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Negative voltage for drain in class-E power amplifiers

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Friends,

I would like to design a class E power amplifier. As you know, voltage and current waves of the switch in negative peak must be zero, but in my circuit they have negative values. When voltage is negative, current is positive!So, in this condition the switch can work as a source of power and can produce power!!! Is it a mistake or it really can happen? I do not have any idea about it!
Could you please help? 1.jpg
 

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