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==Discussion==
Active devices of an [[electronic system]] (e.g. [[transistor]]s, [[integrated circuit]]s, [[vacuum tube]]s) are connected to their [[power supplies]] through [[Electrical conductor|conductors]] with finite [[Electrical resistance and conductance|resistance]] and [[inductance]]. If the [[Electric current|current]] drawn by an active device changes, the [[voltage drop]] from the power supply to the device will also change due to these [[Electrical impedance|impedance]]s. If several active devices share a common path to the power supply, changes in the current drawn by one element may produce voltage changes large enough to affect the operation of others – [[voltage spike]]s or [[ground bounce]], for example – so the change of state of one device is coupled to others through the common impedance to the power supply. A decoupling capacitor provides a bypass path for [[Transient response|transient]] currents, instead of flowing through the common impedance.
The decoupling capacitor works as the device’s local [[Electric field|energy storage]]. The capacitor is placed between the power line and the [[Ground (electricity)|ground]] to the circuit the current is to be provided. According to the [[Capacitor#Current–voltage relation|capacitor current–voltage relation]]
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