Ask about the "official name" of a circuit connection in folded-cascode op-amp

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Ask about the "official name" of a circuit connection in folded-cascode op-amp

Hi All, this picture shows a typical configuration of folded-cascode op-amp structure. Would anyone tell me what is the "official name" of this circuit?

At the mean time, I found using this structure may let some of the transistors, like M1 and M2, going into triode region in a wide temperature operation. Can it be treated as a design challenge by using this connection?
Thank you for your help!
 

Re: Ask about the "official name" of a circuit connection in folded-cascode op-amp

I don't know of an official name, but would rather call it a headroom saver, s. e.g. this excerpt from the Razavi book:
 

Re: Ask about the "official name" of a circuit connection in folded-cascode op-amp

"Wide Swing Folded Cascode" ...?!
 

Re: Ask about the "official name" of a circuit connection in folded-cascode op-amp

Wide swing cascoded current mirror is the term I've been familiar with. It's not really part of the folded cascode used by the OTA.
 

Re: Ask about the "official name" of a circuit connection in folded-cascode op-amp

mtwieg said:
Wide swing cascoded current mirror is the term I've been familiar with. It's not really part of the folded cascode used by the OTA.
Click to expand...

Yes, the circuit is effectively just a folded cascode using a wide swing cascoded current mirror.
 

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