Cryogenic low noise 2.2–3 GHz amplifier

A simple design of one stage, low power cryogenic amplifier at 2.2–3 GHz range is presented. The design was numerically simulated by freely available microwave library SuperMix. The amplifier constructed according to the numerically optimized design was measured in cryogen-free refrigerator. The measured noise temperature TN ≈ 6 K and gain G ≈ 15.5 dB are in good agreement with numerical simulations.

► We present a simple design of one stage, low power cryogenic amplifier at 2.2–3 GHz. The design was numerically simulated by freely available microwave library SuperMix.
► The properties of the constructed amplifier were measured in a cryogen-free refrigerator at temperature 2.8 K.
► Low noise temperature TN ≈ 6 K at low power consumption P ≈ 4 mW of the amplifier was obtained.
► Such amplifiers are suitable for installation in cryogen-free refrigerators.