LTspice output impedance current drive amplifier

[pushpullé]

Hello everyone,

I'm currently striving to plot the output impedance of my amplifier on LTspice, assembled with a current drive or mixed mode feedback configuration.

I've tried Elliot's method here : https://sound-au.com/articles/current-drive.htm#s5 but it doesn't seems to work for me on my design, my amp becoming unstable when unloaded.

Any further ideas ?

 

[Elvee]

Replace the load with an AC1 source and plot 1V/Iout. You could use a second AC1 source connected to GND and plot its Vout/Iout. Post the .asc if you want an example/more details