How can I add a low pass filter to a design using a current feedback, fully differential amplifier such as the ADA4927?
The bandwidth should be 50-100 MHz.
All suggestions with 1-3 poles are interesting. (And if you have design equations for Butterworth or Inverse Chebyshev I would be really really happy).
None of the OP-amp filter topologies I have found can be used with this amplifier, either because it has current feedback or because it is fully differential.
I my application, the most important characteristic is linearity, i.e. I need low harmonic distortion and low intermodulation distortion. But if there is now way to add a low pass filter to the ADA4927 I may switch to ADA4938 which has higher harmonic distortion, but has voltage feedback and thereby allow capacitors in the feedback.