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ADA4857 SPICE Simulation Output Impedance

Question asked by ProtonTim on Aug 18, 2016
Latest reply on Nov 20, 2016 by JinoL

I am running a SPICE simulation (in Altium Designer) using the supplied model for the ADA4857.  If I load the output of the amplifier with anything less than 1Meg or so the output sags very significantly - but I get reasonable performance with a 1Meg load.  In the data sheet it mentions performance into a 1K load.  I am down 20dB when I drive a 1K load.  I have checked and double checked my connections and everything looks correct.  Suggestions of what might be wrong or how to go about troubleshooting this issue would be most welcome. Thanks!

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