Capacitors are often overlooked. Capacitors have neither billions of transistors nor the latest sub-micron fabrication processes. In the minds of many engineers, a capacitor is nothing more than two conductors with an insulating electrolyte in between. All in all, they are one of the lowest class electronic components.
Engineers usually solve the noise problem by adding some capacitors. This is because they generally see capacitance as a “magic bullet” for noise-related problems, and rarely consider parameters other than capacitance and voltage rating. However, like other electronic components, capacitors also have defects, such as parasitic capacitance, inductance, non-ideal characteristics such as capacitance temperature drift and voltage offset.