Low noise front end electronics for dilution refrigerator experiments

Publication information:

W. Stockwell, D. Yvon, Aubourg, P. D. Barnes, A. Cummings, A. Silva, B. Ellman, R. R. Ross, B. Sadoulet, T. Shutt, G. Smith, C. Stubbs, N. Wang, S. White, and B. A. Young. 1993. “Low Noise Front End Electronics for Dilution Refrigerator Experiments”. Journal of Low Temperature Physics, 93, Pp. 755. doi:10.1007/BF00693508

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Abstract

We have developed low noise voltage and low noise charge sensitive preamplifiers for use in dilution refrigerator experiments. The amplifiers use a JFET at 140K as the front end. Each JEET dissipates about 7 mW on the 4K heat sink. The flat noise of the voltage amplifier is 0.9 nV/Hz^1/2, with the 1/f knee below 100 Hz. The charge amplifier noise is 500 eV with a total input capacitance of approximately 90 pF.