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The ADA4961 is designed to be AC coupled, and it's gain increases below 10 MHz.  For applications that need flat frequency response near or below 10 MHz, it'll be better to use completely dc-coupled, low-distortion differential amplifiers…

Hi, Huang,

    The ADA4961 is designed to be AC coupled, and it's gain increases below 10 MHz.  For applications that need flat frequency response near or below 10 MHz, it'll be better to use completely dc-coupled, low-distortion differential amplifiers…

Hi, STLCards,

   It's not clear what is the nature of RFA & RFB.  If they represent single-ended I & Q channel signals, then each can be connected to one ADL5565 (or use one channel out of the dual-channelled ADL5566 or ADL5567) to perform single…

Hi Malcolm,

Yes you can always match the CM voltage on the positive input of the ADC to DC couple a single ended signal. The negative input of the ADC needs a 0.1uF to ground. You might also need termination on the positive input to match the plus production…

Hello,

I would look into using one of our ADI Driver amps that can provide some additional gain while providing the output bandwidth required to maintain 400 MHz.   I attached links to two candidates as well as an application note.

Since the AD6655 does…