Contents
How to reduce loop inductance?
When a decoupling capacitor is placed close to the IC power pins, the area of mutual inductance can effectively lower the path loop inductance. In order for this to be significant, the placement of the capacitor and IC must be close together.
How can PCB inductance be reduced?
Minimizing Inductance
- Place as many high-speed ICs as possible on one of the two component layers (let’s say it’s the top).
- Arrange the power and ground planes so that they are adjacent and closer to the top layer.
- Place all the decoupling caps on the top layer so that they have short connections to the planes.
What does an inductor do on a PCB?
Simply put, inductors resist a change of current, and can act as a low pass filter when in series with the signal or power supply flow. Inductors do this by storing energy in the flux surrounding the conductor.
How does mutual inductance in a PCB work?
This is due to the current flowing in opposite directions, resulting in opposing magnetic fields. Mutual inductance can be increased by decreasing the distance between the traces (reducing the loop area) and by increasing the width.
Which is an example of a circuit with inductance?
Inductance is the ability to store energy in a magnetic field. The inductance of a wire loop is a common textbook example of a circuit with inductance. The variables used in this tool are the diameter of the wire conductor and the diameter of the wire loop. This calculation is for loop and self inductance they are the same for this example.
What causes self inductance in a PCB trace?
If you move the two currents apart (by the thickness of the PCB for example) some of the field will be cancelled (mutual inductance) but some would not, which is what causes the self inductance.
How can mutual inductance be increased in a loop?
Mutual inductance can be increased by decreasing the distance between the traces (reducing the loop area) and by increasing the width. I believe this has to do with how the magnetic field is distributed around the trace, but this comes down to a physics question.