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Difference between gm cell and conventional opamp

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Analogworld

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Hi All,

What is the difference between the transconductance amplifier (gm cell) and the convetional operational amplifier (opamp)?
 

Hi

Opamps usually have output stage (Class A or Class AB) in order to have low output impedance. Even if an opamp doesn’t have an output stage, since it has a high gain and it is always used in a feedback loop, the output impedance of the opamp is low.
But this is not the case for a transconductor (Gm) cell, as it is used often in an open-loop structure.
Another difference is that the gm of an opamp is not necessarily very linear, while the gm of a transconductor should be very linear.
These are two major differences.

OpAmp
 
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