Quote:hello sir,
please note that there is no voltage amplifier, every where you have current and some how you are making node impedance lower if you want to get voltage at that note.
OK. Terminology "opamp" confuses me since opamp by definition has low output impedance and, consequently, is a voltage amplifier
Quote:One more thing when you want to use feedforward stage o/p node should be high impedance.
Don't understand this statement. Impedance of the loading network is determined by the nature of a signal that you have at the output,i.e voltage or current.
Quote:Come to our point of discussion, FF stage inject some noise into o/p node, which gets converted into voltage now you can refer it to any where you want. Please check the attached file.
The calculation you do are correct. Also, I believe that FF stage adds additional noise especially if FF coefficient is large.