Search results for "Noise temperature"

showing 3 items of 23 documents

Cross-Spectrum PM Noise Measurement, Thermal Energy, and Metamaterial Filters.

2017

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 com…

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 acousticsInstrumentationIEEE transactions on ultrasonics, ferroelectrics, and frequency control
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Noise characterization of analog to digital converters for amplitude and phase noise measurements

2017

International audience; Improvements on electronic technology in recent years have allowed the application of digital techniques in phase noise metrology where low noise and high accuracy are required, yielding flexibility in systems implementation and setup. This results in measurement systems with extended capabilities, additional functionalities and ease of use. In most digital schemes the Analog to Digital Converters (ADCs) set the ultimate performance of the system, therefore the proper selection of this component is a critical issue. Currently, the information available in literature describes in depth the ADC features only at frequency offsets far from the carrier. However, the perfo…

[SPI.OTHER]Engineering Sciences [physics]/OtherNoise temperatureThermal noiseNoise measurementComputer science1/f noise020208 electrical & electronic engineeringQuantum noise02 engineering and technologyNoise figure01 natural sciencesNoise floorNoise shapingComputer Science::Hardware ArchitectureElectric measurements0103 physical sciencesPhase noise0202 electrical engineering electronic engineering information engineeringElectronic engineeringEffective input noise temperatureOscillatorsThermal noise1/f noise Clocks Oscillators Electric measurements010301 acousticsInstrumentationClocksReview of Scientific Instruments
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Thermal noise limit for ultra-high vacuum noncontact atomic force microscopy

2013

The noise of the frequency-shift signal Δf in noncontact atomic force microscopy (NC-AFM) consists of cantilever thermal noise, tip–surface-interaction noise and instrumental noise from the detection and signal processing systems. We investigate how the displacement-noise spectral density dz at the input of the frequency demodulator propagates to the frequency-shift-noise spectral density dΔf at the demodulator output in dependence of cantilever properties and settings of the signal processing electronics in the limit of a negligible tip–surface interaction and a measurement under ultrahigh-vacuum conditions. For a quantification of the noise figures, we calibrate the cantilever displacemen…

noiseCantilevernoncontact atomic force microscopyGeneral Physics and AstronomyNanotechnologyCantileverlcsh:Chemical technologyNoise (electronics)lcsh:Technology530Full Research PaperOpticsPhase noiseNanotechnologyGeneral Materials ScienceDetection theorylcsh:TP1-1185Electrical and Electronic Engineeringlcsh:SciencePhysicsNoise temperaturefilterbusiness.industrylcsh:TNoise spectral densityBandwidth (signal processing)Spectral density(NC-AFM)noncontact atomic force microscopy (NC-AFM)lcsh:QC1-999Nanosciencelcsh:Qfeedback loopbusinesslcsh:Physics
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