I download the 1D623 from AD site and simule it with LT spice in transient.
about 10min wait it's still a 12% of simulation.
I don't know what I have to check to solve this.
is someone can help me on this please?
Can you attach here the image of your LTspice schematic/circuit?
yes of course.
here it is:
yes of course,
What amplifier is U3?