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00925njm 22002777a 4500 dc O'Callaghan Castellà, Juan Manuel author 1991 General considerations on the measurement of noise parameters in highly mismatched systems are discussed. In particular, the problem of noise characterization of active superconducting microwave devices is addressed. A measurement technique that includes an error analysis is presented along with current data for a superconducting flux flow transistor. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica Noise--Measurement Electric noise measurement Microwave measurement Solid-state microwave devices Superconducting junction devices Soroll--Mesurament Requirements for noise parameter measurements in superconducting electronic systems