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ESTIMATING THE SPECTRAL DENSITY OF FLICKER NOISE OF LOW-NOISE OSCILLATORS AT INFRA-LOW FREQUENCIES

Authors :
V. M. Konovalov
K. O. Lukin
Source :
Radio Physics and Radio Astronomy, Vol 27, Iss 3, Pp 229-239 (2022)
Publication Year :
2022
Publisher :
National Academy of Sciences of Ukraine, Institute of Radio Astronomy, 2022.

Abstract

Subject and Purpose. Designers of the research radars intended for detecting manifestations of biological activity of living organisms may be interested in the noise characteristics shown by their oscillators at offsets about 10–2 Hz or even 10–3Hz from the carrier frequency. Unfortunately, the producing companies do not practice regular information on noise performance of their products at frequencies below 1 Hz. The present authors have set the goal of deriving an analytical expression for the spectral density of flicker noise which should allow radar engineers estimating the probable noise performance of low-noise oscillators over any frequency range. Methods and Methodology. A great number of writers considering spectral properties of flicker noise tend to support the assertion that its spectral density increases continuously with a decrease in frequency, following the power law 1/f. Meanwhile, the present authors assume availability of a certain frequencyfmbelow which the spectral density should most likely remain unchanged, even to as low as zero frequency. Also, there is a range of frequencies above which the spectral density of flicker noise remains constant and the total spectral density is determined solely by thermal noise. Results.The spectral density of noise follows the power law 1/f throughout the range fromfm and up to the point where thermal noise starts to overbalance the flicker noise. The authors have proposed an approximating function to describe the behavior of the averaged spectral density of noise from the oscillator within the entire frequency range. Conclusions. The results obtained shall allow radio system designers to make estimates of the probable noise performance of low-noise oscillators in any frequency range, using only known reference data provided by the manufacturer.

Details

Language :
English, Russian, Ukrainian
ISSN :
10279636 and 24157007
Volume :
27
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Radio Physics and Radio Astronomy
Publication Type :
Academic Journal
Accession number :
edsdoj.0b5cd3d9bac84674bac4d79956bc2d44
Document Type :
article
Full Text :
https://doi.org/10.15407/rpra27.03.229