There are several well-known growth models (Monod, Moser, Tessier and Contois) often viewed as no difference except data fitting. With frequency response analysis, it is shown that periodic operation is suitable to differentiate these models. Estimation of system parameters by this method is also discussed. Additionally, the vertical distance between the intersection of two asymptotes and amplitude ratio curve in Bode diagram is found to be always log(root 2) for a constant yield factor case.