Toru Fujinami
Newbie level 3
Hi,
I have a question about output impedance of the opamp.
In basic circuit theory class, we say that output impedance of the opamp is very small so that output voltage does not drop within opamp itself.
However in transistor level OPAMP design class, we learn that gain of the Opamp is typically Gm*Ro where Gm is transconductance and Ro is the impedance looking into output. To get a high gain, we want to increase Ro.
Aren't these two statements contradicting each other?
Thank you
I have a question about output impedance of the opamp.
In basic circuit theory class, we say that output impedance of the opamp is very small so that output voltage does not drop within opamp itself.
However in transistor level OPAMP design class, we learn that gain of the Opamp is typically Gm*Ro where Gm is transconductance and Ro is the impedance looking into output. To get a high gain, we want to increase Ro.
Aren't these two statements contradicting each other?
Thank you