Why am I getting a positive phase shift

[godfrey]

Seems to me there's a nice option with Allison-biased Mosfets.

If you you drive the Allison at the emitters and use bootstrapped current sources, then you can get close to rail-to-rail output voltage swing because the gates can be driven beyond the supply rail voltages.

 

[godfrey]

To get close to rail-to-rail output swing in class B, one could perhaps use something like this?

 

[keantoken]

All this depends of what Sig wants.

In your Allison thread, the image in the first post won't expand , so it's hard to see what's going on.

I attached a zip file holding the schematic and files for that experiment at the bottom, if you can use LTSpice. I'll look for the image.

- keantoken