Abstract
The noise and signal parameters of several types of the RF amplifiers based on the different SQUIDs with integrated and hybrid input coils were studied. A new type of the multiloop dc SQUID with integrated input coil and extremely low stray capacitances was designed. The inductance of a 4-loop SQUID was 100pH, the input coil inductance 1.3nH and mutual inductance 300pH. The noise temperature of untuned SQUID amplifier with hybrid input coil at 100MHz was 1.2±1K and the power gain exceeds 20dB. The tuned integrated 4-loop amplifier at 300MHz has nearly 20dB gain in 25MHz band. For the noise calibration of such amplifiers we used SIS junctions as a shot noise source, or cooled attenuator and a room-temperature semiconductor noise source.
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