Cryogenic amplifiers for interfacing superconductive systems to room temperature electronics

[摘要] This thesis is aimed at testing commercially available CMOS amplifier ICs at4 K. Super Conducting Electronics (SCE) will also be used to amplify RSFQsignals for easier detection by CMOS technology and better signal-to-noiseratios.The SCE comprises of a Suzuki stack amplifier, a 250 μA JTL and aDC-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 availableCMOS amplifier IC.To keep the noise in the signal to a minimum, the commercial amplifier mustbe be situated as close as possible to the SCE. The amplifier must thereforebe able to operate at 4 K. Ten different amplifier ICs were tested and threewas found that worked down to 4 K.

[发布机构] Stellenbosch University