VCC filtering

electronics A technique for reducing the amount of RadioFrequency 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 lowpass 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.

(1998-01-26)