Fully differential cryogenic transistor amplifier
نویسندگان
چکیده
We have constructed a dc-coupled differential amplifier capable of operating in the 4.2 K – 300 K temperature range. The amplifier can be operated at high-bias setting, where it dissipates 5 mW, has noise temperature TN < 0.8 K at 4 k source resistance and >40 MHz bandwidth at 4.2 K bath temperature. The bias setting can be adjusted: at our lowest tested setting the amplifier dissipates <100 W, has noise temperature TN 2 K at 25 k source resistance and 2 MHz bandwidth. The 1/f noise corner frequency is a few times 10 kHz. We foresee the amplifier to have an application in the readout of Superconducting Quantum Interference Devices (SQUIDs), Superconducting Tunnel Junction Detectors (STJs) and Transition Edge Sensors (TESes). We have verified the practical use of the amplifier by reading out a 4.2 K 480-SQUID array with 40 MHz bandwidth and < 8×10 0 / Hz flux noise. Highlights we have built a fully differential cryogenic dc-coupled amplifier the amplifier has high bandwidth, low noise temperature and high CMRR our amplifier is suitable for readout of SQUIDs and superconducting detectors
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