Hello,
First post here.
I am trying to figure out how to derive the transfer function of a difference amplifier when differential gain, common mode gain, and feedforward are used in the model.
I have attached two PDF's one with my sloppy work trying to figure out how it was done in "On the Measurement of CMRR."
The equation in question is equation 12 (just below figure 8) on pg. 4. It is referencing figure 7, a standard difference amplifier configuration, on pg. 3.
I am totally lost as to where these terms are coming from. It seems like Superposition, but I do not understand how each term is derived  especially the term that is multiplied by A(d).
This is not homework and I do not need a full solution; I am looking for insight on where to begin.
This is for a test bench that will eventually be put into an Excel or LabView program.
I could simply copy the equation, but what fun is in that?
First post here.
I am trying to figure out how to derive the transfer function of a difference amplifier when differential gain, common mode gain, and feedforward are used in the model.
I have attached two PDF's one with my sloppy work trying to figure out how it was done in "On the Measurement of CMRR."
The equation in question is equation 12 (just below figure 8) on pg. 4. It is referencing figure 7, a standard difference amplifier configuration, on pg. 3.
I am totally lost as to where these terms are coming from. It seems like Superposition, but I do not understand how each term is derived  especially the term that is multiplied by A(d).
This is not homework and I do not need a full solution; I am looking for insight on where to begin.
This is for a test bench that will eventually be put into an Excel or LabView program.
I could simply copy the equation, but what fun is in that?
Attachments

891.9 KB Views: 42

471.8 KB Views: 30