Volterra Analysis Using Chebyshev Series

— The paper presents a new approach to the Volterra analysis of analog circuits. This kind of analysis is widely used for the calculation of distortion and intermodulation products. However, the analysis is limited to circuits with small signal excitations and becomes inaccurate when the input signal amplitude increases, especially when MOSFETs are involved. In this paper, we analyze the reasons of this drawback, which is no other than the Taylor series’ convergence properties. Furthermore, we propose a solution, by calculating the nonlinearity coefficients using a different type of polynomial expansion, the Chebyshev series. We also present results comparing Chebyshev series performance with other types of polynomial expansions. Finally, we apply the proposed method to analyze the intermodulation distortion (IMD) of a CMOS RF power amplifier.

• Type: Conference
• Year: 2007
• Where: ISCAS
• Authors: Ioannis Sarkas, Dimitrios Mavridis, Michail Papamichail, George D. Papadopoulos
• Keywords: Chebyshev Series, ISCAS 2007, Polynomial Expansions, Signal Amplitude Increases