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Ultra-low-noise, high-impedance preamp for cryogenic detectors

Ultra-low-noise, high-impedance preamp for cryogenic detectors

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A preamplifier design is presented which is based on a common-drain JFET input. The midband noise performance is En = 0.42 nV/Hz½, In = 2.8 fA/Hz½. The circuit has considerably less input capacitance than comparably noisy common-source amplifiers. It is particularly useful for preamplification of 0.1 to 10 MHz signals from liquid-helium-cooled radiation detectors.

References

    1. 1)
      • F.N.H. Robinson . (1974) , Noise and fluctuations in electronic devices and circuits.
    2. 2)
      • C.D. Motchenbacher , F.C. Fitchen . (1973) , Low-noise electronic design.
    3. 3)
      • A. Van Der Ziel . Thermal noise in field effect transistors. Proc. IEEE , 1808 - 1812
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19850296
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