I am trying to simulate on ltspice a circuit to separate common mode and differential EMI noise. The circuit is an active one that uses Analog op amps.
We have and input buffer (A1 − A3, Analog Devices AD8000), a difference amplifier (A4 − A6, Analog Devices AD8099), and the buffer A7 (Analog Devices ADA4817). The CM and DM are modeled by an equivalent three phase source that comprise both CM and DM noise.
The circuit works fine on ltspice if I use ideal op amps. But when I use the spice models of the op amps that I downloaded from Analog's website I have a problem with the AD8099. Because it has a high oscillation on the output if I connect the recommended compensation network on the datasheet , I think the problem is in the compensation network. I dont have the oscillation if i use higher value of capacitances connected the compensation pin.
I attach the ltspice model.