SEMICONDUCTOR INTEGRATED CIRCUITS

A very low noise preamplifier for extremely low frequency magnetic antenna

Shimin Feng, Suihua Zhou and Zhiyi Chen

+ Author Affiliations

 Corresponding author: Feng Shimin, fengshimin_86@126.com

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Abstract: Besides the electrode-pair antenna, the magnetic antenna is also used for the extremely low frequency (ELF) submarine communication. To receive the weak ELF signals, the structure of a small sized magnetic antenna determines its specific electrical characteristics. The ELF magnetic antenna shows high internal resistance, alternating-current impedance, and a resonance frequency near the operating bandwidth. In accordance with the electrical characteristics of ELF magnetic antenna, a low noise preamplifier and frequency compensation circuit were designed and realized. The preamplifier is a three-stage negative feedback circuit, which is composed of parallel JFET, common-emitter amplifier with a Darlington structure and a common-collector amplifier in push-pull connection. And a frequency compensation circuit is cascaded to compensate the characteristic in low frequency range. In the operating bandwidth f=30-200 Hz, the circuit has a gain of 39.4 dB. The equivalent input noise is 1.97 nV/$\sqrt {{\text{Hz}}} $ and the frequency response keeps flat in operating bandwidth. The proposed preamplifier of the ELF magnetic antenna performs well in receiving ELF signals.

Key words: ELF magnetic antennapreamplifierlow noisefrequency compensation



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Fig. 1.  Equivalent circuit diagram of the ELF magnetic antenna.

Fig. 2.  Frequency response of the ELF magnetic antenna

Fig. 3.  Circuit diagram of the preamplifier.

Fig. 4.  Frequency response of the preamplifier.

Fig. 5.  Frequency spectrum of the noise and signal amplified by the preamplifier.

Fig. 6.  Schematic of the frequency compensation circuit

Fig. 7.  Frequency response of the frequency compensation circuit.

Fig. 8.  Frequency response of the ELF magnetic antenna with different frequency compensation forms.

Table 1.   Electrical parameters of the magnetic antenna.

[1]
[2]
Tumanski S. Induction coil sensors—a review. Measurement Science and Technology, 2007, 18:R31 doi: 10.1088/0957-0233/18/3/R01
[3]
Ju H J, Zhu W H, Fang G Y. A review on ferromagnetic induction coil sensors. Progress in Geophys, 2010, 25(5):1870(in Chinese) http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQWJ201005051.htm
[4]
Prance R, Clark T, Prance H. Ultra low noise induction magnetometer for variable temperature operation. Sensors and Actuators A:Physical, 2000, 85(1-3):361 doi: 10.1016/S0924-4247(00)00375-7
[5]
Seran H C, Fergeau P. An optimized low frequency three axis search coil for space research. Review of Scientific Instruments, 2005, 76:1 doi: 10.1063/1.1884026?amp;quot=&journalCode=rsi
[6]
[7]
Coillot C, Moutoussamy J, Lebourgeois R, et al. Principle and performance of a dual-band search coil magnetometer:a new instrument to investigate fluctuating magnetic fields in space. IEEE Sensors J, 2010, 10(2):255 doi: 10.1109/JSEN.2009.2030977
[8]
Coillot C, Leroy P. Induction magnetometers principle, modeling and ways of improvement. Magnetic Sensors, 2012:45 https://cdn.intechopen.com/pdfs-wm/30943.pdf
[9]
Gao J Z. Weak signal detection. Beijing:Tsinghua University Press, 2004:49 http://okina.univ-angers.fr/publications/ua6510
[10]
Rhouni A, Sou G, Leroy P, et al. A very low 1/f noise ASIC preamplifier for high sensitivity search-coil magnetometers. Proceedings of EMSA'10 Conference, Turkey:2010 http://hal.upmc.fr/hal-00602453
[11]
Liu Y G, Luo P, Zhang B, et al. A three-stage amplifier with single miller-capacitor frequency compensation. Chinese Journal of Semiconductors, 2007, 28(10):1636 http://www.textroad.com/pdf/JBASR/J.%20Basic.%20Appl.%20Sci.%20Res.,%203(2s)6-11,%202013.pdf
[12]
Ma H F, Zhou F, Niu Q, et al. Nested miller active-capacitor frequency compensation for low-power three-stage amplifiers. Journal of Semiconductors, 2008, 29(9):1698 http://www.jos.ac.cn/bdtxbcn/ch/reader/view_abstract.aspx?file_no=08033101&flag=1
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    Received: 31 October 2012 Revised: 18 February 2013 Online: Published: 01 July 2013

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      Shimin Feng, Suihua Zhou, Zhiyi Chen. A very low noise preamplifier for extremely low frequency magnetic antenna[J]. Journal of Semiconductors, 2013, 34(7): 075003. doi: 10.1088/1674-4926/34/7/075003 S M Feng, S H Zhou, Z Y Chen. A very low noise preamplifier for extremely low frequency magnetic antenna[J]. J. Semicond., 2013, 34(7): 075003. doi: 10.1088/1674-4926/34/7/075003.Export: BibTex EndNote
      Citation:
      Shimin Feng, Suihua Zhou, Zhiyi Chen. A very low noise preamplifier for extremely low frequency magnetic antenna[J]. Journal of Semiconductors, 2013, 34(7): 075003. doi: 10.1088/1674-4926/34/7/075003

      S M Feng, S H Zhou, Z Y Chen. A very low noise preamplifier for extremely low frequency magnetic antenna[J]. J. Semicond., 2013, 34(7): 075003. doi: 10.1088/1674-4926/34/7/075003.
      Export: BibTex EndNote

      A very low noise preamplifier for extremely low frequency magnetic antenna

      doi: 10.1088/1674-4926/34/7/075003
      Funds:

      the Defense Pre-Research Foundation of China 51401020503

      Project supported by the Defense Pre-Research Foundation of China (No. 51401020503)

      More Information
      • Corresponding author: Feng Shimin, fengshimin_86@126.com
      • Received Date: 2012-10-31
      • Revised Date: 2013-02-18
      • Published Date: 2013-07-01

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