ADA4857 SPICE Simulation Output Impedance

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!

Parents Reply Children
No Data