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Capacitor in pin diode model

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ssayan79

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Hi to all

I have a question. I know that when a pin diode is inversally polirized or in condition of zero bias, the model include a capacitor parallel to a resistor. Could someone explain to me why is better when this capacitor has a low value??

thanks a lot
 

Hi, I think what you said is the dynamic behavior of diode. Under the situation, the diode is equated to a nonlinear capacitor in series a res. And the cap combines excess minority carrier charge and the space charge. Maybe small cap means fast transit time.
 

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