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N-MOS simulation problem
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stymop 7 years ago
Hello, I have a problem with a simple simulation: I try to load a capacitor and activate a N-MOS when the necessary voltage is reached. But when I simulate this, the high value of the voltage on C is around 1V instead of 5V. Maybe it is like a NPN transistor. But I put a MOS, not a bipolar transistor. do you know what is the problem ? Notice : If I remove the MOS, the capacitor is charged up to 5V. ![schematic][1] [1]: https://easyeda.com/normal/New_Schematic-19973a48a2b14554a1888e1f97492770
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stymop 7 years ago
Sorry, there was a problem with the schematic sharing. The pictre is not good. This is the schematic link : [schematic][1] [1]: https://easyeda.com/editor#id=19973a48a2b14554a1888e1f97492770
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andyfierman 7 years ago
Hi Stymop, Welcome to EasyEDA. The problem is that you have chosen a transistor that has no spice model associated with it. Spice simulation is strict about what you call a device too. You have placed a symbol for a MOSFET which has a Spice prefix of `Q` (select the symbol and press `I` to see this) whereas Spice expects a prefix of `M` for a MOSFET .model defined model or `X` for a .subckt defined model. To help you on your way, please see: https://easyeda.com/forum/topic/How_to_find_simulatable_parts_in_EasyEDA-1YgasK2kC
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EasyEDA 7 years ago
There is now an IRF3205PBF spice symbol with model attached in: `SHIFT+F > System Components > Spice Discrete`
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stymop 7 years ago
Thank you for your support. It is correct with this component.
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