Papers that I believe are useful for the cryogenic amplifier stage can be found here:
Review of Scientific Instruments, 76, 124702 , 2005, A cryogenic voltage amplifier with 36 MHz bandwidth using discrete GaAs
metal-semiconductor field-effect transistors, B. H. Hu and C. H. Yang
http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=RSINAK000076000012124702000001&idtype=cvips&prog=normal
LT21 - Proceedings of the 21st International Conference on Low Temperature Physics, Prague,. August 8-14, 1996
Czechoslovak Journal of Physics, Vol.46(1996), SUppl. S5, pp. 2843-2844
Optimization of high-Q low frequency NMR measurement
Y. Kondoa, J. H. Koivuniemib, J. J. Ruohiob, V. M. Ruutub, and M. Krusiusb
http://lib.tkk.fi/Diss/2001/isbn9512253925/article1.pdf
Development of Ultra-Low Noise HEMTs for Cryoelectronics at ≤ 4.2 K
http://www.springerlink.com/content/bv268573v07up431/fulltext.pdf
Interestingly this paper reports a HEMT providing 0.12nV/sqrt(Hz) at 100kHz.
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WinterlandUser - 15 Dec 2009
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Topic revision: r2 - 2010-03-09 - WinterlandUser