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lab05_en:inverting_op-amp_photo_diode_as_current_source [2026/04/28 16:11] – mexleadminlab05_en:inverting_op-amp_photo_diode_as_current_source [2026/05/07 12:37] (current) – mexleadmin
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 === Photodiode as current source === === Photodiode as current source ===
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 +A photodiode is a special type of diode which, **in the absence of light**, exhibits a **current-voltage relationship** very similar to that of a standard diode (see the **dark current** characteristic in the **\(I-V\) diagram**).\\ 
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 +**When illuminated**, it generates additional electron-hole pairs within the crystal.\\
 +{{drawio>lab05:Fig-150_inverting_op-amp_photo_diode_function_principle.svg}}
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 +Photodiodes are often operated **in reverse bias**, **where** the charge carriers (electrons and holes) generated by the incident light cause an increased **reverse** current flow (**third quadrant** of the I-V diagram). The higher the light intensity, the greater the reverse current. **Forward bias operation** is also possible, where the photodiode behaves like a solar cell (**first quadrant** of the I-V diagram).
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 +**Applications include** remote controls (IR range), galvanic isolation (optocouplers), light measurement, positioning, and light barriers.\\
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 +{{drawio>lab05:Fig-160_inverting_op-amp_photo_diode_i_v_diagramm.svg}}\\
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 +<imgcaption Fig-160_inverting_op-amp_photo_diode_i_v_diagramm | Inverting Op-Amp: Operating principle of a photodiode> </imgcaption>\\
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 <imgcaption Fig-110_inverting_op-amp_photo_diode_diagramms | Inverting Op-Amp: Diagramms of BPW 34 S> </imgcaption>\\ <imgcaption Fig-110_inverting_op-amp_photo_diode_diagramms | Inverting Op-Amp: Diagramms of BPW 34 S> </imgcaption>\\
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 Take a resistor from the E6 series that is as close as possible to the calculated value.\\ Take a resistor from the E6 series that is as close as possible to the calculated value.\\
 Also enter the values for $I_{\rm 1}$, $I_{\rm 2}$, $U_{\rm 2}$ and $U_{\rm OUT}$.\\ Also enter the values for $I_{\rm 1}$, $I_{\rm 2}$, $U_{\rm 2}$ and $U_{\rm OUT}$.\\
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