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Engineering · Electrical Engineering
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A photodiode has a responsivity of 0.4 mA (mW)-1. A 20 MHz, 0.5 optical signal is to be detected. If a sensitivity of IV (mW is required what value of load resistor would you choose? .What would the value of depletion layer capacitance Cd need to be? (Note: sensitivity(Wd) RrL where, R is responsivity and rL s load resistor; BandwidthýdB = 1/2πr.cd. For simplicity there is no need to consider the parasitic resistance/capacitance/inductance of the device.)

Ans:2.5k ohms; 3.18 pF

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