Many thanks.
I've already designed a FD-amp. The output signals swing between ca. -1.7 V and 1.7 V with an OCM of 0 V.
Now, with a designed CMFB, i am trying to set OCM at 0.8 V. In this case, vout should swing betwenn 0 V and ca.1.7 V, but unfortunately, it oszillates. Should I use frequncy compensation techniqe?
It seems i did something wrong!
First, i increase the signal swing betwenn 1.7 V and -1.7 V with FD-Amp, after that i decrease the signal swing between 0V and 1.7 V using CMFB!!!
For any comments, i would be thankful.