High performance analog behavioral modeling of operational amplifiers

This paper presents a new method of operational amplifiers SPICE macromodeling, based on a frequency domain description of the input-output transfer functions. It accurately models the frequency variations of the open-loop gain, the common-mode rejection, and the input and output impedances, by a direct specification of their Laplace domain expressions with all theirs dominant poles and zeros. The temperature dependencies of the main opamp characteristics are also included. The proposed behavioral macromodel leads to a low analysis time in comparison with the other opamp methods of modeling, with a higher accuracy and a better convergence