Gain and noise analysis of HEMT amplifiers from room temperature to superfluid He

Details Gain and noise analysis of HEMT amplifiers from room temperature to superfluid He Gain and noise analysis of HEMT amplifiers from room temperature to superfluid He

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cqgra..23s.293c&link_type=abstract

Classical and Quantum Gravity, Volume 23, Issue 8, pp. S293-S298 (2006).

Physics

4

Scientific paper

We are developing a microwave parametric transducer to be installed on massive gravity wave antennas, like bars and spheres. This transducer is based on the high sensitivity of a superconducting RF cavity to the change of the appropriate geometrical dimension. To fully exploit the transducer sensitivity, a very low noise amplifier, at the operating frequency of a few GHz, is required. We describe the experimental set-up and the test procedure that has been used to measure the noise temperature and the gain of the LNA at several temperatures, from 300 K to 1.5 K. The influence of imperfect impedance matching with the temperature change is investigated. A commercial GaAs LNA in the frequency range 1 3 GHz has shown a noise temperature TN <= 4 K at 4.2 K and below.

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