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

[didibabawu]

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!

 

[dselec]

Attachment 74035...checkout the attach ment u posted from your own post first...what is this device ?

 

[didibabawu]

It's OK now. Thank you!

 

[godfreyl]

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? :???:

 

[didibabawu]

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

 

[godfreyl]

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 ----------

 

[didibabawu]

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 ----------

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

 

[dselec]

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

 

[didibabawu]

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

Suppose all the transistors are in satuation region.