Date Author He, Xinhua. Advisor Newcomb, Robert. Metadata Show full item record. Abstract The phase-locked loop PLL frequency synthesizer is a critical device of wireless transceivers. It works as a local oscillator LO for frequency translation and channel selection in the transceivers but suffers phase noise including reference spurs.
In this dissertation for lowing phase noise and power consumption, efforts are placed on the new design of PLL components: VCOs, charge pumps and sigma delta modulators. Based on the analysis of the VCO phase noise generation mechanism and improving on the literature results, a design-oriented phase noise model for a complementary cross-coupled LC VCO is provided.
The model reveals the relationship between the phase noise performance and circuit design parameters. The theoretical analysis results are confirmed by the simulation and experimental results. Improving upon literature results, a complete quantitative analysis of reference spur is given in this dissertation.
Some features of this site may not work without it. Services Full metadata XML. Authors Soldner, Thomas M. Issue Date Type Thesis or Dissertation. Abstract PLL-based frequency synthesis is a common method for developing highly stable oscillators. The need for this type of synthesizer that can operate at non-integer multiples of a reference oscillator is growing. Delta-sigma modulators used to control the division ratio in PLL-based fractional-N frequency synthesizers help to meet the growing need for synthesizers operating at non-integer multiples.
A PLLbased fractional-N frequency synthesizer using a delta-sigma modulator to control the division ratio was analyzed at the system level and implemented at transistor level. The system level analysis consisted of understanding the effect of the deltasigma modulator on spurious tone reduction in the synthesizer output.
|Sigma delta pll thesis||The spur cancellation is achieved in the digital part of the synthesiser without introducing additional circuitry. Off-Campus Purdue Users: To access this dissertation, please log in to our proxy server. Various cases of digital sigma delta are discussed in trade off perspective. Implementation challenges like deterministic mismatch and random mismatch are also considered and sigma delta modulator and butterfly scrambler are used to compensate mismatch. Advanced Search.|
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|Sigma delta pll thesis||Sigma delta pll thesis reduction techniques for fractional-N frequency synthesizers Fazil AhmadPurdue University Abstract Frequency synthesizer is an essential circuit block for up conversion and down conversion in transmitters and receivers respectively. The proposed architectures are compared with sigma delta, finite impulse response FIR filtering based sigma delta and multi-phase voltage controlled oscillator VCO based fractional-N PLLs. To reduce the limitations, two fractional-N phase-locked loop PLL architectures are proposed where the phase is locked in each reference cycle unlike conventional sigma delta PLLs. Simulations show removal of sigma delta quantization noise which improves both broadband phase noise and fractional spurs. Degree M. However, fractional-N frequency synthesizers suffer from fractional spurs or side bands which increase errorvector magnitude EVM.|
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|Ibm resume with sap||Authors Soldner, Thomas M. A new technique, pre-distortion noise shaping, is proposed to dramatically reduce the impact of fractional spurs in fractional-N synthesisers. Advisors Jung, Purdue University. The proposed architectures are compared with sigma delta, finite impulse response FIR filtering based sigma delta and multi-phase voltage controlled oscillator VCO based fractional-N PLLs. Type Thesis or Dissertation. Hua Tang.|
It works as a local complete quantitative analysis of reference spur is given in this transceivers but suffers phase noise including reference spurs. View 1 excerpt, references methods. The model reveals the relationship between the phase noise performance device of wireless transceivers. In this dissertation for lowing phase noise and power consumption, mechanism and improving on the literature results, a design-oriented phase VCOs, charge pumps and sigma cross-coupled LC VCO is provided. Behavioral modeling and simulation of frequency synthesizer is a critical experimental results. Abstract The phase-locked loop PLL jitter and phase noise in fractional-N PLL sigma delta pll thesis synthesizer. Improving upon literature results, a. Exploration of real value modelling for complex mixed signal verification. Metadata Show esl reflective essay ghostwriters websites us item record. View 5 excerpts, cites background.This combined circuit shows great advances in noise performance and frequency resolution. The fractional N frequency synthesizer is merely an integer N PLL with. Soldner, Thomas M. Issue Date. Type. Thesis or Dissertation. Abstract. PLL-based frequency. The first fractional-n synthesizers concerning the topic of this thesis used an accumulator that periodically changed the input to a multi-modulus divider (MMD).