Characterizing cryogenic amplifiers with a matched temperature-variable noise source
Slawomir Simbierowicz,
Visa Vesterinen,
Joshua Milem
et al.
Abstract:We present a cryogenic microwave noise source with characteristic impedance of 50 Ω that can be installed in a coaxial line of a cryostat. The bath temperature of the noise source is continuously variable between 0.1 K and 5 K without causing significant back-action heating on the sample space. As a proof-of-concept experiment, we perform Y-factor measurements of an amplifier cascade that includes a traveling wave parametric amplifier and a commercial high electron mobility transistor amplifier. We observe sys… Show more
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