A low-order nonlinear amplifier model with distributed delay terms

作者：Yuzer Ahmet Hayrettin^*; Demir Simsek

来源：Turkish Journal of Electrical Engineering and Computer Sciences, 2014, 22(4): 1007-1016.

DOI：10.3906/elk-1208-25

• Behavioral model
• asymmetric IMD
• AM/PM conversion
• nonlinear characterization

In this paper, a novel behavioral modeling technique for the characterization of memory effects of amplifiers is proposed. This characterization utilizes asymmetric intermodulation distortion (IMD)components, which are the result of a 2-tone excitation of a nonlinear amplifier. These asymmetric IMD components are represented basically by a power series, where each term in the series has its own time delay term. These time delay terms successfully justify the presence of asymmetry in the intermodulation components, which leads to the prediction of amplitude-to-amplitude and amplitude-to-phase distortions. The parameters of the model are extracted using 2-tone measurements. A 100-W peak power amplifier is examined. Model predictions are verified by the measurement results of a 4-tone stimulus. The proposed model can also be used in time domain analysis with arbitrary excitation.

• 出版日期2014