Hi,

I am trying to simulate the AC response of the ada4940 in order to plot its Open-Loop Gain and Phase vs Frequency. I've tried to validate my simulation by plotting the open-loop gain of a simple circuit with a gain = 1 to then compare the results with the figure 42 of the datasheet.

I haven't been able to obtain the same graph as given in the datasheet and I was wondering if the spice macro-model supports open loop gain and phase vs Frequency or if there is something wrong with my schematics?

Here are the two Schematics that I have simulated with LTSpice:

Here is the Open-Loop Gain and Phase vs. Frequency graph:

I have attached my .asc files.

Thank you!

Hi Jonathan,

Inorder for you to get the OPEN-LOOP response plot, the formula should be:

(VOUT+ - VOUT-)/(VIN+ - VIN-). Then you will this graph as a result.

Regards,

Jino