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test bench about diode reverse recover time

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nelly1

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Hello everyone..
I know it's maybe a stupid question but i can't find a proper testbench to know the diode recovery time.
I used a pulse signal with -2V-2V, and with the current , i didn't see any strike....

by the way, is there any recover time for mos diode?????

diode1.jpgdiode2.jpg
 

dick_freebird

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A majority carrier diode (MOS, Schottky) should have no
recovery "porch", just the depletion capacitances to
discharge. A bipolar diode (PN or BJT junction) will in
reality; model quality is always a question and small
signal transistors may simply assume no saturation
and have no proper modeling depending on plans and
laziness.

I would recommend using a series resistor and vpulse,
the forward (V-Vf)/R sets your forward current which
is a primary "knob" on charge stored (QRR). The reverse
time will also be modulated by the impedance and a
stiff voltage source would only be limited by diode
Rs, which might make the timescale unreasonably
short and more to the point, application-unrealistic.
 

nelly1

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thanks for your recommendation! But when i used mos diode as normal PN diode in a buck converter, I also saw a current which looks like a "reverse recovery current" though my mos diode like picture shows below. So i wonder if this happens because the depletion capacitances need to discharge.
View attachment 84123
 

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