Modeling NonIdeal Inductors in SPICE Intusoft（建模在香料Intusoft理想电感）.pdf

Modeling Non-Ideal Inductors in SPICE Martin O’Hara Technical Manager, Newport Components, U.K. November 8 1993 Abstract The non-ideal inductor exhibits both resonance and non-linear current characteristics. These effects can be modelled in SPICE by adding only 3 additional elements to model the real inductor characteristics of dc resistance, wire capacitance and magnetic core loss. The values for these model parameters can all be obtained from standard data sheet parameters via a few simple calculations. The resulting model gives accurate impedance and phase simulations over a wide frequency range and over the peak resonance frequency. The dc current saturation characteristics is modelled by a simple 2nd order polynomial that gives a close simulation to measured performance over 2.5 times the recommended dc current limit. Comparisons of measured inductor performance and simulation results are given to illustrate the proximity of the models to real inductor behaviour. Introduction phase with the applied voltage and there would be no effect Modelling of inductors and inductive elements in SPICE of DC current bias on the behaviour of an ideal inductor. has always been of low importance to analogue designers. This is partly because SPICE was developed primarily for If we compare the measured frequency response for the im- IC design where inductive elements are usually parasitic and pedance of a real inductor to the ideal model we can see two very small. distinct