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A Si photodiode with a 1 mm^2 area has a dark current i_drk = 0.5 nA...

A Si photodiode with a 1 mm^2 area has a dark current i_drk = 0.5 nA and a responsivity, R = 0.2 A/W at 500 nm. It is operated with (reverse) bias. Assume B_3dB = 10 Hz electrical bandwidth and 500 nm monochromatic light. Do NOT include amplifier Johnson noise.

(a) What is its quantum efficiency, ηqe?

(b) What is its dark current noise?

(c) What is the photon equivalent of the dark current noise?

(d) What is the noise equivalent power? What is the detectivity D?

(e) What is the normalized detectivity, D∗ ?

(f) If a subsequent amplifier has a 100 MΩ feedback resistor, what is the (Johnson) noise for the amplifier?

(g) What would the noise equivalent power be for the combination? What would D be for the combination?

science   Advanced-Physics   
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