On the performance of low DC power consumption cryogenic amplifiers

The performance of broadband, low-noise, low DC consumption cryogenic amplifiers was studied in detail with emphasis on minimizing the power consumption and optimizing the amplifier performance at cryogenic temperature. A comprehensive approach used in the modelling and amplifier design can help one to minimize the power consumption and optimize the performance of the amplifier. An 8.5 K average noise temperature and 24 dB gain were experimentally obtained in the frequency range 4-8 GHz with total power consumption of 4 mW for a 2-stage design with commercial GaAs transistors.