Title :
A DC SQUID amplifier with a novel tuning circuit
Author :
Takami, T. ; Noguchi, T. ; Hamanaka, K.
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors report a SQUID (superconducting quantum interference device) amplifier with a novel tuning circuit that can be easily coupled to a finite-impedance source. The SQUID amplifier is designed for a source impedance of 50 Ω and a signal frequency of nearly 150 MHz. The performance of the SQUID amplifier has been measured at 4.2 K. The measured gain and noise temperature of the SQUID amplifier are 20 dB and 0.7 K, respectively. A saturation temperature as high as 200 K at the input of the SQUID amplifier is achieved. It is concluded that this type of tuned SQUID amplifier is applicable to the IF (intermediate frequency) amplifier of the SIS (superconductor-insulator-semiconductor) receiver
Keywords :
SQUIDs; radiofrequency amplifiers; tuning; 150 MHz; 20 dB; 4.2 K; 50 ohm; DC SQUID amplifier; IF amplifier; SIS receiver; finite-impedance source; gain; noise temperature; saturation temperature; signal frequency; source impedance; tuning circuit; Circuit optimization; Coupling circuits; Frequency; Gain measurement; Impedance; Interference; Noise measurement; SQUIDs; Signal design; Superconducting devices;
Journal_Title :
Magnetics, IEEE Transactions on
