photodiode mode

Question

Photodiode typically operated in?

RankGuru · Accepted Answer

1. **Definition**: A photodiode is a PN junction device used to detect light signals.
2. **Operational Mode**: It is intentionally operated under **reverse bias** conditions.
3. **Reasoning**: In reverse bias, the dark current (current without light) is very small. When light strikes the depletion region, it creates new electron-hole pairs.
4. **Sensitivity**: These photo-generated carriers increase the reverse current significantly. The **fractional change** in reverse current due to light is much larger and easier to measure than the fractional change in forward current would be.
5. **Proportionality**: The reverse photocurrent is directly proportional to the incident light intensity.

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photodiode mode

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