design procedure. The use of this VCO model in a noise-aware PLL …
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A 1.6-3.2GHz, high phase accuracy quadrature phase locked loop
… A single PLL capable of operating over a wide frequency range while meeting all the requirements of the individual standards can save area and design effort, compared with multiple PLLs each supporting only one standard. This thesis presents a PLL that has a very wide tuning range, …
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Spectrum monitor for cognitive radio
… to determine the activity level across a large range of spectrum in order to assign a channel for its use. Hence a key function is a spectrum monitor to detect the spectrum availability as a first step. This thesis explores the requirements and design issues for the spectrum monitor receiver. …
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A high speed serializer/deserializer design
… design, which included the low jitter design, wide bandwidth design and low power design.</p><p>A quarter-rate multiplexer/demultiplexer (MUX/DEMUX) was implemented. This quarter-rate structure decreases the required clock frequency from one half to one quarter of the data rate. It is shown …
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Femtosecond optical parametric oscillators for the mid-infrared
… of grating, pump wavelength and cavity length tuning. A theoretical model indicated that a very broad gain bandwidth allowed the wide tuning range. An attractively low oscillation threshold of 45 mW was recorded, and a visible output of 70 mW at 540 nm was observed, caused by simultaneously …
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Miniaturised bandpass filters for wireless communications
… the resonator inherently possesses a relatively wide stopband as the lowest spurious harmonic resonance is observed at thrice the fundamental frequency. Properties of this resonator, such as these and more are explored in depth to arrive at an accurate electrical equivalent circuit, which is used …
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Wirelessly Powered Sensor Design with On-Chip Antenna in CMOS Technology
… injection-locked oscillator to achieve wide tuning range from 4 to 5 GHz. The third chip is a millimeter sized wirelessly-powered pH sensor together with customized IrOx sensing electrode. The pH sensor transmits a pH-sensitive frequency signal that is converted from the sensed electrode …
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Study Of Oxide Breakdown, Hot Carrier And Nbti Effects On Mos Device And Circuit Reliability
… low noise signal with sufficient output power, wide tuning range, and high stability, and a mixer to up-convert or down-convert the signal with good linearity. However, the RF front-end circuit performance is very sensitive to the variation of device parameters. The experimental results show …
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Miniaturised and reconfigurable planar filters for ultra-wideband applications
… unlicensed frequency band 3.1-10.6 GHz for ultra-wideband (UWB) commercial communications, the development race for commercialising UWB technology has seen a dramatic increase around the world. The aim of this research is to develop reconfigurable planar microwave filters for ultrawideband …