Title :
Determining optimum load impedance for a noisy active 2-port network.
Author :
Ciccognani, Walter ; Giannini, Franco ; Limiti, Ernesto ; Longhi, Patrick Ettore ; Serino, Antonio
Author_Institution :
Univ. di Roma Tor Vergata, Rome
Abstract :
The role of the impedance load when dealing with noisy two port networks is investigated. Its value acts directly on input and output return losses (IRL and ORL) that can be simultaneously achieved once input load has been fixed to an arbitrary value. A novel design chart, obtained after examining constant mismatch circles, is introduced, where optimum trade-off between IRL and ORL is promptly identified. The role of degenerative source feedback is highlighted to improve IRL/ORL trade-off.
Keywords :
active networks; feedback; low noise amplifiers; constant mismatch circles; degenerative source feedback; input return loss; low noise amplifiers; noisy active 2-port network; optimum load impedance; output return loss; Active noise reduction; FETs; Impedance matching; Low-noise amplifiers; Microwave devices; Noise figure; Output feedback; Performance gain; Reflection; Stability;
Conference_Titel :
Microwave Conference, 2007. European
Conference_Location :
Munich
Print_ISBN :
978-2-87487-001-9
DOI :
10.1109/EUMC.2007.4405464
