VCC is a common name for the non-
ground power supply line
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)