University of Maryland LibrariesDigital Repository at the University of Maryland
    • Login
    View Item 
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    LOW PHASE NOISE CMOS PLL FREQUENCY SYNTHESIZER DESIGN AND ANALYSIS

    Thumbnail
    View/Open
    umi-umd-4746.pdf (2.503Mb)
    No. of downloads: 7690

    Date
    2007-08-03
    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. Using this phase noise model, an optimized 2GHz low phase noise CMOS LC VCO is designed, simulated and fabricated. The theoretical analysis results are confirmed by the simulation and experimental results. With this VCO phase noise model, we also design a low phase noise, low gain wideband VCO with the typical VCO gain around 100MHz/V. Improving upon literature results, a complete quantitative analysis of reference spur is given in this dissertation. This leads to a design of a charge pump by using a negative feedback circuit and replica bias to reduce the current mismatch which causes the reference spur. In addition, low-impedance charge/discharge paths are provided to overcome the charge pump current glitches which also cause PLL spurs. With a large bit-width high order sigma delta modulator, the fractional-N PLL has fine frequency resolution and fast locking time. Based on an analysis of sigma delta modulator models introduced in this dissertation, a 3rd-order MASH 1-1-1 digital sigma delta modulator is designed. Pipelining techniques and true single phase clock (TSPC) techniques are used for saving power and area. Included is the design of a fully integrated 2.4GHz §¢ fractional-N CMOS PLL frequency synthesizer. It takes advantage of a sigma delta modulator to get a very fine frequency resolution and a relatively large loop bandwidth. This frequency synthesizer is a 4th-order charge pump PLL with 26MHz reference frequency. The loop bandwidth is about 150KHz, while the whole PLL phase noise is about -120dBc/Hz at 1MHz frequency offset.
    URI
    http://hdl.handle.net/1903/7337
    Collections
    • Electrical & Computer Engineering Theses and Dissertations
    • UMD Theses and Dissertations

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility
     

     

    Browse

    All of DRUMCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister
    Pages
    About DRUMAbout Download Statistics

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility