Other Parts Discussed in Thread: OPA657
The datasheet for OPA818 show that its input current noise strongly depends on frequency. Could you please clarify how to include the frequency dependence into the calculation of the total output noise?
Could you please also explain the origin of the frequency dependence of the input current noise?
Could it be caused by the input voltage noise driving a current though the input capacitance? If so, does one still have to add the noise term caused by the input voltage noise multiplied by the frequency dependent noise gain?
Why does input current noise of OPA18 have frequency dependence while input current noise of OPA657 does not when they are both high bandwidth JFET input op amps?