The zero-bias capacitance of a silicon pn junction diode is Cjo = 0.02 pF and the built-in potential is Vbi = 0.80 V. The diode is reverse biased through a 47-kfi resistor and a voltage source, (a) For t<0, the applied voltage is 5 V and, at t = 0, the applied voltage drops to zero volts. Estimate the time it takes for the diode voltage to change from 5 V to 1.5 V. (As an approximation, use the average diode capacitance between the two voltage levels.) (b) Repeat part (a) for an input voltage change from 0 V to 5 V and a diode voltage change from 0 V to 3.5 V. (Use the average diode capacitance between these two voltage levels.)
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