When we connect load to the power supply, we need to provide the voltage within the specifications of the load. For example, if we have Microcontroller which needs 3.3 with a tolerance of +/-10%, we need to provide voltage within those tolerances else we might risk malfunctioning or non-functioning of the microcontroller. So, the impedance between the power supply output and load is very important. This impedance is called the PDN impedance as power distribution is what we are doing.
PDN impedance depends on:
- Capacitor values
- Capacitor count
- Capacitor placement
- Power planes
- Board stack up
- VIA used on the board
- Power supply specs
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