Abstract: In this paper, a novel radiofrequency circuit is designed and developed for an integrated on-chip spiral inductor and inter-digital capacitor of the substrate. Results of extensive simulations concerning the influence of both spiral inductor and inter-digital capacitor geometrical parameters on quality factor value are presented. Two scenarios are considered in the simulation; the first operation of buck converter including an ideal capacitor and inductor and then its operation including an inter-digital capacitor and integrated spiral inductor. For both scenarios, we observed that their respective output voltages as well as their respective output currents present the same time responses.