What is the Use of a Decoupling Capacitor?


  1. System noise has become a critical issue for both analog and digital devices. 
  2. The requirement for speedy interfaces and lower power consumption has resulted in devices being sensitive to disturbances from power and signal lines. 
  3. A decoupling capacitor or bypass capacitor in a circuit provides high transient currents to an IC and reduces power ripples. 
  4. Such capacitors are placed close to the power pins of an IC.
  5. Analog circuits such as audio amplifiers produce a hum or a crackling noise during operation, while digital circuits such as micro-controllers exhibit erratic and unpredictable behavior. 
  6. It happens because the input voltage is not stable. 
  7. Any device will perform accurately if variations such as glitches, voltage spikes, and AC components remain within the tolerance. 
  8. A good PCB design must ensure smooth input voltage by addressing intra-system power noise with adequately placed decoupling and bypass capacitors.

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