ABSTRACT
This chapter describes Capacitance and Capacitors of Electronic Systems. A wide variety of capacitors are in common usage. Capacitors are passive components in which current leads voltage by nearly 90° over a wide range of frequencies. A metallized foil capacitor use: two layers, each of which has a very thin layer of metal evaporated on one surface, thereby obtaining a higher capacity per volume in exchange for a higher equivalent series resistance. Metallized foil capacitors are self-repairing in the sense that the energy stored in the capacitor is often sufficient to burn away the metal layer surrounding the void in the plastic film. Ceramic capacitors come in various shapes, the most common being the radial-lead disk. Tantalum electrolytic capacitors are the capacitors of choice for applications requiring small size, low equivalent series resistance, and low leakage current. An aluminum electrolytic capacitor has a typical tolerance range of about 20%.
