DC SQUID RF amplifier with external mm-wave pumping and its testing by SIS junction noise
M A Tarasov; V Yu Belitsky; G V Prokopenko; L V Filippenko; V P Koshelets; M A Tarasov; Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, USSR; V Yu Belitsky; Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, USSR; G V Prokopenko; Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, USSR; L V Filippenko; Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, USSR; V P Koshelets; Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, USSR
Журнал:
Superconductor Science and Technology
Дата:
1991-11-01
Аннотация:
The power gain and the noise temperature of a DC SQUID RF amplifier at a signal frequency 400 MHz were measured in the presence of external microwave radiation at 2 cm, 8 mm and 4 mm wavelengths. The authors used a four-loop planar DC SQUID with an integrated input coil and very low values of inductances and stray capacitances. In the noise measurements they used an SIS junction as a precise source of input noise at high DC bias voltage V<sub>b</sub>>V<sub>2 Delta </sub>. In such a configuration the studied system is the same as an SIS mm-wave mixer with a SQUID IF amplifier.
185.9Кб