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I have 2 questions please:
1. Could you tell me please what is the meaning of the numbers 0,200n,200n,800n,2u?
2. Even if the lower limit of the voltage source is 2V, how come the diode stays in forward state all the time?
1. I not completely familiar with the syntax, but I believe the 200n and 200n are the 200ns rise and fall times, the 800n is the 800ns flat portion of the pulse, and the 2u is the 2us waveform period.
2. The diode always has a positive voltage applied to it's anode with a minimum of +2V. What's not to understand about that keeping it forward biased? As long a diode has a more positive voltage on its anode then its cathode, it will remain forward biased.