Ultra-Stable Very-Low Phase-Noise Signal Source for Very Long Baseline Interferometry Using a Cryocooled Sapphire Oscillator

Nitin R. Nand*, John G. Hartnett, Eugene N. Ivanov, Giorgio Santarelli

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    The design and implementation of a novel frequency synthesizer based on low phase-noise digital dividers and a direct digital synthesizer is presented. The synthesis produces two low-noise accurate tunable signals at 10 and 100 MHz. We report the measured residual phase noise and frequency stability of the synthesizer and estimate the total frequency stability, which can be expected from the synthesizer seeded with a signal near 11.2 GHz from an ultra-stable cryocooled sapphire oscillator (cryoCSO).

    Original languageEnglish
    Article number6032721
    Pages (from-to)2978-2986
    Number of pages9
    JournalIEEE Transactions on Microwave Theory and Techniques
    Volume59
    Issue number11
    DOIs
    Publication statusPublished - Nov 2011

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