Actual capacitors always have some parasitic parameters, which are not obvious at low frequencies, but may be more important than the capacitance itself at high frequencies. is the SPICE model of an actual capacitor, ESR is the equivalent series resistance, ESL is the equivalent series inductance or parasitic inductance, and C is the ideal capacitance. Equivalent series inductance (parasitic inductance) cannot be eliminated, as long as there are leads, there will be parasitic inductance. This can be easily understood from the perspective of magnetic field energy change. When the current changes, the magnetic field energy changes, but it is impossible to jump in energy, showing inductance characteristics.