Hello,
Please see the my circuit and waveform. This was supposed to be a simple 250 kHz square wave circuit to apply about 22 Vpp across the load resistor. The square wave is from a TTL output of a function generator. Why am I getting the 43 Vpp spike 400 ns after the non-inductive 8 ohm resistor is turned off? I never expected this much of a spike with a resistor. Looks like an inductor! I measured the L and phase angle of the resistor at 250kHz on a Wayne Kerr 3260. The inductance was about 100 nH and the phase angle -0.04 degrees (or 0?). My wires are short and neat. The reason for the 15V regulator is to power the gate driver which cannot have more the 20V. Any ideas or suggestions?
Thanks in advance,
Brad
Please see the my circuit and waveform. This was supposed to be a simple 250 kHz square wave circuit to apply about 22 Vpp across the load resistor. The square wave is from a TTL output of a function generator. Why am I getting the 43 Vpp spike 400 ns after the non-inductive 8 ohm resistor is turned off? I never expected this much of a spike with a resistor. Looks like an inductor! I measured the L and phase angle of the resistor at 250kHz on a Wayne Kerr 3260. The inductance was about 100 nH and the phase angle -0.04 degrees (or 0?). My wires are short and neat. The reason for the 15V regulator is to power the gate driver which cannot have more the 20V. Any ideas or suggestions?
Thanks in advance,
Brad
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