Im studying realimentation in electronic circuits, I know that for have transconductance gain the circuit have to be of serie-serie type....I have V in the entry and I in the out of it. To have a transfer function of it I divided in two parts: A=>the amp-op and the part of diodes and transistors and 2) Beta=>the two Resistances of 1kohm. This way I think I can calculate the transfer function of the circuit to a form A/(1+Beta*A) In the diodes and transistor part the gain it