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Which one is better to be the output stage of a two stage amplifier.

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didibabawu

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The circuit is used in a high speed sample hold circuit. The output swing for both circuit is enough.
So can any one tell me which one is better, the right or the left? Why?
3X!
output stage.png
 
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Attachment 74035...checkout the attach ment u posted from your own post first...what is this device ?
 

Those are output stages? The one on the left looks like an input stage, but I suppose you could use it for output.

The one on the right.... I dunno. How does that one work? :???:
 

Suppose the dc operation point is ok and both circuit have cmfb.
 

OK, so you want balanced output like this? I didn't think that would be useful for a sample and hold circuit.

Anyway, I think both circuits can have the same speed. Implementation of cmfb will be different though, so a lot depends on the first stage.

---------- Post added at 08:08 ---------- Previous post was at 08:06 ----------

 
godfreyl said:
OK, so you want balanced output like this? I didn't think that would be useful for a sample and hold circuit.

Anyway, I think both circuits can have the same speed. Implementation of cmfb will be different though, so a lot depends on the first stage.

---------- Post added at 08:08 ---------- Previous post was at 08:06 ----------
Click to expand...

Thank you godfreyl, the pic was wrong and was modified.
 

With the limited info u give about vbn both circuits r the same although the left having -vbn allows u to get tri-state action
 

dselec said:
With the limited info u give about vbn both circuits r the same although the left having -vbn allows u to get tri-state action
Click to expand...

Suppose all the transistors are in satuation region.
 

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