Low‐frequency noise in low‐Tc multiloop magnetometers with additional positive feedback

1995 ◽  
Vol 67 (10) ◽  
pp. 1474-1476 ◽  
Author(s):  
Dietmar Drung
Keyword(s):  
Positive Feedback ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Additional Positive Feedback

FULLY INTEGRATED DC SQUID MAGNETOMETERS FOR ULTRA LOW FREQUENCY NOISE APPLICATIONS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 690-695 ◽  
Author(s):  
C. DI RUSSO ◽  
C. GRANATA ◽  
L. LONGOBARDI ◽  
A. MONACO ◽  
M. RUSSO ◽  
...  
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Fully Integrated ◽  
Coil Structure ◽  
Additional Noise ◽  
Field Noise ◽  
Low Magnetic Field ◽  
Additional Positive Feedback ◽  
Squid Magnetometers

Fully integrated dc SQUID magnetometers for ultra low frequency noise applications have been designed, fabricated and characterized. The basic design of the sensor is based on the Ketchen-type magnetometer. A moat surrounding the washer have been inserted to reduce 1/f noise due to hopping of flux vortices, trapped in the SQUID body during the cool-down process. To decrease flux motions in the pick-up coil structure a turn width as small as possible has been used. Further Josephson junctions with high areas have been employed to reduce the 1/f arising from critical currant fluctuations. An additional positive feedback (APF) circuit and a feedback coil for Flux-Locked-Loop (FLL) have been integrated on the same chip to avoid any additional noise due to an external APF circuit. Details about design criteria and experimental results concerning voltage-flux characteristics and noise performances of the devices are presented. Due to a low magnetic field noise, such devices well meet the requirements of ultra-low frequency noise applications.

Estimating the Quality of Thermionic Cathodes for Microwave Vacuum Tubes Using the Low-Frequency Noise Parameters

Vestnik MEI ◽  
2018 ◽  
Vol 5 (5) ◽  
pp. 120-127
Author(s):  
Mikhail D. Vorobyev ◽  
◽  
Dmitriy N. Yudaev ◽  
Andrey Yu. Zorin ◽  
◽  
...  
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Parameters ◽  
Thermionic Cathodes ◽  
Vacuum Tubes

Simulation of Low Frequency Noise in a CCTWT

1999 ◽  
Author(s):  
Charles K. Birdsall ◽  
J. P. Varboncoeur ◽  
P. J. Christensen
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

Impacts of low-frequency noise from industrial sources in residential areas

2021 ◽  
Vol 182 ◽  
pp. 108203
Author(s):  
Lígia T. Silva ◽  
Alda Magalhães ◽  
José Ferreira Silva ◽  
Fernando Fonseca
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Residential Areas ◽  
Industrial Sources

scholarly journals LOW-FREQUENCY NOISE MEASUREMENTS OF IR PHOTODETECTORS WITH VOLTAGE CROSS CORRELATION SYSTEM

Measurement ◽  
2021 ◽  
pp. 109867
Author(s):  
Krzysztof ACHTENBERG ◽  
Janusz MIKOŁAJCZYK ◽  
Carmine CIOFI ◽  
Graziella SCANDURRA ◽  
Krystian MICHALCZEWSKI ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Ir Photodetectors ◽  
Noise Measurements ◽  
Correlation System

Low-Frequency Noise Investigation of AlGaN/GaN High-Electron-Mobility Transistors

2021 ◽  
pp. 108050
Author(s):  
Maria Glória Caño de Andrade ◽  
Luis Felipe de Oliveira Bergamim ◽  
Braz Baptista Júnior ◽  
Carlos Roberto Nogueira ◽  
Fábio Alex da Silva ◽  
...  
Keyword(s):  
Electron Mobility ◽  
Low Frequency ◽  
High Electron Mobility Transistors ◽  
Frequency Noise ◽  
High Electron ◽  
Low Frequency Noise ◽  
High Electron Mobility ◽  
Electron Mobility Transistors
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