Large and small signal distortion analysis using modified Volterra series

Authors:
Ioannis Sarkas;Dimitrios Mavridis;Michail Papamichail;George Papadopoulos
Affiliations:
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada M5S3G4;Applied Electronics Laboratory, Department of Electrical and Computer Engineering, University of Patras, Patras, Greece;Applied Electronics Laboratory, Department of Electrical and Computer Engineering, University of Patras, Patras, Greece;Applied Electronics Laboratory, Department of Electrical and Computer Engineering, University of Patras, Patras, Greece
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2008

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Abstract

A new approach to the Volterra analysis of analog circuits is presented. Volterra analysis is widely used for the calculation of harmonic and intermodulation distortion products. However, the analysis is limited to circuits experiencing small signal excitations and becomes inaccurate when the input signal amplitude increases, especially when MOS transistors are involved. In this paper, we analyze the cause of this drawback, which is no other than the Taylor series' convergence properties. Moreover, we propose a solution, by calculating the nonlinearity coefficients using a different type of polynomial expansion, the Chebyshev series. This replacement improves significantly the capabilities of Volterra analysis. We also present results comparing Chebyshev series with other types of polynomial expansions. Finally, we apply the proposed method to analyze the intermodulation distortion (IMD) of a CMOS RF power amplifier, both in the small and the large signal regimes.