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Journal of Applied Mathematics
Volume 2016, Article ID 8710860, 9 pages
Research Article

Theoretical Analysis of the Noise Power Ratio of Nonlinear Power Amplifiers

Department of Electrical Engineering, California State University, Long Beach, CA 90840, USA

Received 29 July 2016; Revised 27 October 2016; Accepted 31 October 2016

Academic Editor: Mehmet Sezer

Copyright © 2016 Rajendra Kumar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a theoretical analysis and derives the amplifier output noise power spectral density result in a closed form when the input to the amplifier is a band limited Gaussian noise. From the computed power spectral density the NPR is evaluated by a simple subtraction. The method can be applied to any amplifier with known input-output characteristics. The method may be applied to analyze various other important characteristics of the nonlinear amplifier such as spectral regrowth that refers to the spreading of the signal bandwidth when a band limited signal is inputted to the nonlinear amplifier. The paper presents numerical results on the NPR as a function of the noise bandwidth, depth level of the notch, and the output power back-off obtained from the analysis presented in the paper.