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The 2N6660 Mosfet is very old and is obsolete so maybe your SIM program knows nothing about it.
The circuit you showed is a voltage booster that should have a continuous input from an oscillator, not just one pulse.
I wonder why the NPN transistor has an emitter resistor that prevents the Mosfet from completely turning off.
Is the load actually only 1 ohm as shown by R1? Then the little old Mosfet is overloaded because its on resistance is 200 times higher than a modern Mosfet.
The pulse that I'm sending is a periodic signal !The circuit you showed is a voltage booster that should have a continuous input from an oscillator, not just one pulse.
Why did you add a resistor in series with the source pin of the Mosfet?
I simplified the schema (see my last post pls), now I send the pulse directly to the FET.I don't really understand why the OP is using a BJT to switch the FET instead of controlling the FET directly....?
That's what I did, but still I can't activate de mosfet. I tried with the IRF3711 fet, and also with a generic one.Try a square wave 5V or 10V peak signal as the input.
DELMIN increased to 2.2e-16 due to lack of time precision
transient GMIN stepping at time 1.2
TRAN: Timestep too small, timestep=2.77e-16: trouble with instance D1