strahd_von_zarovich
Advanced Member level 4
Hi,
I am trying to measure dark current noise of a photodetector using transimpedance amplifier. I have read lots of whitepapers, but I couldn't find any information about how photodetectors dark current noise affect the measerement system. Does it contributes directly to opamp current noise ?(For example if In of an opamp is 0.1pA/Sq(Hz) and photodetector's In is 0.1pA/Sq(Hz), do I have to add them together to get 0.2pA/Sq(Hz) or do I have to calculate it by using the noise formula : Sq(In^2 + In^2)
If my feedback resistor is 10^7 ohm, then what is the total noise contribution from the opamp and photodetector current noise ?
Thanks in advance.
I am trying to measure dark current noise of a photodetector using transimpedance amplifier. I have read lots of whitepapers, but I couldn't find any information about how photodetectors dark current noise affect the measerement system. Does it contributes directly to opamp current noise ?(For example if In of an opamp is 0.1pA/Sq(Hz) and photodetector's In is 0.1pA/Sq(Hz), do I have to add them together to get 0.2pA/Sq(Hz) or do I have to calculate it by using the noise formula : Sq(In^2 + In^2)
If my feedback resistor is 10^7 ohm, then what is the total noise contribution from the opamp and photodetector current noise ?
Thanks in advance.
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