A.S. Matsaev

LLC «IKS» (Moscow, Russia)

deoiks@mail.ru

The article refers to the field of research of noise fluctuations or flicker noise in electronic amplifiers and is devoted to the exact definition of the magnitude and shape of the spectral density of flicker-noise. The 1/f approximation of flicker noise is analyzed and the problem of its non-constructiveness in analyzing the noise characteristics of electronic amplifiers is shown. To eliminate this problem, the mechanism of physical formation of the envelope, a form of spectral density flicker-noise is defined. The physics of flicker-noise is detailed by accurate definition of the place of its formation. An accurate definition of the maximum difference of the amplifier flickernoise on the flat section of noise characteristics is given, using an explanation of the physics of flicker noise. The mechanism and conditions of the exponential increase of flicker noise and its subsequent exponential desire for maximum magnitude are explained. A simple physical approximation is given to determine the processes of forming the envelope form of the spectral density of flickernoise. The physical understanding of the formation of spectral density of flicker-noise tension in the internal structure of the transistor with the participation of external circuits of the amplifier electrical circuit is detailed.

The results of the study will help developers to solve many problems of building electronic devices and optimizing their characteristics at a qualitatively new level.

Matsaev A.S. Approximation and the point of flicker-noise formation. Achievements of modern radioelectronics. 2021. V. 75. № 6. 

P. 58–68. DOI: https://doi.org/10.18127/j20700784-202106-06

1. Matsaev A.S. Fizika flikker-shuma i modifikatsiya modeli tranzistora. Zhurnal radioelektroniki [el. zhurnal]. 2020. № 7. https://doi.org/10.30898/1684-1719.2020.7.15. [in Russian]
2. Matsaev A.S. Flikker-shum. Osobennosti, raznoobrazie i upravlenie. Zhurnal radioelektroniki [el. zhurnal]. 2020. № 10. https://doi.org/10.30898/1684-1719.2020.10.7. [in Russian]
3. Simulyator LTspiceXVII. URL: https://www.analog.com/ru/design-center/design-tools-and-calculators/ltspicesimulator.html.  [in Russian]
4. Johnson J.B. The Schottky affect in low frequency circuits. Phys. Rev. 1925. 26. P. 71–85.
5. Bukingem M. Shumy v elektronnykh priborakh i sistemakh. Per. s angl. M.: Mir. 1986. [in Russian]
6. Biblioteka LTspiceXVII. URL: https://www.analog.com/ru/design-center/design-tools-and-calculators/ /ltspicesimulator.html.  [in Russian]
7. Flinn I. Extent of the 1/f noise spectrum. Nature. 1968. 219. P. 1356–1357.
8. Biblioteka LTspiceXVII. URL: https://www.analog.com/ru/design-center/design-tools-and-calculators/ /ltspicesimulator.html.  [in Russian]
9. Khorovits P., Khill N. Iskusstvo skhemotekhniki. Izd. 7-e. Per. s angl. M.: Mir. BINOM. 2011. [in Russian]
10. Zi S. Fizika poluprovodnikovykh priborov: V 2-kh knigakh. Kn. 1. Per. s angl. 2-e pererab. i dop. izd. M.: Mir. 1984. [in Russian]