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op-amp gain problem ?

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farshadr

farshadr

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hi
what name is this opamp ?
i need to calculate Gain and Rout and Rin of circuit.
please help me, this is emergency.
so thanx
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**broken link removed**
 

Hi,

I don't know its name, but is a basic topology with two stages of gain.

Gain = (gm1gm6/gm3)(ro6||ro8)

Rin = inf.

Rout = ro6||ro8

If you need a more extended explanation about how I obtained these results, you can ask me again.

PD: I assume gm1=gm2 and gm5~8 are equal.

Best Regards.
 
Last edited:

I would like to correct the gain equation:
Gain=gm1.(ro6||ro8)
 

That is a "miller ota".
 

The correct DC gain of this OTA is:
(gm5/gm3)gm1(ro6||ro8)

I guess leo_o2 assumed gm5=gm3 but this does not have to be
 

Yes. I supposed gm5=gm3.
dgnani is correct.
And it is one gain stage OTA.
 

Yes I made a mistake, sorry!, but I edited the post and fixed the error.
Thanks for the observation.
 

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