Intermodulation and Noise Power Ratio Analysis of Multiple-Carrier Amplifiers Using Discrete Fourier Transform

Tadashi TAKAGI  Satoshi OGURA  Yukio IKEDA  Noriharu SUEMATSU  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.6   pp.935-941
Publication Date: 1994/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Measurement Techniques for Microwave/Millimeter Wave)
intermodulation,  noise power ratio,  analysis,  measurement,  multiple carrier,  amplifier,  

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A novel analysis method of the intermodulation (IM) and the noise power ratio (NPR) of multiple-carrier amplifiers is descrided. This method, based on Discrete Fourier Transform, allows an accurate calculation of IM and NPR of the amplifier having multiple carriers by directly using measured single-carrier amplitude and phase characteristics. This method has an outstanding feature in that it can be applied to the general case of n carriers having an arbitrary power level as long as frequency-dependence of amplitude and phase characteristics is negligibly small. Applying this method to the linearized amplifier, a good agreement between measured and calculated results for IM3, IM5, and NPR has been obtained for operation from linear up to saturation, which shows this method would be a good candidate for calculating IM and NPR of multiple-carrier amplifiers.