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LM25149-Q1: How big can Cinj be for AEF?

Part Number: LM25149-Q1

Hello,


I'm trying to switch at a slower frequency with high attenuation. After using equations #26 in the data sheet, I was noticing that the capacitance values can get pretty high . Is there an upper limit on how big I can make Cinj and have the AEF work correctly? 

  • High Robert,

    CINJ can be any size, but I would say 1 or 2.2uF would be the practical upper limit, anything more would be diminishing returns.

    The damping resistor or amplifier output impedance will likely dominate the overall AEF branch impedance, so reducing the capacitive impedance would not do much.

    Hope this helps,

    -Orlando