Title :
Low-Frequency Noise Sources and Gain Stability in Microwave Amplifiers for Radiometry
Author :
Gonneau, Eric ; Escotte, Laurent
Author_Institution :
Simulation Instrum. et Mater. pour l´´Anal. Dosimetrique (SIMAD), Univ. de Toulouse, Toulouse, France
Abstract :
In this paper, the impact of low-frequency noise sources on the gain stability of microwave amplifiers is presented. The presence of a thermally activated relaxation process is experimentally demonstrated. To support the experiment, a mathematical model of this additional excess noise source is proposed in the Allan variance analysis. Different microwave amplifiers are also characterized and their stability is compared with the use of the Allan variance.
Keywords :
mathematical analysis; microwave amplifiers; radiometry; Allan variance analysis; gain stability; low-frequency noise sources; mathematical model; microwave amplifiers; radiometry; thermally activated relaxation process; Microwave radiometry; Microwave theory and techniques; Noise; Noise measurement; Stability analysis; Temperature measurement; Thermal stability; Allan variance; amplifiers; gain fluctuations; stability;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2012.2202681
