Looks ok to me, beside maybe the the input pair could use
some resizing for lower offset
It seems that your input pair
is close to moderate/stron inversion which is ok for high bandwidth
differential pairs. However you could place it in weak inversion for
lowest offset.
Is the cap at the output mainly used for compensation or does it
work as a load model ? If it's load, theres not much you can do
If it's used for compensation you could try to trade between R and
C or use some different compensation scheme
However, if your circuit meets the specs, electrical and physical (area)
don't bother and go on. If you need the cap, you need it.
I almost forgot ... the 1u of the p-Fet driver is the length right ?
Why don't you reduce the devicelength a bit ? (if reliability vds is still ok)
Thereby you could reduce width as well and reduce the cap-load for
the input stage, therefore you save area, gain speed and maybe
you could also reduce the output cap cause usually the output driver
has a significant impact on the stability. Less cap here usually shifts the
output pole and improves stability ...
Best Regards
Andi