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Spice simulation(ISIS PROTEUS) - strange impulses on graph?

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ifryd

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isis proteus

Hi folks.

I have problem with my simulation is ISIS Proteus software.
Generally it works as I want but I get strange impulses when MOSFET keys switch from one state to another. I assume it is an impact of capacitance on Mosfets? Anyway I don`t need these impulses on graph as I want to present only an idea of the algorithm. Please could you tell me what options I should change in SPICE simulator to generate less precise graph.
Is somwhere a reference with detailed description of Spice simulation options?

Below I attach picture of this graph.

Thanks in advance

Ifryd
 

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