Title :
Low noise cooled microwave amplifiers-simulation and design
Author :
Angelov, Iltcho M. ; Stoev, I.K. ; Ivanov, Zdravko G. ; Todorov, Bogdan N. ; Spasov, A.Y. ; Kollberg, Erik L. ; Lindström, C.O. ; Wendemo, B.L.
Author_Institution :
Inst. of Electron., Bulgarian Acad. of Sci., Sofia, Bulgaria
fDate :
2/1/1992 12:00:00 AM
Abstract :
The results of a study of cooled low noise field effect transistors and transistor amplifiers are presented. The investigations were made over a broad range of temperature and frequency. The temperature dependence of equivalent circuit elements in the transistor model is reported. This makes it possible to extrapolate with sufficient accuracy the S-parameters up to frequencies where direct measurements are difficult. Suspended microstrip lines have been used in the amplifier designs in order to minimize the losses and to improve the mechanical stability. The results of the theoretical studies are illustrated with a presentation of cooled amplifiers for the ranges 0.5-4 GHz, 3.7-4.1 GHz, 4.8-5.2 GHz, 19-23 GHz and 26-28 GHz, which are designed on the basis of the theoretically obtained parameters
Keywords :
cooling; field effect transistors; microwave amplifiers; solid-state microwave circuits; solid-state microwave devices; 0.5 to 28 GHz; FET amplifiers; S-parameters; SHF; UHF; cooled amplifiers; cooled low noise field effect transistors; cooled microwave amplifiers; equivalent circuit elements; extrapolation; low noise amplifiers; mechanical stability; microwave amplifiers; suspended microstrip lines; temperature dependence; transistor model; Circuit noise; Equivalent circuits; Frequency; Low-noise amplifiers; Microwave FETs; Microwave amplifiers; Microwave transistors; Scattering parameters; Temperature dependence; Temperature distribution;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
