A wideband radio-frequency amplifier for investigations at temperatures from 300 to 0.1 K

A wideband cooled measuring amplifier, which solves a wide class of search problems in the area of cryoelectronics at frequencies of 10–100 MHz, is described. The amplifier differs from the existing prototypes in the reduced power consumption and influence on the source (suppressed back action effect), serviceability in a temperature interval of 0.1–300 K, and high regulated gain (up to 40 dB). The power consumed (dissipated) by the first ultralow-temperature stage, is ∼1 μW. The circuitry components are commercially available.