Cryogenic performance of HEMT amplifiers at 340GHz and 670GHz

Abstract

The cryogenic performance of HEMT amplifiers operating above 300 GHz is presented for the first time. InP HEMT amplifiers designed for room temperature operation are cooled to 25 K and their sensitivity is characterized using the Y-factor method. Minimum noise temperatures of 400 K and 550 K are achieved at 340 GHz and 670 GHz, respectively.