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Summing amp with modulation problem

I am trying to simulate a siple circuit with 2 modulated signals going into a summing amplifier in multisim. However, as soon as I put in the op ap the output voltage increases up to the rail voltage. Before adding the opamp the signals seem to be adding correctly after modulation. Thanks!

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Hi,


It is better if you post the Multisim file instead of the screen shot.  The Multisim file has information that does not appear on screen shot.

Tien P.

National Instruments
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