The APTC3-00100200-0905-D4 from AmpliTech is a low noise Cryogenic amplifier that operates from 100 MHz to 2 GHz. The amplifier provides a gain of 35 dB with a noise figure of less than 1.49 dB and an output power of up to 5 dB. It is available in a module with 50-ohm connectors.