Fig. 1.
Equivalent circuit diagram of the ELF magnetic antenna.
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| 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.
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A very low noise preamplifier for extremely low frequency magnetic antenna
doi: 10.1088/1674-4926/34/7/075003
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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.-
Keywords:
- ELF magnetic antenna,
- preamplifier,
- low noise,
- frequency compensation
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References
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