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Folded cascode amplifier is an op-amp or ota?

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student14

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Hi

I want to know is folded cascode amplifier an ota or opamp. Sometimes it is mentioned as ota oand sometimrs as op amp.
Ota is an op amp without buffer. But when we fabricate an ota chip we use a buffer in front of ota. It means this ota is always an opamp? Am I right please correct me if I am wrong
 

OTA vs Op Amp is all about the back end (output stage). Either
one could (but does not have to) use a folded cascode gain stage
for differential-to-single-ended gain section.

"Is a transmission a car or a truck?"
 

OTA vs Op Amp is all about the back end (output stage). Either
one could (but does not have to) use a folded cascode gain stage
for differential-to-single-ended gain section.

"Is a transmission a car or a truck?"

Cant'understand what you are trying to say. Can you please explain
 

Hi,

It just says:
* The difference between OTA and OPAMP is not the "folded cascode".
* The difference is the "output stage".

Klaus
 

Yes I know but while designing folded cascode ota we dont have a buffer stage. But when we fabricate chip it requires a buffer. Will this OTA become an opamp.
Whats the difference in the output stage. Is it the load difference?
 

Attached is the folded cascode. Is it an op-amp or ota? foldedcascode.png
 

But when we fabricate chip it requires a buffer.
No, why? Particularly not a buffer in front of the OTA block.

Attached is the folded cascode. Is it an op-amp or ota?
I believe, you have answered the question yourself. The input stage current is transferred to the output without a buffer. Definitely an OTA.
 

OTA vs Opamp depends on the output impedance.

OTA if it has high output impedance.

Opamp if it has low output impedance.

See attached.
 

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  • opampvsota.png
    opampvsota.png
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