Low Phase-Noise Sapphire Crystal Microwave Oscillators : Current Status

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    Abstract

    This work demonstrates that ultra-low phase-noiseoscillators with a single-sideband phase-noise spectral densityapproaching –160 dBc/Hz at Fourier frequency of 1 kHz canbe constructed at microwave frequencies (8 to 10 GHz). Suchnoise performance has been achieved by frequency locking aconventional loop oscillator to a temperature-stabilized sapphiredielectric resonator operating at a relatively high levelof dissipated microwave power (~0.5 W). Principles of microwavecircuit interferometry have been employed to generatethe error signal for the oscillator frequency control system. Nocryogens were used.Two almost identical oscillators were built to perform theclassical 2-oscillator phase noise measurements. The phase referencingof one oscillator to another was achieved by varyingmicrowave power dissipated in the sapphire resonator.
    Original languageEnglish
    Pages (from-to)263-269
    JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    Volume56
    Issue number2
    DOIs
    Publication statusPublished - 2009

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