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Input FET Amplifier Current Noise Source

Category: Datasheet/Specs
Product Number: ADA4350

In the datasheet of the ADA4350 it is stated that "The FET input amplifier has very low voltage noise and current noise making it an excellent choice to work with a wide range of photodetectors, sensors, or precision data acquisition systems."

Even if voltage and noise sources are considered small the datasheet provides only a value for the voltage noise source of the input FET Amplifier.

What about the equivalent noise source? Can this be considered zero, or it can be a few fA. Why it is not specified in the datasheet? Can be ignored in the calculations of the RTI,TRO noise?

Thank you.



Syntax error fix
[edited by: elsiesemico at 8:17 AM (GMT -5) on 17 Jan 2024]

Thread Notes

  • Hi  ,

    The datasheet only specified current noise referred to P1

    Since you mentioned the FET input amp, I assume that you are asking regarding the current noise of the FET amp. From the datasheet it was mentioned that the current noise is negligible since the input voltage noise of the amplifier and noise due to resistor RF are more dominant. Let me know if I interpreted your question correctly.

    Best regards,

    Gio