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 17 of 17 for “"Frequency synthesizers"”.
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Digital enhancement techniques for fractional-N frequency synthesizers
… thesis is on improving the energy efficiency of frequency synthesizers and clocking modules by exploring design techniques at both the architectural and circuit levels. In the first part of this work, a digital fractional-N phase locked loop (FNPLL) that employs a high resolution time-to-digital …
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Automatic calibration of modulated fractional-N frequency synthesizers
… has been the development of a low power, radio frequency transmitter architecture. Specifically, a technique for in service automatic calibration of a modulated phase locked loop (PLL) frequency synthesizer has been developed. Phase/frequency modulation is accomplished by modulating the feedback …
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Design Techniques for Frequency Synthesizers in Highly Scaled CMOS Technologies
… the nanometer devices. Phase-locked-loop-based frequency synthesizers are essential building blocks in almost all the communication systems. The design of PLLs is a true mixed signal design challenge covering from high speed analog and RF blocks (VCO), to high speed digital blocks (dividers), to …
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Multi-Bit Delta -Sigma Modulation Technique for Fractional-N Frequency Synthesizers
… consideration of practical design aspects for frequency synthesizers. A prototype fractional- N frequency synthesizer using a 3-b third-order Delta-Sigma modulator has been designed and implemented in 0.5-gm CMOS. Synthesizing 900 MHz with 1-Hz resolution, it exhibits an in-band phase noise of …
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Techniques for high data rate modulation and low power operation of fractional-N frequency synthesizers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Low phase noise, high bandwidth frequency synthesis techniques
… technique is proposed that allows fractional-N frequency synthesizers to achieve high closed loop bandwidth and low output phase noise simultaneously. Quantization induced phase noise is the bottleneck in state-of-the-art synthesizer design, and results in a noise-bandwidth tradeoff that …
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Automatic generation of an LC voltage controlled oscillator
… (VCO) is used to generate a signal with a frequency that is a function of an input voltage amplitude, and is an integral part of circuits such as phase locked loops, frequency synthesizers, down conversion receivers, and clock generators. A typical design flow for a VCO involves …
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Analysis, simulation and design of nonlinear RF circuits
… Computer Aided Design (CAD) algorithms for high-frequency circuits. Novel Padébased algorithms for numerical integration of ODEs as arise in high-frequency circuits are proposed. Both single- and multi-step methods are introduced. A large part of this section of the research is concerned with the …
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High-performance reference frequency generation techniques
Low-noise high-frequency fast-startup reference frequency generators are needed in high-performance power-efficient communication systems. Frequency synthesizers that generate high-frequency clocks in modern wireline/wireless transceivers require high-frequency reference clocks to achieve excellent …
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Digital Harmonic-Cancelling Sinusoidal Signal Synthesis
Sinusoidal signal synthesizers are essential modules in a variety of electronic applications, such as communication systems, calibration and verification of analog/mixed-signal integrated circuits (ICs), and lab-on-chip medical/material analyzers. For several decades, researchers have worked on …
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Fibre-based devices for next generation photonics communication systems
… the optical generation and distribution of radio frequency signals over fibres, and the fibre optic signal processing of optical and radio frequency signals, have been the subjects for study in this thesis. Based on the intrinsic properties of single-mode optical fibres, and in conjunction with …
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Design and Implementation of Low Jitter Clock Generators in Communication and Aerospace System
… performances with respect to high operating frequency, low noise, small area, and low power consumption. Clock generators are essential components in numerous circuits, for instance, frequency synthesizers for high speed transceivers, clock sources for microprocessors, noise suppressed …
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Elastic wave tailoring at the macro/micro/nano- scales using intentional strongly nonlinear coupling
… accessible in the linear dynamic regime such as frequency-amplitude dependence, sudden transitions (jumps), bifurcations, saturation effects, internal resonances, and chaos. In this work we harness this nonlinear behavior in the form of nonlinear coupling in acoustic waveguides. Common methods of …