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RESEARCH PRODUCT
Cross-Spectrum PM Noise Measurement, Thermal Energy, and Metamaterial Filters.
Yannick GrusonUlrich L. RohdeVincent GiordanoAjay K. PoddarEnrico Rubiolasubject
Physics[SPI.OTHER]Engineering Sciences [physics]/OtherAcoustics and UltrasonicsOscillator phase noiseNoise measurementbusiness.industryNoise spectral densityNoise figure01 natural sciencesNoise (electronics)Noise floor010309 opticsOptics0103 physical sciencesPhase noiseEffective input noise temperatureElectrical and Electronic Engineeringbusiness010301 acousticsInstrumentationdescription
International audience; Virtually all commercial instruments for the measurement of the oscillator PM noise make use of the crossspectrum method (arXiv:1004.5539 [physics.ins-det], 2010). High sensitivity is achieved by correlation and averaging on two equal channels, which measure the same input, and reject the background of the instrument.We show that a systematic error is always present if the thermal energy of the input power splitter is not accounted for. Such error can result in noise underestimation up to a few decibels in the lowest-noise quartz oscillators, and in an invalid measurement in the case of cryogenic oscillators. As another alarming fact, the presence of metamaterial components in the oscillator results in unpredictable behavior and large errors, even in well controlled experimental conditions. We observed a spread of 40 dB in the phase noise spectra of an oscillator, just replacing the output filter.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 | IEEE transactions on ultrasonics, ferroelectrics, and frequency control |