In this paper, the design and test results of a front-end cryogenic amplifier for a bolometer detector are presented. The amplifier is implemented with two low-noise Si JFETs, where the first FET is configured as a source follower amplifier and the second FET provides a high dynamic resistance to keep the voltage gain very close to unity. A 3 dB bandwidth over a wide range from DC to 10 MHz is achieved in this design. The input voltage noise density is ~ 1.9 nV/√Hz at 300 K, which further reduces to 1.6 nV/√Hz at 120 K. The flicker corner frequency observed is below 50 Hz.
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The authors thank Mr. S. Mallikarjunachary and Mr. K. V. Divekar for assistance during the measurement. The authors also acknowledge the support of TIN.TIN and INO collaboration.
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Reza, A., Vatsa, V., Pose, M.S. et al. A Cryogenic Front-End Preamplifier Operating at 120 K for Bolometric Detector. J Low Temp Phys (2020). https://doi.org/10.1007/s10909-019-02318-z
- Cryogenic amplifier
- Bolometer detector
- Low-noise amplifier