A nonlinear macromodel for integrated circuit operational amplifiers has been developed for frequency-domain analysis. lie main difference between this macromodel and those previously reported in the ikerature is that this model considers the iofhence of frequency and amplitude on the transfer function of the operational amplifier. l%e macromodel also includes the slew-rate effect on the open-loop frequency response and output-voltage distortion computed from the Fourier coefficients. The benefits of tbe developed macromodel are demonstrated by several examples, showing that the simulation is in goad agreement with tbe experimental results. One important application of this macromodel is suggated to be in tbe computation of the dynamic range of active filters.