4.32 We wish to use a reverse-biased photodiode with responsivity of 0.3 A/W as a light sensor. Our objective is to sense light illuminating the photodiode with an intensity of 10 mW/m2. What should the surface area of the photodiode be in order to produce 1 µA of current (neglecting dark current)? If at a particular reverse-bias voltage the photodiode exhibits 10 pF capacitance per mm2 of surface area, estimate the photodiode capacitance.
3.3 cm2; 3.3 nF