Cryogenic microwave amplifiers for precision measurements.
The noise performance of two cryogenic HEMT amplifiers has been studied. The effective noise temperature for each amplifier is shown to be close to the 6 K thermodynamic temperature before a power threshold of about -70 dBm is achieved.
Ivanov
E N
EN
Dept. of Phys., Western Australia Univ., Nedlands, WA, Australia.
Hartnett
J G
JG
Tobar
M E
ME