Analog Design Engineer

[karsantosh]

Intuitive understanding that high impedance nodes are difficult to bias.
Need for CMFB

 

[crutschow]

Intuitive understanding that high impedance nodes are difficult to bias.
Need for CMFB

Not enough info to give you an informed answer.
What exactly, are you trying to bias?

 

[dick_freebird]

What do you mean by "difficult"? A high-Z node is real
easy to boss around.

 

[karsantosh]

Not enough info to give you an informed answer.
What exactly, are you trying to bias?

I read somewhere that it is difficult to set the bias point for high impedance nodes and that's why we need CMFB. Would like to understand this intuitively. I understand the concept of 2 fighting current sources, but was wondering if there's more to the bias point of high impedance nodes

 

[barry]

It’s unclear what you’re saying or trying to do here. For one thing, nobody can help you “intuitively” understand something. That contradicts the whole idea of intuition.