Noise figure of a balanced amplifier
Author
Coskun, A. A.
Atalar, Abdullah
Date
2018Source Title
IEEE Transactions on Circuits and Systems II: Express Briefs
Print ISSN
1549-7747
Publisher
Institute of Electrical and Electronics Engineers
Volume
65
Issue
9
Pages
1129 - 1133
Language
English
Type
ArticleItem Usage Stats
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Abstract
Noise figure expression of a balanced amplifier built with lossy divider and combiner and two imperfectly noise-matched component amplifiers is derived analytically using the method of noise waves in terms of the noise parameters of the amplifiers. We present analytical expressions for the three noise parameters of the balanced amplifier. We show that a low-noise amplifier optimized to be used as a stand-alone amplifier is not the optimum choice for the component amplifiers of a balanced amplifier. The derived expressions can be used to choose or optimize the component amplifiers.