OPAMP Stability Simulation

Hi WangJerry1 ,

Upload your files if possible.

There are a few docs about bode analysis via LTspice:

AC analysis for linear circuits (like yours): https://www.analog.com/en/resources/media-center/videos/series/ltspice-ac-noise-analysis-tutorial.html

For nonlinear circuits:  How to Generate a Bode Plot for an SMPS in LTspice 

mike

Hi  Mike,

I used below two methods to simulate the OPAMP stability.

But the bode figures of simulation result are different.

Q1: Which method is more suitable for OPAMP simulation?

Q2: Which bode figure does we use for checking the phase margin:
       Bode_figure_1: V(fb)/V(inm)
       Bode_figure_2: V(AUDIO_F_MIX)

Below is project file.

OPAMP_Stability.zip

Best Regards!

Jerry

Hi  Mike,

Could you check above questions?

Best Regards!
Jerry

Hello,

Same resultat as method n°1 with transcient analysis and FRA.

OPAMP_Stability_1_FRA.asc