Junus2012
Advanced Member level 5
Hello
I have a basic question regarding complementary fully differential output like the one I have attached to this email, it is basically a modified version of the folded amplifier referred as recycled folded OTA, indeed my question is about the fully-differential scheme used in this circuit, as you can see , the circuit has two complementary output stage, in each, there is a mirror just like of the single-ended OTA, so I am not understanding if this circuit needs a common mode feedback circuit (CMFB) or not and why even need it.
I found the circuit from this link:
Also, I have made little research to see the original of this topology, and I found this US patent
I do appreciate your kind help
Thank you very much in advance
Best Regards
I have a basic question regarding complementary fully differential output like the one I have attached to this email, it is basically a modified version of the folded amplifier referred as recycled folded OTA, indeed my question is about the fully-differential scheme used in this circuit, as you can see , the circuit has two complementary output stage, in each, there is a mirror just like of the single-ended OTA, so I am not understanding if this circuit needs a common mode feedback circuit (CMFB) or not and why even need it.
I found the circuit from this link:
Also, I have made little research to see the original of this topology, and I found this US patent
US5146179A - Fully differential operational amplifier having frequency dependent impedance division - Google Patents
A fully differential operational amplifier includes first and second frequency dependent impedance dividers, preferably frequency dependent current dividers, each of which has an input, a noninverting output and an inverting output. A respective input is coupled to a differential input signal...
patents.google.com
I do appreciate your kind help
Thank you very much in advance
Best Regards