Hi,

When i drive a signal in to a MOSFET driver, i notice that there is a substantial amount of overshoot and it rings.
I also find that this is the case when i drive a MOSFET, but the overshoot is significantly higher and it rings for much longer.

I assume this mean that my circuit/traces has a high Q factor.

How do i go about determining the Q factor of the traces/circuit?
And how do i go about designing matching circuits to solve this?

I've read about matching circuits such as an LC matching filter but i feel massively lost.

Thanks

 

Over shoot and ringing is a sign of poor grounding, lack of decoupling capacitors, and or poor layout. "Q" has nothing to do with it.

 

99.9% - Think horses: Les is right.
0.01% - Not zebras: In switching power supplies, the power device internal capacitances and package lead/trace inductances can form resonant circuits and ring at surprisingly high frequencies (hundreds of megahertz).

ak

 

This kind of problem is usually fixed by amputating mistakes, not adding complication.