Cryogenic amplifiers for interfacing superconductive systems to room temperature electronics

Badenhorst, Le Roux (2008-12)

Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2008.


This thesis is aimed at testing commercially available CMOS amplifier ICs at 4 K. Super Conducting Electronics (SCE) will also be used to amplify RSFQ signals for easier detection by CMOS technology and better signal-to-noise ratios. The SCE comprises of a Suzuki stack amplifier, a 250 μA JTL and a DC-to-SFQ converter. The Suzuki stack amplifier is simulated in WRSPICE. It is able to amplify an SFQ signal synchronised with an external clock signal. The amplified signal can then be detected by a normal commercially available CMOS amplifier IC. To keep the noise in the signal to a minimum, the commercial amplifier must be be situated as close as possible to the SCE. The amplifier must therefore be able to operate at 4 K. Ten different amplifier ICs were tested and three was found that worked down to 4 K.

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