Amplificadores criogénicos de muy bajo ruido en microondas y ondas milimétricas

Abstract

Cryogenic cooled very low noise amplifiers are critical components in radio astronomy receivers and other applications. A general description of these devices and their role in receivers is presented. Several examples of microwave and millimeter wave amplifiers covering bands from 4 GHz to 36 GHz are described. Noise temperatures of about 5 K in 4-12 GHz and 15 K in 25-34 GHz bands have been achieved in mHEMT technology based amplifiers.