A New Approach for Modeling the Nonlinearity of Analog to Digital Converters Based on Spectral Components

Abstract

This paper presents a novel modeling approach for analog to digital converters (ADCs). The non linearity of the converter is modeled using a linear combination of Chebyshev polynomials. The model relies on a fast Fourier transform (FFT) test applied to the output of the ADC. The harmonics extracted from the FFT test are the coefficients of the Chebyshev polynomials. The model appears to be much faster, compared to real circuits and models developed with other techniques, without losing much accuracy. The proposed model is convenient for all architectures of ADCs with high resolution bits