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Some limiting factors for the noise optimization of recursive active microwave integrated filters

✍ Scribed by R. Malmqvist; M. Danestig; S. Rudner; C. Svensson

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 210 KB
Volume: 22
Category: Article
ISSN: 0895-2477
DOI: 10.1002/(sici)1098-2760(19990805)22:3<151::aid-mop2>3.0.co;2-3

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✦ Synopsis

A theoretical analysis of the optimum noise figure for two topologies of recursi¨e acti¨e filters is presented. Our results show that it is important to consider the losses of the passi¨e couplers and the filter Q-¨alue when selecting the recursi¨e acti¨e filter topology with the lowest possible noise figure.

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In this paper, three topologies of microwa¨e acti¨e recur-si¨e filters are studied. We show how, using a noise wa¨e formalism, the noise factor of filters can be effecti¨ely minimized by using appropriate unbalanced power di¨idersrcombiners and an amplifier. A comparison between the different topolo