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My simple napkin calculations in matlab give a result to within about 30% of what I'm measuring on the oscilloscope in terms of signal and noise magnitude. What the hell is going on here? I double checked all my numbers and schematics in the software and everything appears to be correct. The only thing I can think of is that the spice models for the amplifier components are wrong but I took those directly from the manufacturer (Analog Devices). Are spice based software packages always this off or am I doing something wrong?