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http://dx.doi.org/10.46670/JSST.2022.31.2.120

Low-Noise Preamplifier Design for Underwater Electric Field Sensors using Chopper stabilized Operational Amplifiers and Multiple Matched Transistors  

Bae, Ki-Woong (Agency for Defence Development, Maritime Technology Research Institute)
Yang, Chang-Seob (Agency for Defence Development, Maritime Technology Research Institute)
Han, Seung-Hwan (LIG Nex1)
Jeoung, Sang-Myung (Advanced Wave Technology)
Chung, Hyun-Ju (Agency for Defence Development, Maritime Technology Research Institute)
Publication Information
Journal of Sensor Science and Technology / v.31, no.2, 2022 , pp. 120-124 More about this Journal
Abstract
With advancements in underwater stealth technology for naval vessels, new sensor configurations for detecting targets have been attracting increased attention. Latest underwater mines adopt multiple sensor configurations that include electric field sensors to detect targets and to help acquire accurate ignition time. An underwater electric field sensor consists of a pair of electrodes, signal processing unit, and preamplifier. For detecting underwater electric fields, the preamplifier requires low-noise amplification at ultra-low frequency bands. In this paper, the specific requirements for low-noise preamplifiers are discussed along with the experimental results of various setups of matched transistors and chopper stabilized operational amplifiers. The results showed that noise characteristics at ultra-low frequency bands were affected significantly by the voltage noise density of the chopper amplifier and the number of matched transistors used for differential amplification. The fabricated preamplifier was operated within normal design parameters, which was verified by testing its gain, phase, and linearity.
Keywords
Underwater electric field sensors; Preamplifier; Chopper amplifier; Low-noise amplifier; Low-frequency amplifier;
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