Understanding capacitive decoupling from the perspective of impedance can bring great convenience to the design of power distribution systems. In fact, the most fundamental principle of power distribution system design is to minimize impedance. The most effective design methods are guided by this principle.
Correct use of capacitors for power supply decoupling requires an understanding of the frequency characteristics of actual capacitors. Ideal capacitors do not exist in practice, which is why “capacitors are more than just capacitors” is often heard.