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An extended fukui‐like formula for the minimum‐noise figure of microwave fets
Author(s) -
Bonani Fabrizio,
Ghione Giovanni
Publication year - 1994
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650071208
Subject(s) - capacitance , microwave , equivalent circuit , admittance parameters , admittance , noise (video) , extension (predicate logic) , quadratic equation , third order , series (stratigraphy) , inductance , rlc circuit , electrical engineering , mathematics , materials science , physics , electrode , electrical impedance , voltage , engineering , computer science , quantum mechanics , capacitor , geometry , artificial intelligence , image (mathematics) , paleontology , philosophy , theology , biology , programming language
The article presents an extension of the well‐known Fukui formula for the minimum noise figure of microwave FETs, based on a complete small‐signal equivalent circuit including parasitic elements, the feedback capacitance C gd , and the output admittance (G ds and C ds ). We show that the simplified circuit neglecting all of the above elements, on which most Fukui‐like expressions are based, overestimates NF min , mainly because C gd is discarded; moreover, the linear approximation of NF min (f) from the complete circuit is more accurate than the quadratic one, while parasitic inductances affect the terms of the series expansion of NF min in powers of f from the third order only. © 1994 John Wiley & Sons, Inc.