Noise figure of a balanced amplifier
Date
2018
Authors
Coskun, A. A.
Atalar, Abdullah
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
IEEE Transactions on Circuits and Systems II: Express Briefs
Print ISSN
1549-7747
Electronic ISSN
Publisher
Institute of Electrical and Electronics Engineers
Volume
65
Issue
9
Pages
1129 - 1133
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Series
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.