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FBI agent , 12-25-2023, 01:23 PM

Hi all, I wonder what is the inductive effect on the pcb's traces and vias. Are we calling as inductance to the mangetic propagation that goes from current-carrying and time-varying signals to the victims. At the same time, the magnetic field lines or magnetic flux lines are overlapping at the corner points and varying return current paths. Consequently, the magnetic flux density increases. So these situations are called as inductance ? Please make me correct or specify my fault. Thanks in advance.

QDrives , 12-25-2023, 08:50 PM

All conductors that carry a current will induce a magnetic field. However, depending on the situation, at least when it is intended, we call them inductors. When going into the details, every conductor is an inductor (and resistor and capacitor).
That magnetic field can couple into other traces and vias (if running in parallel) and create cross talk.

The parasitic properties (resistance, inductance and capacitance) of the conductors filters (distorts) the signal. This varies with frequency.
As a square wave is composed of multiple sinusoidal signals at different frequencies, and the filtering effect varies with frequency, the square wave will be distorted. This can be up to a point that the original (digital) signal can no longer be detected.
The filtering effect also makes the signal propagation slower. This becomes important for high speed signals where the rise time (at the receiver) must be considered.

FBI agent , 12-26-2023, 05:42 AM

Thanks for your understanable comment. It was so clear. Thanks sir.