how to tell feed back & feed forward ?

[sj95]

Hi all:

how to tell feed back & feed forward circuit ?

I can't distinguish a circuit is back or forward when which vout and vin are connected by other component.

And about miller compensation in a two stage op, the miller capacitor is feed back or feed forward ?

Thanks.

 

[saikat36]

I don't think there are any feed forward ckt.
Feedback ckts are mainly 2 types----a)Positive feedback & b)Negative feedback.
As per as Miller Compensation ckt. This is a typical example of feedback ckt.

 

[FvM]

I don't think there are any feed forward ckt.

There are some applications of feedforward in analog design, it's e.g. used in OP compensation, when a slow amplifier stage ís bypassed at higher frequencies. Even miller compensation can turn into feedforward under certain circumstances.

 

[leo_o2]

Feedback means the behind signal will be feeded back into a front signal. However, feed-forward means the front signal will be feeded forward into a behind signal. A feed-forward example: a capacitor is paralleled with a upper resistor in a resistor divider.