|
Português |
THE LNA for the front end stage should have a low temperature. After design at room temperature with super-low noise commercial pHEMT with GaAsIn technology (Mitsubishi and NEC), we opted for the InP HEMT based cryogenic amps from the Low Noise Factory , Sweden (Chalmers University of Technology). The LNAs have a BW of 4GHz (4-8GHz) and a Tnoise=6K @ 77K cooling (GEM criocooler), or about 3.5K Tnoise @ 10K, which are the lowest noise available LNAs. |
|