Accounting of nonlinearity in OTA macromodel, applicable for syn-thesis of high-order active filters
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Abstract
The article discusses the development of the nonlinearity model of operational transconductance amplifier. The analysis of existing approaches using Taylor polynomial is described accounting the method’s shortcomings. The main part presents the orthogonal Chebyshev approximation method. The author gives the balanced OTA calculation results, focusing on the reduction of the maximum approximation error, reduced sensitivity to calculation rounding errors, as well as the possibility of application of high-degree polynomials using the proposed approach. The paper also raised the model’s integration into CAD systems issue. In conclusion, the results of nonlinear macromodel verification are given, showing the high accuracy of imitating the characteristics of a low-level transistor model. The possibility of application of macromodel for the synthesis of high-order active filters was highlighted, as well as high precision evaluation of filter performance and harmonic distortion.
Reference 11, figures 11.
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