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Meaning of VCC FILTERING

 
Computing Dictionary
 
 Definition: 

A technique for reducing the amount of radio frequency interference spread via power supply connections. vcc is a common name for the non-ground power supply line in circuits based on bipolar transistors.

When part of a circuit generates lots of radio-frequency noise, that portion of the power plane can be isolated from the rest of the circuit and power delivered to it via a low pass filter, usually a pi filter, as shown in the diagram below.

      source   ________inductor_________   load
                  |                |
              capacitor        capacitor
                  |                |
               ground           ground

This helps to shield the rest of the circuit from the noise generated by the load.

 

 

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