Question: If the DC bias voltage, Vd , across a reverse biased PN step junction is equal to - 1 . 9 V then what is

If the DC bias voltage, Vd, across a reverse biased PN step junction is equal to -1.9V then what is the capacitance of this junction in femto Farads? Assume that Cj0 for the junction is equal to 22.2 fF.(Note that 1 fF =1 femto Farad =1 x 10^-15 F.) Also assume that the built-in voltage for this junction is equal to 657mV.

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