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A decoupling capacitor provides a bypass path for transient currents, instead of flowing through the common impedance. [1] The decoupling capacitor works as the device’s local energy storage. The capacitor is placed between the power line and the ground to the circuit the current is to be provided.
A common example is connecting localized decoupling capacitors close to the power leads of integrated circuits to suppress coupling via the power supply connections. These act as a small localized energy reservoir that supply the circuit with current during transient , high current demand periods, preventing the voltage on the power supply rail ...
In a regulator not employing droop, when the load is suddenly increased very rapidly (i.e. a transient), the output voltage will momentarily sag. Conversely, when a heavy load is suddenly disconnected, the voltage will show a peak. The output decoupling capacitors have to "absorb" these transients before the control loop has a chance to ...
Printed circuit boards—metal conductive areas in different layers of a multi-layer printed circuit board can act as a highly stable capacitor in Distributed-element filters. It is common industry practice to fill unused areas of one PCB layer with the ground conductor and another layer with the power conductor, forming a large distributed ...
An alternative name is bypass capacitor as it is used to bypass the power supply or other high impedance component of a circuit. Decoupling capacitors need not always be discrete components. Capacitors used in these applications may be built into a printed circuit board, between the various layers.
In the Computer industry, the increasing power demands of Microprocessors necessitated dedicated decoupling capacitor designs for power supply buses on printed circuit boards. [ 2 ] [ 3 ] As a microprocessor transitions between idle and heavy computation states, it draws rapidly changing current from its power supply unit, often referred to as ...