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Folded Cascode with Gain Boosting - Input common mode range

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gaurav1712

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Hi all,

I am designing a folded cascode OTA with gain boosting. I am trying to figure out the right topology for gain bost aplifier. I came across the paper from Bult 91 where he mention that it is necessary to have a additional stage with "input common mode range close to the supply voltage".

Then he goes on to suggest using folded cascode as the gain boosting amplifier. But I cannot figure out what he means by input common range and how does folded cascode help in that.

Any help will be great!

THaks,
Gaurav

PS - I have attached the paper I am talking about. (Pg 8)
 

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