Title :
DC SQUID RF amplifiers
Author :
Tarasov, M.A. ; Belitsky, V.Yu. ; Prokopenko, G.V.
Author_Institution :
Inst. of Radio Eng. & Electron., Russian Acad. of Sci., Moscow, Russia
fDate :
6/1/1992 12:00:00 AM
Abstract :
The noise and signal parameters of several types of RF amplifiers based on different SQUIDs with integrated and hybrid input coils were studied. A new type of multiloop DC SQUID with an integrated input coil and extremely low stray capacitances was designed. The inductance of a four-loop SQUID was 100 pH, the input coil inductance 1.3 nH, and mutual inductance 300 pH. The tuned integrated four-loop amplifier at 420 MHz had a noise temperature lower 0.5 K and a power gain of nearly 20 dB in a 60-MHz bandwidth. For the noise calibration of such amplifiers, SIS junctions were used as a shot noise source, or a cooled attenuator and a room temperature semiconductor noise source were used.<>
Keywords :
DC amplifiers; SQUIDs; electron device noise; radiofrequency amplifiers; 20 dB; 420 MHz; 60 MHz; DC SQUID RF amplifiers; LNA; RF amplifiers; SIS junctions; SQUIDs; bandwidth; cooled attenuator; four-loop SQUID; input coil inductance; integrated input coil; low noise amplifiers; low stray capacitances; multiloop DC SQUID; mutual inductance; noise calibration; noise temperature; power gain; room temperature semiconductor noise source; shot noise source; signal parameters; Bandwidth; Capacitance; Coils; Inductance; Low-noise amplifiers; RF signals; Radiofrequency amplifiers; SQUIDs; Semiconductor device noise; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
